Powertrain
generic / SAE
P2195
O2 Sensor Signal Stuck Lean (Bank 1, Sensor 1)
The upstream oxygen sensor on bank 1 returns a constant lean signal during conditions where rich content is expected (for example after a deceleration fuel cut-off recovery). Usually a sensor that has lost its rich-side response or a slow heater warm-up.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number1 / 95
Possible causes
- Upstream sensor failed stuck lean high
- Sensor heater slow to warm up medium
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–500 €
- Estimated time: 0.3–2 h
- Component: oxygen sensor upstream
- Component: oxygen sensor heater
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012