P222A
Barometric Pressure Sensor B Circuit
A general electrical fault on barometric pressure sensor B — open, shorted, or out of plausibility. The sensor measures atmospheric pressure for altitude compensation; sensor B is a redundant or secondary unit.
- 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
- Barometric Pressure Sensor
P222A 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.