Powertrain
generic / SAE
P2A05
O2 Sensor Circuit Range/Performance Bank 2 Sensor 3
The third oxygen sensor on bank 2 (after a second catalyst stage on some vehicles) returns implausible values. Often related to sensor aging or mechanical exhaust leak upstream.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberA / 05
Possible causes
- Sensor aging high
- Exhaust leak upstream 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: 120–500 €
- Estimated time: 0.5–1.5 h
- Component: oxygen sensor
- Component: exhaust pipe
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012