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Hello Klaus,
what fan are you referring to? I forgot to mention I introduced sea foam into the vac line to do some cleaning and as I'm sure you know it produces a ton of smoke... it was then that I noticed an exhaust leak at the cat- could this be part of my problem- the rear 02 sensor is just after where I have a leak.
I'm going to check the wiring to start with then the vacuum lines and go from there.
Another thing on the to do list- my odometer stopped working yesterday!
I still love my Volvos though ;)
cheers,
greendread
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