P0479

DTC P0479, sometimes indicated as P047900 is an OBD diagnostic trouble code indicating a generic fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the auxiliary emissions system causing exhaust pressure control valve "a" intermittent.

The exhaust pressure control valve is used to maintain the correct exhaust pressure in the system. If this valve malfunctions, it can cause the engine to run too rich or too lean. The P0479 code is set when the engine controller detects an incorrect exhaust pressure.
There are several possible causes for this code, including a defective exhaust pressure control valve, a defective exhaust pressure sensor, or a defective engine controller.
If you have this code, first check the exhaust pressure control valve for proper operation. If it is defective, replace it. If the valve is working properly, check the exhaust pressure sensor for proper operation. If it is defective, replace it. If the sensor is working properly, check the engine controller for proper operation. If it is defective, replace it.

• P0479: Exhaust Pressure Control Valve A Intermittent
• P0479: Exhaust Pressure Control Valve "A" Intermittent
• P0479: Exhaust Pressure Control Valve CKT Intermittent
• P0479: Exhaust gas pressure control valve – circuit intermittent
• P0479 00: Exhaust gas pressure control valve - circuit intermittent
• P0479 00: Exhaust pressure control valve - intermittent failure