Powertrain
generic / SAE
P2A02
O2 Sensor Circuit Range/Performance Bank 1 Sensor 3
The optional third oxygen sensor on bank 1 (typically downstream of a second catalyst) returns implausible values during long-term monitoring.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberA / 02
Possible causes
- Sensor aging high
- Sensor element aged beyond calibration window low
- Sensor mounting loose - signal damping 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: 120–400 €
- Estimated time: 0.5–1.5 h
- Component: oxygen sensor
- Component: catalytic converter
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012