What are Car Fault Codes?

Modern cars are controlled by an ECU.
This is a mini computer, sometimes called a 'brain' and it tells the engine how much fuel is needed for example when the engine is cold or when you press the accelerator.
The ECU receives a lot of information from different sensors on the engine; when any of these components malfunction the ECU will show a car fault code so that you know what is wrong and to assist repair.

EOBD (Electronic on board diagnosis)
On BD is an international standard set to establish standards to encourage manufacturers "to design reliable emission control systems"

A plug connector in the car allows you to connect a scanning tool which will (hopefully) give your car fault codes when (and if) a malfunction occurs.

FAULT DIAGNOSIS - Click this link for a good overview of fault diagnosis

click here for OBD-II, EOBD and VAG trouble code definitions

 BBA-reman are suppliers of a wide range of remanufactured units, including electronics. They also provide many fault code pages for the different components in your car - you can open a new page fault codes to view some of the fault codes

EOBD Fault codes

Fuel air ratio P0100 - P0199

Fuel air ratio P0200 - P0298

Ignition P0300 - P0389

Emission control P0400 -P0492

Idle control, & inputs P0500 - P0570

Serial link & outputsP0600 - P0665

Transmission control P0700 - P0799

Transmission control PO800 - PO849