OBD-II code · Powertrain (generic, extended)
P2B8E Intake Air O2 Sensor Heater Control Circuit High Bank 1
Voltage on the intake air O2 sensor heater control line on bank 1 is above the expected window. Wire shorted to B+ or heater element open.
Is it safe to drive with P2B8E?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyHeater wire shorted to B+
- PossibleOpen heater element
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine light on after several drive cycles
- Slightly increased fuel consumption during cold start
- Delayed entry into closed-loop fuel control
- Failed emissions inspection (lambda readiness)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Intake Air O2 Sensor B1, Intake Air O2 Sensor Heater B1, Wiring Harness, Ecm
Related codes
- P2B8BIntake Air O2 Sensor Heater Control Circuit/Open Bank 1
- P2B8CIntake Air O2 Sensor Heater Control Circuit Range/Performance Bank 1
- P2B8DIntake Air O2 Sensor Heater Control Circuit Low Bank 1
- P2B8FTurbocharger/Supercharger B Temperature Sensor Circuit
- P2B90Turbocharger/Supercharger B Temperature Sensor Circuit Low
- P2B91Turbocharger/Supercharger B Temperature Sensor Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.