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.

Real-world scan data

Seen in

984

scans in the past year

Found in

0.2%

of scans

0.3%

of scans that found faults

Appears alongside · share of P2244 scans

P0683in 60.9% of scans

P0130in 45.5% of scans

P0110in 44.4% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P2244 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX