P2A4C
Alternative Fuel Temperature Sensor Range/Performance
The alternative fuel temperature signal does not match plausibility checks against ambient and fuel-rail temperatures. 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.
- Sensor characteristic driftedCommon
- Sensor mounting displaced from fluid pathPossible
- Sensor element aged beyond calibration windowLess likely
Parts involved
- Alt Fuel Temperature Sensor
- Wiring Harness
- Afcm
P2A4C 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.