I need a new O2 sensor for my A4, its bank 2 number 2. So I believe that is the drivers side after the CAT. I've gone threw a few sponsors and can't seem to find a 4 wire O2 that doesn't cost a arm and a leg? I kind of prefer to get a universal one and hardwire it, but can't seem to find one of those...

 

So far $85 + shipping is the lowest I can find for a universal 4 wire...

 

ttt

 

The universal ones tend to be troublesome. You have to solder them in, and they sometimes throw CEL's. O2 sensors for the 97 2.8 are expensive, it's a fact.