P2D91
Engine Oil Pressure Sensor/Switch C Range/Performance
The ECM detects a range/performance fault on the engine oil pressure sensor/switch c. Reading cannot be used reliably for control.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Sensor characteristic driftedCommon
- Sensor mounting displacedPossible
- Sensor element aged beyond calibration windowLess likely
Parts involved
- Engine Oil Pressure Sensor C
- Wiring Harness
- ECM
P2D91 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.