OBD-II code · Powertrain (generic, extended)
P2244 O2 Sensor Reference Voltage Circuit Range/Performance (Bank 1 Sensor 1)
The reference voltage that the ECU supplies to the wide-band oxygen sensor on bank 1, sensor 1 drifts outside the expected range. The reference is the baseline against which the cell voltages are measured; a drift falsifies every lambda calculation.
Is it safe to drive with P2244?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyReference circuit drift in ECU
- PossibleHigh resistance in reference wiring
- Less likelySensor element aged beyond calibration window
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Oxygen Sensor Upstream, Oxygen Sensor Wiring, Ecm
Related codes
- P2248O2 Sensor Reference Voltage Circuit Range/Performance (Bank 2 Sensor 1)
- P2241O2 Sensor Pumping Current Circuit Low (Bank 2 Sensor 1)
- P2242O2 Sensor Pumping Current Circuit High (Bank 2 Sensor 1)
- P2243O2 Sensor Reference Voltage Circuit (Bank 1 Sensor 1)
- P2245O2 Sensor Reference Voltage Circuit Low (Bank 1 Sensor 1)
- P2246O2 Sensor Reference Voltage Circuit High (Bank 1 Sensor 1)
- P2247O2 Sensor Reference Voltage Circuit (Bank 2 Sensor 1)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.