Auto trouble codes (or fault codes) are codes that are stored by the on-board computer diagnostic system.
These are stored in response to a problem found in the car by the system.
These codes are stored when a sensor in the car reports a reading that is outside the normal/accepted range
The codes identify a particular problem area and are intended to provide the technician with a guide as to where a fault might be occurring within a car. The codes should be used in conjunction with the vehicle's service manual to discover which systems, circuits or components should be tested to fully diagnose the fault.
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