Ok so my cel came one and the problem is i need a new oxygen sensor. it said bank one sensor 2. is this a big deal or can i wait awhile to get it fixed?

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2000 audi a4 1.8t

That sensor is the post-cat sensor, which the ECU reads to determine how well your catalytic converter is working. Sensor 1 is the one that is used to determine fuel mixture, and so is the more important of the two when talking about driveability. If you have smog testing coming up, you need to replace it, but if you're just driving for awhile and don't have to worry about an emissions check, you should be OK. I wouldn't wait too long though.

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99 2.8QM

ok cool thanks man

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2000 audi a4 1.8t