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Jan 7/29/2011

2005 Mini Cooper S 4 Cyl 1.6L


05 Cooper S check engine code P136

I cleared the code and the check engine light was off for about a week. Now it's back on. looks like it's the downstream O2 sensor. I saw a TSB listed about this code but couldn't read the complete message. I have a new sensor to put in. Guess the best thing is to check the connector etc. before replacing. The car has 37,000 miles. Thanks!

1 Answer


Jimm 7/29/2011

P0136 = Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)
Possible symptoms = Poor fuel mileage, possible misfire, depending on O2 sensor position when sticking.

A code P0136 may mean that one or more of the following has happened:

Faulty O2 sensor leak in exhaust close to O2 sensor
Short to voltage on O2 signal circuit
Open in circuit resistance caused by corrosion in connector

Possible Solutions:
Replace the second oxygen sensor on bank 1
Repair open or short in signal circuit
Clean corrosion from connector


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