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Jan 7/29/2011
2005 Mini Cooper S 4 Cyl 1.6L - Engine
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
    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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