OBD Codes

OBD codes help identify the likely source of a fault detected by a car’s onboard diagnostic system. Whether it’s a check engine light, an ignition issue, an emissions fault, or a faulty sensor, these codes provide a useful first clue before delving deeper into the diagnosis.

In this AutoMania file, find our guides dedicated to the most common OBD codes, their meanings, associated symptoms, and checks to perform. You will also find explanations on the structure of fault codes, the difference between generic codes and manufacturer codes, as well as tips to better understand what your car is trying to signal.