Powertrain
generic / SAE
P2A00
O2 Sensor Circuit Range/Performance Bank 1 Sensor 1
Long-term plausibility checks show that the front oxygen sensor on bank 1 reacts too slowly or stays too close to a fixed value. The signal does not show normal cross-counts during closed-loop operation.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberA / 00
Possible causes
- Oxygen sensor aging high
- Sensor contamination (oil, silicone) 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: oxygen sensor wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012