Powertrain
generic / SAE
P2248
O2 Sensor Reference Voltage Circuit Range/Performance (Bank 2 Sensor 1)
Bank 2 counterpart to P2244. The reference voltage at the wide-band oxygen sensor on bank 2, sensor 1 is outside its expected range and falsifies the lambda calculation.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 48
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 b2
- Component: oxygen sensor wiring
- Component: ecm
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012