Powertrain
generic / SAE
P2379
O2 Sensor Out of Range During Deceleration Bank 2 Sensor 2
During fuel cutoff on overrun the post-catalyst lambda sensor on bank 2 should drift toward a fixed lean reference voltage. If it stays outside the expected window the ECU sets this fault, indicating either a slow or stuck downstream sensor or an exhaust leak that draws unburnt gas across it.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / 79
Possible causes
- Sensor element slow or aged high
- Exhaust leak between catalyst and sensor 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: 120–350 €
- Estimated time: 0.6–1.5 h
- Component: oxygen sensor b2s2
- Component: exhaust after catalyst b2
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012