A car repair resource site that helps you diagnose vehicle OBD, OBD-II, and OBD2 problems. We have many articles on how to diagnose and repair many check engine light codes.

OBD-II (Check Engine Light) Trouble Codes Welcome to OBD-Codes.com, your headquarters for everything OBD-II related. For more information on what OBD codes are, OBD-II codes explained, …

Get definitions and auto repair information for thousands of OBD-II codes. Look up B, C, U and P codes to diagnose your car problem.

FAQ: OBD2 Codes Explained OBD-II codes consist of a number of parts. Here is a sample OBD2 code: P0171 Here is a breakdown of what each digit of the code means: First Character - System The first …

How to read the codes 1. Ground terminals A and B (see diagram below) with the ignition "ON" and engine not running. The system will enter the diagnostic mode. In this mode, the computer will …

Search OBD-Codes.com We have literally hundreds of trouble code articles and thousands of discussions in the forums. This search here is the best way to search all of our content to get the …

Information on methods to reset the check engine light or OBD-II codes.

How to quickly diagnose, repair, and info on symptoms and causes of a P0102 MAF mass airflow code which indicates a low condition in the MAF circuit.

Engine codes P0135 (HO2S Performance Bank 1 Sensor 1) and P0030 (HO2S Heater circuit Bank 1 Sensor 1). I replaced the upstream oxygen sensor (bank 1 sensor 1) with an NGK 21546 however …

Codes vs Onboard message; Onboard Messages: Reduced engine power, Service Traction control, I get no codes Codes: P0223 Throttle Position (TP) Sensor 2 Circuit High Voltage; P0443 EVAP …