OBD-II code · Powertrain (generic)
P01B7 Alternative Fuel Rail Temperature Sensor Circuit High
Alt fuel rail temp sensor signal voltage above expected range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P01B7?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire open
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Alt Fuel Rail Temp Sensor, Sensor Wiring
Related codes
- P01B4Alternative Fuel Rail Temperature Sensor Circuit
- P01B5Alternative Fuel Rail Temperature Sensor Performance
- P01B6Alternative Fuel Rail Temperature Sensor Circuit Low
- P01B8Alternative Fuel Rail Temperature Sensor Circuit Intermittent/Erratic
- P01B9Engine Oil Temperature Sensor B Circuit
- P01BAEngine Oil Temperature Sensor B Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.