P04A3
Exhaust Pressure Control Valve B Intermittent
Same as P049F with intermittent or erratic feedback - typically a connector or harness fault.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Intermittent contact at connector or terminalCommon
- Connector with intermittent contact under vibrationLess likely
- Harness routed against vibrating componentLess likely
Parts involved
- Exhaust Pressure Valve B
- Exhaust Pressure Wiring B
P04A3 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.