OBD-II code · Powertrain (generic)
P04A2 Exhaust Pressure Control Valve B High
Same as P049F with the control line shorted to supply.
Is it safe to drive with P04A2?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyControl line shorted to supply
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3.5 h
- Emissions test
- Likely to fail
- Parts involved
- Exhaust Pressure Valve B
Related codes
- P0478Exhaust Pressure Control Valve A High
- P049FExhaust Pressure Control Valve B
- P04A0Exhaust Pressure Control Valve B Range or Performance
- P04A1Exhaust Pressure Control Valve B Low
- P04A3Exhaust Pressure Control Valve B Intermittent
- P04A4Exhaust Pressure Control Valve B Stuck Open
- P04A5Exhaust Pressure Control Valve B Stuck Closed
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.