The MK808S, MP808S, and MX900 sit next to each other in Autel’s consumer/prosumer lineup, and it is easy to assume the price gap alone tells you which is “best.” It doesn’t. Each one is built around a different priority: the MK808S is a straightforward all-systems code reader, the MP808S is built around European-vehicle coding, and the MX900 is built around supporting the newest vehicle communication protocols.

All three are genuinely bi-directional scan tools, Autel’s own product pages confirm active-test / bi-directional control on each model. What actually separates them is coding scope, protocol support, and price.

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MK808S, MP808S and MX900: The Short Answer

Best Overall / Lowest Price of the Three: Autel MK808S.

Best for BMW, Porsche, or VW Coding: Autel MP808S.

Best for DoIP and CAN FD: Autel MX900.

SCG Overall Pick: For most buyers who don’t specifically need European coding or newest-protocol support, the MK808S covers the most ground per dollar. Buyers should let their actual need (coding vs. newest-vehicle protocol support) decide between the MP808S and MX900, not price alone.

Autel MK808S

The Autel MaxiCOM MK808S is the most affordable way into this Autel trio, delivering confirmed bi-directional Active Tests and a 28-plus service-function list on a 7-inch Android tablet without paying for coding or newest-protocol support you may not need yet. AutoVIN identification and Wi-Fi-based updates round out a genuinely well-documented, easy-to-compare entry point into Autel’s lineup. If your work is everyday diagnostics and resets rather than European coding or DoIP and CAN FD work, this is the one that covers the most ground per dollar.

Pros	Cons
Confirmed bi-directional Active Tests on Autel’s own page	ECU coding and DoIP/CAN FD support: not listed by Autel for this model
28+ service functions per Amazon; Autel names SAS, EPB and DPF
AutoVIN automatic vehicle identification
Entry point into a well-documented, directly comparable Autel lineup	TPMS support is limited to Autel's "Basic" tier
Wi-Fi connectivity (802.11a/b/g/n/ac) for wireless updates
5000mAh lithium-polymer battery

Autel MP808S

The Autel MaxiPRO MP808S is the only scanner of the three with documented ECU coding, confirmed directly on Autel’s own page for BMW, Porsche, and VW platforms, backed by the longest free-update window in the lineup at two years. Bidirectional control and the same 28-plus reset-function list carry over from the shared hardware platform, so you’re not trading away everyday diagnostics to get coding capability. If BMW, Porsche, or VW-group coding work is genuinely part of your job, this is the clear pick of the three.

Pros	Cons
Only model of the three with documented ECU coding (BMW/Porsche/VW)	DoIP/CAN FD support: not listed
Longest free-update window (2 years) of the three
Confirmed bi-directional control across named components
28+ named service functions
VAG-specific coding guidance for Audi, VW, and Skoda models	Coding scope is brand-specific (BMW, Porsche, VW), not general-purpose
1-year free warranty included alongside the 2-year update window

Autel MX900

The Autel MaxiCheck MX900 is built for the buyer who wants DoIP and CAN FD, which Amazon and Autel both list for it and neither sibling lists. It also carries the widest service-function list of the trio at 40-plus named functions, on the largest screen and battery in the lineup. If newest-vehicle protocol support is what you need, this is the one built for it, not a general upgrade over the other two.

Pros	Cons
Only model of the three with documented DoIP/CAN FD support	Larger, heavier unit than either sibling
Widest documented service-function list (40+) of the three
Largest screen (8″) and battery (7700mAh) in the lineup
DoIP and CAN FD listed by Amazon and Autel
8MP rear camera built in
USB Type-C connectivity alongside standard USB and Wi-Fi

Autel MK808S vs MP808S vs MX900 at a Glance

Specifications sourced from Autel’s own product pages (autel.com and store.autel.com) at the time of writing. Prices and specs change, so check the current Amazon listing before purchasing.

Three Wired Autel Tablets, Three Different Specialists

This page comes from our analysis of Autel’s product pages and manuals for the three tablets, the Amazon listings, our review of each model, and independent sources including the EPA’s diesel particulate filter bulletin, Bosch Diagnostics on the Fiat Chrysler Secure Gateway, and the federal electronic stability control standard. We ran all three tablets through the same list of real jobs on the same kinds of cars and asked the buyer’s question for each: which one do I put in my hands for this vehicle?

All three tablets are wired. Each plugs into the car through a main cable and takes power from the OBD II port, so there is nothing to pair and no wireless connector to charge. All three run Android 11 on a quad-core 1.8 GHz processor with 4 GB of RAM and 64 GB of storage. All three run bidirectional active tests. They are siblings in hardware and different in purpose. The MK808S is the generalist, the cheapest way into the family. The MP808S is the coding specialist, built around BMW, Porsche and VW. The MX900 is the protocol specialist, built around DoIP and CAN FD and the longest service list. The decision comes down to which specialty your cars need.

On price, the MK808S is typically the least expensive of the three, and the MP808S and MX900 sit above it. The gap between them is moderate, which is why the job you do should decide the purchase, not the price alone. Street prices move, so check Amazon before you buy.

MK808S, MP808S and MX900: Best Pick for DIY, Independent Shop and Best Bay

MK808S, MP808S and MX900: Older Cars vs Newer Cars, Which Tablet Wins by Model Year

1996 to 2007

All three cover 1996 and newer vehicles with AutoVIN and the standard protocols. On a 2004 Chevrolet Silverado, a 2006 Ford F-150 or a 2005 Toyota Camry, they do the same work: read and clear all systems, run active tests, oil reset, steering angle, EPB and ABS bleeding. Nothing on these cars needs coding or the newer protocols. Winner: MK808S, because it costs the least.

2008 to 2016

The CAN era. A 2012 BMW 328i, a 2014 Porsche Cayenne or a 2013 Volkswagen Jetta is the territory where the MP808S earns its premium, because those brands are the ones Autel names for coding and hidden-feature access. A 2014 Ford F-150 or a 2015 Chevrolet Malibu needs services only, and any of the three does them. Winner: MP808S for BMW, Porsche and VW, MK808S for everything else.

2017 to 2019

Fiat Chrysler vehicles from 2018 put a Secure Gateway in front of the modules. Bosch Diagnostics explains that the gateway is similar to a firewall, that it blocks clearing codes and all bidirectional functions, and that a technician unlocks them with a one-time AutoAuth account setup and tool registration. The MP808S and the MX900 list AutoAuth access (the MP808S for 2018 and newer per Autel, 2017 and newer per Amazon, and the MX900 for 2018 and newer). The MK808S’s Autel page does not name it; Amazon’s title mentions FCA and SGW. For a 2018 Jeep Wrangler, the MP808S or the MX900 is the safer tablet. Winner: MX900 or MP808S for FCA.

2019 and newer

DoIP and CAN FD are on the MX900’s list, and neither sibling lists them. A 2021 Chevrolet Silverado, a 2020 BMW 330i or a 2022 Volvo XC60 is an MX900 job. The MX900 is the only tablet of the three that gives the buyer a basis to expect full communication. Winner: MX900.

MK808S, MP808S and MX900: Make by Make, Which Tablet for Which Car

BMW and Mini

The MP808S lists ECU coding, confirmed on Autel’s page for BMW, Porsche and VW platforms, with the same coding features as the MS906 Pro, and hidden-feature access. It covers the changes owners ask for after a retrofit or a battery change. The MK808S and MX900 list no coding. All three handle battery registration, EPB service mode and oil resets, which are the services a BMW needs. The MX900 adds DoIP for F and G chassis cars. Winner: MP808S for coding, MX900 for a 2018 or newer BMW that needs a full scan.

Porsche

Autel names Porsche for coding on the MP808S. The other two list none. Winner: MP808S.

Volkswagen, Audi, Skoda and Seat

Autel names VW and Amazon lists VAG guided functions for the MP808S, with guidance for Audi, VW and Skoda models. The MK808S and MX900 handle diagnosis and services only. Winner: MP808S.

Mercedes-Benz

None of the three lists Mercedes coding, and none does Mercedes SCN coding, which needs a manufacturer online session. All three read the systems, run the active tests and perform the resets a Mercedes needs. Winner: MX900 for a 2018 or newer car, tie before that.

Ford and Lincoln

All three read Ford systems and handle oil, EPB, battery registration, SAS and ABS bleeding. None lists Ford coding or module programming. A Ford F-250 diesel needing a DPF regeneration points to the MK808S or MP808S, whose Autel pages name DPF. Winner: MK808S for the budget buyer, MP808S if you also work on European cars.

Chevrolet, GMC and Cadillac

For GM through 2018, all three work. From 2019, the MX900 lists CAN FD and the siblings do not. Winner: MX900 for newer, MK808S for older.

Chrysler, Dodge, Jeep and Ram

See the model-year section. The MP808S and the MX900 list AutoAuth, and the MK808S does not on Autel’s page. A Ram 2500 diesel from 2018 needs the gateway unlocked, and an MP808S or MX900 does it. Winner: MP808S or MX900.

Toyota, Lexus, Honda, Nissan, Hyundai and Kia

All three do the standard services on these makes. Winner: MK808S.

Volvo, Jaguar and Land Rover

These brands use DoIP on newer cars, and only the MX900 lists it. Winner: MX900.

MK808S, MP808S and MX900: Job by Job, Which Tablet for Which Repair

Notice how few rows decide the purchase: coding, newer protocols, the number of services, the update term and the price. For everything else, the three tablets are the same machine in a different case.

MK808S, MP808S and MX900: Eight Real Jobs, Start to Finish

Job 1: 2013 BMW 328i, owner wants start-stop memory off and a comfort setting changed

This is a coding job on a BMW. The MP808S lists coding for BMW and hidden-feature access. The MK808S and MX900 do not. Winner: MP808S.

Job 2: 2021 Chevrolet Silverado with a module fault

The truck needs a tablet that lists CAN FD. The MX900 does. The MK808S and MP808S do not. Winner: MX900.

Job 3: 2012 Ford F-250 6.7L diesel, forced DPF regeneration

The EPA explains that a DPF traps particulate matter and that the matter is reduced to ash during regeneration. Passive regeneration happens when exhaust temperatures are high enough without driver action; active regeneration may need driver action or another source of fuel or heat, and with an active filter it is important to follow the manufacturer’s instructions. A scan-tool DPF service starts a forced regeneration when the filter has loaded with soot. The MK808S and the MP808S name DPF; the MX900’s list does not. Winner: MK808S for the budget buyer, MP808S if you also code.

Job 4: 2018 Jeep Wrangler that will not clear a code

The Secure Gateway blocks code clearing and bidirectional functions until AutoAuth is set up and the tool is registered. The MP808S and MX900 list AutoAuth. Winner: MP808S or MX900.

Job 5: 2015 Honda Accord after an alignment

The steering angle sensor needs calibration. The federal standard on electronic stability control exists to reduce deaths and injuries in crashes where the driver loses directional control, and it requires the system to monitor the driver’s steering inputs, which is why a steering angle sensor that is out of calibration matters after steering work. Any of the three does the SAS calibration. Winner: MK808S, for the lowest price.

Job 6: 2014 Porsche Cayenne, hidden-feature activation

Autel names Porsche for coding on the MP808S. Winner: MP808S.

Job 7: 2019 Volvo XC60, full-system scan

Volvo uses DoIP from 2018. The MX900 lists it. Winner: MX900.

Job 8: 2010 Toyota Tundra, oil reset and brake service

All three do both. Winner: MK808S.

Tally: the MK808S wins three jobs, the MP808S wins two, the MX900 wins two, and Job 4 is shared. The result is a three-way split, which is the honest picture of a family built from three specialists.

Why All Three Are Wired, and What It Means

The three tablets connect to the car through a main cable that plugs into the tablet’s DB15 port and the car’s OBD II port. The tablet takes its power from the car while the cable is connected. There is no wireless connector to pair, no Bluetooth to drop and no connector battery to charge. For a bench or a lift, that is an advantage: the connection does not fail in the middle of a coding write. The cost is that you cannot walk around the car with the tablet out of cable range. If wireless matters to you, step up to a Bluetooth model such as the Autel MaxiCOM MK900-BT or the LAUNCH CRP919EBT. For the jobs on this page, cable is the safer link, and Launch says the same about coding on its own tablets.

Updates, Warranty and What Happens After the Free Period

The MP808S gives two free update years and a one-year warranty on Autel’s page; Amazon says a listing that shows only one year is upgraded automatically within five to seven days. The MX900 gives one free update year and a one-year warranty. The MK808S gives one free year per Amazon, with most features staying active after it expires. None of the three sources gives a renewal cost. Plan on paying for updates after the free period, and expect the tablet to keep working on the last software it received. For a buyer who plans to hold the tablet for four years, the MP808S’s second free year is a real advantage.

Where These Three Sit in Autel’s Lineup

• Autel MaxiCOM MK808Z: the Wi-Fi sibling of the MK808S, typically at a lower price. Compare it with the MK808S before you pay for the MaxiCheck badge.
• Autel MK808S: the generalist reviewed here.
• Autel MP808S: the coding specialist.
• Autel MX900: the protocol specialist, wired.
• Autel MaxiCheck MX900-TS: the same family with TPMS programming and a Bluetooth connector, and US-only.
• Autel MaxiCOM MK900-BT: the wireless tablet with CAN FD and DoIP.
• Autel MaxiSys MS906 Pro: the professional tablet whose coding features the MP808S shares for BMW, Porsche and VW.
• LAUNCH CRP919EBT: a rival wireless tablet with coding on named brands, CAN FD and DoIP.

MK808S, MP808S and MX900: Which One to Buy, Plain Answers

• You work on older cars and want the lowest price: MK808S.
• You own or work on BMW, Porsche or VW and want coding: MP808S.
• You work on 2019 and newer cars, or Volvo, Jaguar or Land Rover: MX900.
• You work on 2018 or newer Jeep or Ram: MP808S or MX900.
• You service diesel trucks: MK808S or MP808S.
• You want the longest service list: MX900.
• You want TPMS programming: none of the three; the MX900-TS.
• You want J2534 programming: none of the three; the LAUNCH PRO3S+ Elite.

Mistakes Buyers Make With These Three

Buying the MK808S or MX900 for BMW, Porsche or VW coding. Only the MP808S lists it.

Buying the MP808S for newer cars. It lists neither DoIP nor CAN FD.

Reading Amazon’s “same as MS906 PRO” language as a promise. Autel’s page describes the MP808S itself, with the same coding features as the MS906 Pro for BMW, Porsche and VW, and nothing beyond that.

Believing the Amazon active-test and brand counts. Amazon lists 3,000 or more tests and counts of 150 to 200 brands or 15,000 models. Autel’s pages give no such counts for these tablets. Both ways of counting can be true at once, because counting makes and counting models are different things. Do not decide on them.

Expecting the MX900 to code. Neither Amazon nor Autel lists ECU coding for it.

Forgetting the AutoAuth account. A 2018 or newer Jeep or Ram needs a one-time account and tool registration.

Ignoring the update clock. The MK808S and MX900 give one free year. The MP808S gives two.

MK808S, MP808S and MX900: A Seven-Day Acceptance Test

1. Day one: charge the tablet, connect to Wi-Fi, register and download the software.
2. Day two: connect to your own car, run a full-system scan and save the report.
3. Day three: run one active test and one reset you need.
4. Day four: run the job you bought it for, such as a coding change on the MP808S or a protocol check on the MX900.
5. Day five: connect to a second car of a different make.
6. Day six: check the update clock, the warranty date and the return window.
7. Day seven: decide, and use the return window if the main job did not work.

MK808S, MP808S and MX900: The Amazon Claims Versus Autel’s Own Pages

The MP808S in Practice: What Coding Means on a BMW, Porsche or VW

Coding on the MP808S is Autel’s own routine for named brands, not a manufacturer-software session. Amazon describes it as online and offline coding with personalization and hidden-function activation, plus VAG guided functions. Autel’s own page limits it to the same coding features as the MS906 Pro for BMW, Porsche and VW. On a car from one of those brands the technician opens the system, picks the coding function, chooses the feature and applies it on screen, with a charger on the car and the cable plugged in for the whole job. Typical requests are start-stop behavior, comfort lighting, lock beeps and seatbelt warning sounds on the cars that allow them. The list of options depends on the car, so the first step on any car is to open the system’s special function menu and see what it offers. Coding is not programming: it changes settings, and it does not write new software to a module. If your work involves flashing, you are looking at a J2534 tool.

What the MX900’s Protocol List Tells You

Autel’s MX900 protocol list names DoIP and CAN FD along with ISO 9141-2, ISO 14230-2, ISO 15765, SAE J1850 and several CAN types. That is the broadest list of the three, and it explains why the MX900 is the tablet for newer cars. DoIP sends diagnostic messages over Ethernet, used on recent BMW, Volvo, Jaguar and Land Rover, and CAN FD is a faster version of the CAN network used on recent GM and other cars. The MX900’s services list names oil, EPB, SAS, battery registration, throttle and ABS bleed, and its active tests include injector tests, headlamp and fuel pump control, A/C cycling, clutch engagement, oil pressure testing, vehicle level position calibration, brake vacuum pump operation and valve testing. It runs on an 8-inch 1280 by 800 screen with a 7,700 mAh battery that the manual rates at about seven hours of continuous use.

Extras Worth Knowing

Reports. All three save reports in Data Manager; the MX900 adds cloud report management, Pre and Post Scan and Wi-Fi printing, as Amazon and Autel name them. A pre-scan before the repair and a post-scan after it document what faults were there and prove none remain.

Inspection cameras. The MK808S and the MX900 are compatible with Autel’s videoscope accessories (the MV105S and MV108S), and the MX900 has an 8-megapixel rear camera with flash. A shop that wants to look inside a cylinder or behind a panel can add one.

Accessories. Amazon names battery diagnosis with the BT506 tester for the MX900-TS family, not for these three, so do not count on it here.

MK808S, MP808S and MX900: Fourteen Vehicles and the Tablet We Would Hand the Technician

Count the picks: the MK808S is the pick on five of the fourteen, the MP808S on four and the MX900 on four, with the Jeep shared between them. If your weekly cars look like the first half, save the money. If they look like the second half, the MX900 is the tablet.

MK808S, MP808S and MX900: The Bottom Line for This Trio

Do not choose among these three by price alone. Choose by the one capability your cars need. If it is coding on BMW, Porsche or VW, buy the MP808S. If it is DoIP and CAN FD, or the longest service list, buy the MX900. If it is none of those, buy the MK808S and keep the difference. And if what you really need is wireless, TPMS, J2534 or ADAS, none of the three is your tablet, and the lineup above points you to the right one.

Autel’s Naming Maze, Decoded

Buyers lose hours to Autel’s model names, so here is how the family is labeled, based on our reviews of each model. MaxiCOM (MK) is the family third-party sellers describe as the online-sold line, and MaxiCheck (MX) is the family they describe as sold through offline and retail channels, often with the same hardware under a different badge. MaxiPRO (MP) is the line the MP808S belongs to, aimed at coding on European brands. MaxiSys is the professional line, such as the MS906 Pro and the Ultra. The suffixes matter as well. BT means a Bluetooth connector, as on the MK900-BT. TS means tire service and a TPMS tool set, as on the MX808S-TS and the MX900-TS. Z and S mark siblings in the same hardware platform, as on the MK808Z and MK808S. When the names look alike on a listing, the safest habit is to read the specification, not the badge: the screen size, the battery capacity, whether the car connection is a cable or a Bluetooth connector, and which protocols and coding brands are named.

This is also why the price differences inside the family are not always about capability. Our review of the MX808S shows that it appears to share hardware with the cheaper MK808Z, sold under a different badge at a real premium. The three tablets on this page are different: they differ in their documented capabilities, not just their names.

The Service Functions Explained

All three tablets list service functions, and the names can sound abstract. Here is what each does, taken from the manuals of Autel and other tools in our reviews. Read it as a primer; the screens on your tablet will differ.

• Oil reset: reset the oil life to 100 percent after the oil change, after all the work is done, because an early reset can leave codes in the module.
• EPB service: retract an electric parking brake so the rear pads can be changed, then reapply it after the job.
• SAS calibration: teach the car the straight-ahead position of the steering. The wheels and steering wheel must be exactly straight when the calibration stores the position, and it is needed after steering parts, sensor replacement or a four-wheel alignment. The federal standard on electronic stability control explains why: the system must monitor the driver’s steering inputs, and a sensor that is out of calibration undermines it.
• Battery registration (BMS): tell the car a new battery was installed, so the charging system treats it correctly. A battery of a different type or capacity may need extra programming.
• ABS bleeding: used after replacing a brake pump, after severe fluid loss or after a brake fluid change, with the pedal pumped in a set order.
• Injector coding or reset: write the injector identification code into the ECU after an injector or the ECU is replaced. The MK808S names injector reset, and the MP808S and MX900 name injector coding.
• Throttle relearn: return the learned values stored in the ECU to the default state so the car controls the air intake accurately, usually after cleaning or replacing the throttle body.
• DPF regeneration: start a forced regeneration of a diesel particulate filter when the filter has loaded with soot. The EPA explains that a DPF traps particulate matter and that the trapped matter is reduced to ash during regeneration.

Two lessons come from the list. A reset is the last step of a repair, not a repair itself. And almost every one needs the right parts and the right order of work, so read the procedure for your car before you start.

Your First Hour With a Wired Autel Tablet

1. Charge and register. Charge the tablet, connect it to Wi-Fi and register it with Autel.
2. Update before the first job. Download the latest software. Do not skip this, because the tablet ships with older software.
3. Connect. Plug the main cable into the tablet’s DB15 port and the car’s OBD II port, which is usually under the dash on the driver’s side. The tablet takes its power from the car.
4. Identify the car. Use Auto Detect to read the VIN, Manual Input to type it, or scan it with the camera. Then choose Auto Scan for all systems or pick a single control unit.
5. Read before you clear. Before you erase codes, put the ignition ON with the engine off, save the report and read the codes again afterwards.
6. Save and print. Keep the report in Data Manager, and print or share it from the tablet.

On a 2018 or newer Jeep or Ram, set up the AutoAuth account before the customer arrives. On any car, put a charger on the battery before a coding or relearn job.

Three Households, Three Plans

The home mechanic with older trucks. He owns a 2008 Silverado and a 2011 F-150, does his own brakes and fluids, and wants an oil reset, a brake bleed and a steering angle calibration. The MK808S does all of it and costs the least. He buys it and does not look back.

The European specialist. She runs a small shop with BMW, Porsche and Volkswagen customers who ask for comfort coding. The MP808S lists exactly those brands for coding, with two free update years. She buys it, uses the cable for every coding job and adds a charger to every bay.

The mixed independent. His customers drive anything from a 2012 Camry to a 2021 Silverado to a 2019 Volvo. He needs a tablet that connects to the newest cars. The MX900 lists DoIP and CAN FD and has the biggest screen and battery. He buys it and keeps a cheaper tablet for the older cars.

A Decision Tree in Words

Answer these questions in order and stop at the first yes. Do your cars include a BMW, Porsche or VW that you want to code? Then buy the MP808S. Do your cars include 2019 or newer vehicles, or Volvo, Jaguar or Land Rover, that need DoIP or CAN FD? Then buy the MX900. Do you service diesel trucks that need a forced DPF regeneration? Then buy the MK808S or MP808S. Do your jobs involve only oil, brakes, batteries, steering angle and ABS bleeding on older cars? Then buy the MK808S. Do you need wireless, TPMS programming, J2534 or ADAS? Then none of these three is the tablet, and you should look at the Autel MK900-BT, the MX900-TS, the LAUNCH PRO3S+ Elite or a calibration system.

MK808S, MP808S and MX900: Three-Year Cost of Ownership

The purchase price is the smaller part of the cost over three years, and the update terms are the larger one. The MP808S includes two free update years, so its second year costs nothing. The MK808S and MX900 include one, after which Amazon says a yearly renewal fee applies and that existing functions keep working. None of the sources gives a renewal cost. Over three years, the MP808S has one paid-update year to the others’ two, which narrows its price gap against the MK808S. The MX900’s larger battery and screen do not change the cost, and the cable-only connection means there is no connector battery to replace. Expect the tablets to keep working on the last software they received if you decline a renewal. A shop that sees mostly cars at least five years old can let updates lapse for a year and lose very little. A shop that sees new models every week renews each year, on any of the three.

Ten Questions to Ask the Seller Before You Pay

Amazon listings for Autel tablets use titles that blur the line between models. Ask these ten questions, in writing, and keep the answers.

1. Is this the MK808S, MP808S or MX900 exactly, and not a bundle or a similarly named model?
2. How many free update years come with this specific unit, one or two?
3. Does the warranty term match Autel’s one-year warranty, and who honors it?
4. Is it the US version, and can it be registered and updated with a US account?
5. What is in the box: the main cable, the power adapter, the carrying case and the quick reference guide?
6. Does the unit carry the ECU coding features described for the MP808S, if coding is why I am buying it?
7. Does the unit list DoIP and CAN FD, if newer cars are why I am buying it?
8. Is the AutoAuth process supported for 2018 and newer FCA vehicles on this unit?
9. What is the return window, and who pays for the return?
10. What does the yearly renewal cost after the free period, and what stops working if I decline it?

A seller who answers the first six questions plainly is a seller you can buy from. A seller who answers with the listing title is not.

Bi-Directional Control: All Three Qualify, Autel’s Own Pages Confirm It

Autel’s own current product pages explicitly document active-test / bi-directional control for all three. The MK808S page states it can "perform bi-directional Active Tests." The MP808S page describes active-test control over components including solenoids, relays, switches, valves, sunroof, window, and door. The MX900 page describes "Full Bi-Directional Control/Active Tests" with 3000+ active tests, including injector tests, headlamp/fuel pump control, A/C cycling, and clutch engagement.

SCG Verdict: Bi-directional control is not a differentiator between these three: all of them have it, per Autel’s own documentation. Don’t choose based on this feature; choose based on coding scope and protocol support instead.

ECU Coding: The MP808S Is the Only One Built for It

This is the real reason the MP808S costs more than the other two despite being the “middle” model chronologically. Autel’s own MP808S page specifically documents ECU coding and hidden-feature access for BMW, Porsche, and VW, not generic “ECU coding” across all brands, but a specific European-marque coding capability neither the MK808S nor the MX900 documents.

SCG Verdict: If you specifically own or work on BMW, Porsche, or VW vehicles and need coding/hidden-feature access, the MP808S is the pick here regardless of the MX900’s lower price.

Newest Vehicle Protocols: The MX900’s Real Advantage

The MX900’s documented DoIP and CAN FD protocol support is the feature that actually justifies its “newer model” position in Autel’s lineup. Newer cars increasingly need them, and our DoIP and CAN FD explainers say why. Neither the MK808S nor the MP808S documents this support on their current Autel product pages.

SCG Verdict: If your work regularly includes newer cars that need DoIP or CAN FD, the MX900’s protocol support matters more than the MP808S’s European coding or the MK808S’s lower price.

Price and Value: The MK808S Covers the Most Ground Per Dollar

Autel does not list a price on the MK808S’s own product page, but it is commonly the least expensive of the three at third-party retailers. For a buyer who doesn’t specifically need BMW/Porsche/VW coding or DoIP and CAN FD support, the MK808S’s 28+ service functions and confirmed bi-directional control cover the same core ground as the other two at a lower cost.

SCG Verdict: MK808S for buyers without a specific coding or newest-protocol requirement.

Service and Reset Coverage: MX900 Documents the Most Functions

Autel’s MX900 page documents 40+ service and maintenance functions (including Electronic Parking Brake reset and Steering Angle Sensor reset), more than the 28+ documented for the MK808S. The MP808S documents a similar 28–30+ reset function count to the MK808S, with its coding functions layered on top.

SCG Verdict: If broad service-reset coverage matters more to you than coding or protocol support specifically, the MX900’s documented function count is the widest of the three.

MK808S, MP808S and MX900: Our Final Verdict

These three tools don’t compete for the same buyer as directly as their shared price bracket suggests. The MK808S is the generalist: confirmed bi-directional control and broad brand coverage at the lowest price of the three, with no specific coding or newest-protocol claim. The MP808S is the specialist for BMW/Porsche/VW coding work, and its price reflects that narrow but real capability. The MX900 is the specialist for shops that need documented DoIP/CAN FD support for newer cars, plus the widest documented service-function list.

Choose the MK808S if you want an all-systems, bi-directional reader without a specific coding or newest-protocol need. Choose the MP808S if BMW, Porsche, or VW coding is part of your actual work. Choose the MX900 if you need DoIP and CAN FD, or want the broadest documented service-reset list of the three.

MK808S, MP808S and MX900: Five Questions to Answer Before You Pay

1. Is your newest car a 2019 or later? If yes, the MX900 is the answer, because DoIP and CAN FD are on its list and on neither sibling’s. If your newest car is older, the other two are cheaper and do the same work.

2. Do you own a BMW, a Porsche or a Volkswagen that you want to code? If yes, the MP808S is the answer. Autel confirms coding for those brands on its page, and the MP808S is the only one of the three with coding listed.

3. Do you work on a 2018 or newer Jeep, Dodge or Ram? If yes, the MP808S or the MX900 is the answer, because their Autel pages list AutoAuth access. The MK808S page does not name it, although Amazon’s title mentions FCA and SGW.

4. Do you work on diesel trucks? If yes, the MK808S or the MP808S is the answer, because both name DPF regeneration, and the MX900 list does not name it.

5. Do you just want the cheapest bidirectional Autel? The MK808S is the answer. It does the common services for the least money, and the gap to the other two is moderate, which is why the first four questions should come first.

Run the questions in order. All three tablets are wired, run Android 11 and carry bidirectional tests, so the choice is never about the basics. It is about one specialty, and the question that matches your cars names the tablet.

Frequently Asked Questions

MK808S, MP808S and MX900: Bottom Line

Don’t pick between these three by price alone. All three are confirmed bi-directional scan tools per Autel’s own documentation, so that’s not the deciding factor. The real decision is: do you need BMW/Porsche/VW coding (MP808S), do you need DoIP and CAN FD (MX900), or do you just need a solid all-systems reader without either specialty (MK808S)?

Editorial Note

This comparison was developed through Autel’s own current product documentation and comparative analysis, current as of the time of writing.