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Update to Bad Exhaust Smell in Cabin 900 1996

I have a 1996 960 with 203k miles. I posted a couple of weeks ago about a bad exhaust smell in the cabin when the car is sitting still idling. I also wanted to add that ever since the outside temperature has dropped here from 30s-40s to 10s-20s, the fuel economy has also dropped. It's been going down about 1 mpg per fuel up since end of November. I was getting 23-24 mpg, and it dropped to 22, then 21, then 20, now my latest fuel up showed 19 mpg.

In the previous post someone mentioned a bad O2 sensor. Are these symptoms indicative of a bad O2 sensor? It really does seem to be running rich. My exhaust smell has an extremely strong, gasoline smell. On cold mornings, the exhaust is white and heavy.

Thanks,
Chris Eaker






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