Question about Mini Cooper S
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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Posted on Jan 02, 2017
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