P047A
Exhaust Pressure Sensor B Circuit
A general electrical fault on exhaust pressure sensor B — used to monitor backpressure across the DPF or to control variable-geometry turbo.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Sensor failedCommon
Parts involved
- Exhaust Pressure Sensor
P047A 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.