P2244O2 Sensor Reference Voltage Performance (Bank 1 Sensor 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2244 stands for a plausibility fault on the reference voltage side of the bank 1 upstream wide-band sensor: the Nernst-cell signal is electrically intact and within limits, but behaves in a way that does not fit the operating state, for instance offset or too slow. No manufacturer documents P2244 publicly. Ford treats this lead only as an open circuit (P2243) and books shorts on any sensor wire under P0131/P0132; GM, Saab and VW likewise publish only the open-circuit code. Bosch specifies the Nernst cell at a nominal 300 ohms and a load of at most 250 microamps, so ageing or contamination shows up as a shifted reading. CARB requires fuel-control sensors to be checked for implausible values as well as circuit faults. P2243 is the open line, P2245/P2246 low/high, P2248 bank 2.
- What you may notice
- Check engine light
- Slightly higher fuel consumption
- Possible failed emissions test
- Likely causes
- LikelyAged or contaminated wide-band sensor (oil ash, silicone, coolant)
- PossibleHigh resistance in the reference voltage wire or connector
- RareExhaust leak ahead of the sensor distorting the reading
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €80 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.