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Old 11-15-2012, 02:31 PM
rrhollander rrhollander is offline
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Location: Austin
Join Date: Nov 2012
Posts: 9
Mein Auto: 2006 X3
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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