OBD-II code · Powertrain (generic, extended)
P2B8B Intake Air O2 Sensor Heater Control Circuit/Open Bank 1
The control circuit for the intake air O2 sensor heater on bank 1 is open. Sensor cannot reach operating temperature.
Is it safe to drive with P2B8B?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen in heater control wire
- PossibleOpen heater element
- Less likelyPin pushed back out of connector body
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
- P2B88Intake Air O2 Sensor Circuit Bank 1
- P2B89Intake Air O2 Sensor Circuit Low Voltage Bank 1
- P2B8AIntake Air O2 Sensor Circuit High Voltage Bank 1
- P2B8CIntake Air O2 Sensor Heater Control Circuit Range/Performance Bank 1
- P2B8DIntake Air O2 Sensor Heater Control Circuit Low Bank 1
- P2B8EIntake Air O2 Sensor Heater Control Circuit High Bank 1
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.