Powertrain
generic / SAE
P2A01
O2 Sensor Circuit Range/Performance Bank 1 Sensor 2
The rear oxygen sensor on bank 1 does not show the expected slow steady-state behaviour after the catalyst. Either the sensor is degraded or the catalyst itself behaves abnormally.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberA / 01
Possible causes
- Sensor aging high
- Catalyst aging 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: 120–400 €
- 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