O2 Sensor Negative Current Control Circuit Low Bank 1 Sensor 1
What it means
P2252 means the negative current control circuit of the bank 1, sensor 1 oxygen sensor is reading too low. This is the upstream wide-band air/fuel sensor, whose internal pumping-current circuit lets it measure the exhaust mixture precisely and feed fuel control. A low reading usually points to a wiring fault or a failing sensor. The engine still runs, but fueling can be off, causing rough idle, surging, or higher fuel use.
Can I keep driving? Driveable, but this upstream air/fuel sensor helps control fueling, so you may notice rough idle, surging, or higher fuel use; repair before long trips.
Common symptoms
What you'll notice
- Check-engine light on
- Rough or unstable idle
- Surging or hesitation
- Higher fuel consumption
Common causes
Most likely first
- Faulty wide-band air/fuel (O2) sensor, bank 1 sensor 1Likely
- Open or shorted wiring in the negative current control circuitCommon
- Poor or corroded connector at the sensorCommon
- Exhaust leak near the sensor affecting its operationLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the bank 1 sensor 1 connector and wiring for damage, corrosion, or a short to ground.
- Check the sensor's current-control circuit voltage and continuity against spec.
- Inspect for exhaust leaks near the sensor that can disturb its readings.
- Replace the air/fuel (O2) sensor if the current control circuit stays low with confirmed-good wiring.
FAQ
Quick answers
Is it safe to drive with P2252?+
Can I just clear P2252?+
Related codes
Often seen with P2252
Read & clear P2252 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.