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valve to the CO2 sensor
I just purchased a 2006 x3 and the service engine light came on...the dealer took it back and stated the codes showed I had two O2 sensors out or almost out. After they have had the car for a day they tell me it wasn't the O2 sensors at all but the valve (CSB valve?) that leads to the o2 sensor that needed replacement. Does this make sense?
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