P2254
O2 Sensor Negative Current Control Circuit/Open Bank 2 Sensor 1
O2 sensor
Generic OBD-II
Medium
What it means
P2254 means the ECM detects an open in the negative current control circuit for the bank 2, sensor 1 wide-band oxygen (air/fuel) sensor. This circuit is part of how the sensor measures mixture, so fuel control on that bank is affected. It's an electrical fault, usually an open wire, a bad connector, or a failed sensor rather than an engine problem.
Medium
Can I keep driving? The engine usually runs, but air-fuel control on bank 2 can be off; expect possible poor economy or rough running, and fix it to protect the catalytic converter.
Common symptoms
What you'll notice
- Check-engine light on
- Rough or uneven idle
- Higher fuel consumption
- Hesitation or surge
Common causes
Most likely first
- Open in the negative current control circuit wiring (bank 2, sensor 1)Likely
- Faulty wide-band air/fuel (O2) sensor, bank 2 sensor 1Common
- Poor or corroded connector at the sensorCommon
- PCM or sensor-driver fault (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data, then inspect the bank 2 sensor 1 connector and wiring for an open in the negative current control circuit.
- Check continuity and resistance of the circuit back to the PCM.
- Test the air/fuel sensor per the service data.
- Repair the open wiring or replace the sensor as indicated.
- Clear the code and retest.
FAQ
Quick answers
Is it safe to drive with P2254?+
Short-term usually, but with this circuit open the sensor can't measure mixture properly, so bank 2 fuel control and economy suffer and the converter can be affected over time. Repair it soon.
Can I just clear P2254?+
You can, but an open circuit will set it again immediately until the wiring or sensor is repaired.
Related codes
Often seen with P2254
Read & clear P2254 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX