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
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References
sae:J2012