What is a Permanent Fault Code in Cars?

[StJaxson]

Permanent fault codes in vehicles refer to malfunctions that affect equipment operation and cannot be restored to normal without intervention. These fault codes are generated by the vehicle's ECU (Engine Control Unit) after analyzing detected issues. Typically, fault codes indicate sensor malfunctions or poor sensor performance, though some mechanical faults cannot be read by the ECU. Basic fault indications may appear on the dashboard, but specialized diagnostic tools are usually required for accurate code reading. Fault codes are categorized into active codes (current issues), stored codes (historical unresolved faults), and intermittent codes (non-persistent sporadic faults), with active codes being the easiest to diagnose.