OBD-II code · Powertrain (generic)
P0479 Exhaust Pressure Control Valve A Intermittent
Exhaust pressure control valve A drive signal is unstable.
Is it safe to drive with P0479?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyIntermittent connector
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Exhaust Pressure Regulator
Related codes
- P0475Exhaust Pressure Control Valve A
- P04A3Exhaust Pressure Control Valve B Intermittent
- P0476Exhaust Pressure Control Valve A Range/Performance
- P0477Exhaust Pressure Control Valve A Low
- P0478Exhaust Pressure Control Valve A High
- P047AExhaust Pressure Sensor B Circuit
- P047BExhaust Pressure Sensor B Circuit Range/Performance
- P047CExhaust Pressure Sensor B Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.