Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 44
Possible causes
- Reference circuit drift in ECU high
- High resistance in reference wiring medium
- Sensor element aged beyond calibration window low
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 120–600 €
- Estimated time: 0.5–2 h
- Component: oxygen sensor upstream
- Component: oxygen sensor wiring
- Component: ecm
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012