OBD-II code · Powertrain (generic, extended)
P2A3D O2 Sensor Negative Current Control Circuit High Bank 1 Sensor 3
Voltage on the wide-band oxygen sensor negative pump current line of bank 1 sensor 3 is above the expected window. Wire shorted to B+ or pump cell open.
Is it safe to drive with P2A3D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyPump current wire shorted to B+
- PossibleOpen pump cell
- Less likelyConnector pins corroded - high contact resistance
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
- P2A3AO2 Sensor Positive Current Control Circuit High Bank 1 Sensor 3
- P2A3BO2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 3
- P2A3CO2 Sensor Negative Current Control Circuit Low Bank 1 Sensor 3
- P2A3EAlternative Fuel Delivery Error
- P2A3FExcessive Time to Enter Alternative Fuel Control
- P2A40Alternative Fuel System - Injector Leakage to Rail Detected
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.