Powertrain
generic / SAE
P2246
O2 Sensor Reference Voltage Circuit High (Bank 1 Sensor 1)
The reference voltage on the bank 1, sensor 1 wide-band oxygen sensor reads above the upper threshold. Common with a short to a positive supply or a corroded connector with leakage current.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 46
Possible causes
- Reference line shorted to positive high
- Connector corroded with leakage medium
- Supply wire pinched against B+ source 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: 120–500 €
- Estimated time: 0.5–2 h
- Component: oxygen sensor upstream
- Component: oxygen sensor wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012