P2244
O2 Sensor Reference Voltage Performance Bank 1 Sensor 1
O2 sensor
Generic OBD-II
Medium
What it means
P2244 means the ECM detects a performance problem with the reference voltage it supplies to the bank 1, sensor 1 wide-band oxygen (air/fuel) sensor. That reference is how the sensor reports mixture, so fuel control suffers. It's usually the sensor itself, or wiring, resistance, or connector problems in the reference circuit, rather than an engine mechanical fault.
Medium
Can I keep driving? The engine usually runs, but air-fuel control 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
- Faulty wide-band air/fuel (O2) sensor, bank 1 sensor 1Likely
- Wiring open, short, or high resistance in the sensor reference circuitCommon
- 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 1 sensor 1 connector and reference wiring for damage or corrosion.
- Check for the correct reference voltage and a good ground at the sensor.
- Test the air/fuel sensor per the service data and replace it if out of spec.
- Repair any wiring or connector faults.
- Clear the code and retest.
FAQ
Quick answers
Is it safe to drive with P2244?+
Short-term usually, but with the reference voltage off the sensor can't report mixture accurately, so fuel control and economy suffer and the converter can be affected over time. Repair it soon.
Can I just clear P2244?+
You can, but it returns until the sensor or its reference circuit is repaired.
Related codes
Often seen with P2244
Read & clear P2244 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