OBD-II code · Powertrain (generic, extended)
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.
Is it safe to drive with P2A4B?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyTemperature sensor failed
- PossibleWiring or connector fault
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- Parts involved
- Alt Fuel Temperature Sensor, Wiring Harness, Afcm
Related codes
- P2A48Alternative Fuel Tank C Pressure Sensor Circuit Low
- P2A49Alternative Fuel Tank C Pressure Sensor Circuit High
- P2A4AAlternative Fuel Tank C Pressure Sensor Circuit Intermittent/Erratic
- P2A4CAlternative Fuel Temperature Sensor Range/Performance
- P2A4DAlternative Fuel Temperature Sensor Circuit Low
- P2A4EAlternative Fuel Temperature Sensor Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.