Automotive Diagnostic Scanners & Scan Tools

The three tiers of scan tool

Nearly every scanner falls into one of three groups, and the gap between them is capability, not screen size. Basic code readers pull and clear engine fault codes and check readiness for an emissions test. All-systems tablets read every module on the vehicle, not just the engine, and run the service functions a shop uses daily: oil resets, electronic parking brakes, steering angle, battery registration. Bidirectional tools add the ability to command components directly, so you can fire an injector or cycle an ABS pump to confirm a fault instead of guessing, and the top tier adds ECU coding and programming. Buy for the work you actually do: a code reader will not get you through a drivability diagnosis, and a programming tablet is wasted money if you only read codes.

What to check before you buy

Four things decide whether a scanner will still be useful in three years.

Vehicle coverage

Coverage varies by make, model year and system. A tool that reads engine codes on everything may only do ABS and airbag on some makes. Check coverage for the vehicles you actually work on, not the headline count.

Software updates

Diagnostics ages faster than any other tool category. Most scanners include a period of free updates then charge to renew. The tool keeps working when updates lapse, but it stops supporting newer vehicles, so treat renewal as a running cost.

CAN-FD and DoIP

These are the newer communication protocols on late-model vehicles. A scanner without them will not talk to a growing share of cars regardless of how good it is otherwise. If you work on anything recent, this is not optional.

Bidirectional control

If you diagnose rather than just read codes, this is the feature worth paying for. See the bidirectional and pro tablets for the tools that support active testing.

Specialist diagnostics beyond the scanner

A scan tool points you at the system; other tools find the fault. Val stocks TPMS tools for sensor programming and relearns, key programmers for immobilizer work, battery testers and chargers for charging-system diagnosis, smoke and leak detection for vacuum and EVAP faults, and thermal cameras for tracing electrical and cooling problems. Browse the full diagnostic tools range to fill the gaps.