OBD-II code · Powertrain (generic, extended)
P2A3B O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 3
The control circuit for the wide-band oxygen sensor negative current pump on bank 1 sensor 3 is open. Pumping current cannot be applied for lambda regulation.
Is it safe to drive with P2A3B?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen in pump current wire
- PossibleInternal open in pump cell
- Less likelyPin pushed back out of connector body
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
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
- Oxygen Sensor B1s3, Wiring Harness, Ecm
Related codes
- P2A38O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 3
- P2A39O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 3
- P2A3AO2 Sensor Positive Current Control Circuit High Bank 1 Sensor 3
- P2A3CO2 Sensor Negative Current Control Circuit Low Bank 1 Sensor 3
- P2A3DO2 Sensor Negative Current Control Circuit High Bank 1 Sensor 3
- P2A3EAlternative Fuel Delivery Error
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.