Autel MaxiCOM MK900 Bidirectional Diagnostic Scanner

The MK900 is Autel's step above the MK808S-tier scanners: an 8-inch Android 11 tablet built around bidirectional control and the newer CAN-FD and DOIP protocols that 2020-and-later vehicles increasingly require to talk to the gateway module at all. On a transmission that's slipping, flaring, or stuck in limp mode, that matters because you need the TCM to actually respond to bidirectional commands, not just dump a code list.

It runs 3,000-plus active tests out of the box, so you can command shift solenoids, the TCC solenoid, cooling fans and other actuators directly to isolate a bad solenoid or a wiring fault from a mechanical valve-body problem before anything comes apart. AutoVIN and AutoScan 2.0 pull the vehicle's VIN, year, make and model automatically and scan every module in one pass, so you get a pre- and post-repair report without typing in plate or VIN data by hand. It covers 40-plus service functions (oil reset, ABS bleed, steering angle calibration, battery registration, TPMS relearn, and more), full FCA and Renault SGW gateway access for late Chrysler/Dodge/Jeep/Ram and Renault vehicles, and supports an optional endoscope accessory for inspecting hard-to-reach areas without disassembly.

Coverage runs 150-plus makes on 1996-and-newer OBDII vehicles. The 8-inch 1024x600 screen is noticeably easier to read live data graphs on than the 7-inch MK808S, and the menu is available in 21-plus languages. As with other Autel units, the first year of software updates is included; after that, new-model coverage requires an annual subscription, though the tool keeps functioning on its existing vehicle library without it.