Question about Mini Cooper S

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I have a 2002 mini cooper s with an 02 sensor simulator on the downsream o2 sensor. the vehicle still displays a post cat system lean (P2096) code.

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  • 72yellowtruc Aug 07, 2010

    i have one downstream sensor and one upstream sensor. I cant put a simulator on the upstream because thats the one the computer uses for fuel trim values. I havnt tried the carb cleaner trick yet.

  • 72yellowtruc Sep 30, 2010

    ive tried the carb cleaner trick, and got no idle change....i even put a volmeter on the upstream 02 sensor and watched as i sprayed for the voltage to spike rich.....and still got no result. As for the temp sensors, when looking at the values on a scan tool, they all are normal values. Nothing indicated a lean mixture.....not even fuel trims.



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This could be for several reasons. I believe that the mini cooper uses 2 02 sensors, so it's possible that you have a faulty second sensor.
Or you could have a broken or missing vacuum line or intake manifold leak.
The other possible causes are a bad engine temp sensor, when the temp sensor is malfunctioning the computer may increase or degrease the fuel supply, If you getting a decreased fuel supply on a cold engine then you would have a lean exhaust.I would suggest starting with the easy stuff first, you can use a can of carb cleaner to spray around the intake and on vacuum hoses to seem if the engine picks up and idle or decreases in idle. This will tell you if you have a vacuum leak on a hose of manifold.
IF you can find a leak then I would suggest locating the other 02 sensor and use a simulator on it also.
And lastly if this didn't fix it then a test of the coolant temp sensor and the engine temp sensor would be in order.

Posted on Aug 07, 2010


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