Help! I am a first time audi owner and have had my car for 2 years now. The gas mileage has dramatically dropped to 19 now. My custodian (I'm a teacher) has changed the spark plugs and filters using original parts. I did have some transmission problems in the fall and a refurbished transmission was put in. In the process the o2 sensor was damaged and the dealer said that didn't matter. Anybody have any ideas for me? With the price of gas the way it is I really am interested in finding out if there is a problem. Thanks.

The O2 sensor does matter!
Get that replaced.
Which year and engine is it?

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