P2A0B
Manifold Absolute Pressure Sensor B Circuit Range/Performance
The MAP B signal does not correlate with TPS, MAF, or RPM as expected. Vacuum leak, restricted port, or sensor drift.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Vacuum leak in intakeCommon
- Sensor zero driftedPossible
- Sensor element aged beyond calibration windowLess likely
Parts involved
- MAP Sensor B
- Wiring Harness
- ECM
P2A0B 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.