What does a permanent fault code mean?

[LeEleanor]

Permanent fault codes refer to certain undeletable fault codes generated by a vehicle. These fault codes remain stored in the vehicle's system and generally cannot be erased or modified. Hazards of permanent fault codes: Permanent fault codes may affect the vehicle's ECU judgment, potentially causing misjudgments. Symptoms of misjudgment may include sudden idle vibration, unstable RPM, or unexpected illumination of warning lights. Common methods to clear fault codes: 1. Disconnect the negative terminal of the battery for more than 20 seconds to power off the vehicle and enter sleep mode, then reconnect power (some functions may require reinitialization). 2. Use a diagnostic scanner to read data streams and clear fault codes - typically done after component replacement and successful test driving to erase stored fault codes.