Powertrain
generic / SAE
P0136
O2 Sensor Circuit Malfunction (Bank 1, Sensor 2)
A general fault has been detected in the downstream (post-catalyst) oxygen sensor on bank 1. The downstream sensor monitors catalyst efficiency rather than fuel mixture; with no signal, the catalyst monitor cannot run.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / 36
Possible causes
- Downstream sensor aged high
- Wiring chafed against exhaust medium
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
- Component: oxygen sensor wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012