P04A2
Exhaust Pressure Control Valve B High
Same as P049F with the control line shorted to supply.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Control line shorted to supplyCommon
Parts involved
- Exhaust Pressure Valve B
P04A2 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.