Powertrain
generic / SAE
P0156
O2 Sensor Circuit Malfunction (Bank 2, Sensor 2)
Same condition as P0136 but on the downstream sensor of bank 2. The catalyst efficiency monitor for bank 2 cannot run while this fault is active.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / 56
Possible causes
- Downstream sensor aged high
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 60–250 €
- Estimated time: 0.3–1.5 h
- Component: oxygen sensor downstream
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012