Once upon a time, you could diagnose the culprit of your Mazda MX-5 Miata's check engine light with a paperclip. We now use ...

With native J2534 pass-thru and topology mapping, Topdon's new OBD2 scanner line offers a lot of high-tier functionality for the price.

OBD2 scanners use a system whereby onboard computers in cars and trucks conduct self-diagnostics and reporting of their computer boards. The best part of owning an OBD2 reader is that it’s essentially ...

This article was updated in November 2025 with new information. You know you’ve earned your DIY stripes when you can stay calm the moment something goes wrong. And with cars, that moment usually ...

Almost all cars made after 1996 have an OBD2 diagnostic port for plugging into and reading trouble codes when a “check engine” light comes on. But some vehicles, particularly German ones made after ...