Powertrain
generic / SAE
P2196
O2 Sensor Signal Stuck Rich (Bank 1, Sensor 1)
The upstream oxygen sensor on bank 1 returns a constant rich signal under deceleration fuel cut-off where lean is expected. Often a contaminated sensor (silicone, oil, coolant) or short to ground that pulls the signal high in some sensor types.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number1 / 96
Possible causes
- Upstream sensor contaminated high
- Upstream sensor failed stuck rich 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
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012