P2A4B
Alternative Fuel Temperature Sensor Circuit
The AFCM detects a generic fault on the alternative fuel temperature sensor. Fuel viscosity and density compensation cannot be applied reliably.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Temperature sensor failedCommon
- Wiring or connector faultPossible
Parts involved
- Alt Fuel Temperature Sensor
- Wiring Harness
- Afcm
P2A4B 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.