P2253
O2 Sensor Negative Current Control Circuit High Bank 1 Sensor 1
Oxygen sensor
Generic OBD-II
Medium
What it means
P2253 means the ECM sees high voltage on the negative current-control circuit of the front (bank 1, sensor 1) wideband air-fuel sensor — typically an open or high-resistance connection. That circuit is part of how the sensor measures the mixture, so the engine may run open-loop with worse economy until the wiring or sensor is repaired.
Medium
Can I keep driving? Drivable, but with the front air-fuel sensor circuit faulty the ECM may run open-loop — expect worse fuel economy and possibly rough running until it's fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Poorer fuel economy (ECM may run open-loop)
- Possible rough running or hesitation
- Failed emissions readiness / test
Common causes
Most likely first
- Open or high resistance in the sensor's negative current-control circuitLikely
- Faulty front wideband oxygen / air-fuel sensor (bank 1, sensor 1)Common
- Poor or corroded connector at the sensorCommon
- Faulty ECM sensor driver (rare)Less often
How to diagnose & fix
Work through it in order
- Inspect the bank 1 sensor 1 connector and the negative current-control wiring for damage or corrosion.
- Check the circuit for an open or high resistance back to the ECM.
- Confirm the sensor's other circuits (reference and pump) are intact.
- Replace the front air-fuel sensor if the wiring checks out.
- Clear and complete a drive cycle to confirm closed-loop control.
FAQ
Quick answers
Is it safe to drive with P2253?+
It runs, but the front air-fuel sensor may not report correctly, so the ECM can't fine-tune fuelling. Economy suffers and it may run rough — fix it before it affects the catalytic converter.
Can I just clear P2253?+
It returns while the circuit fault is present; the wiring or sensor must be repaired to restore normal fuel control.
Related codes
Often seen with P2253
Read & clear P2253 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