The most complete open-source diagnostic trouble code database for OBD-II applications. Features both generic SAE J2012 standard codes and manufacturer-specific definitions for accurate vehicle ...

For many car owners, the dreaded check engine light indicator on their car’s dashboard is not just about discovering that something is amiss with their car’s engine but is also a harbinger that a ...

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 ...

In the Last diagnostics article, we outlined how to retrieve and decipher engine diagnostics for engines running OBD-I engine management computers. OBD or On Board Diagnostics is a subsystem of the ...

I was recently at a seminar going over some diagnostics for some of the problematic and reoccurring fault codes. The general discussion led us in an interesting direction about the nature of fault ...

If you've ever gone to a mechanic for a check engine light problem on your car, then chances are you've heard the technician say something about an OBD scanner. It's a handheld phone-like device that ...