Hello audi owners around the world. I have a 1996 audi a4 2.8 quatt, I know I cant really make it any faster or anything, Im kind of going for a more luxurious look instead of a racer look...anyways, I have a problem. My car is not accelerating like it should, it rattles under the engine and the check engine light is on. Im leaning towards the idea that it probably needs an 02 sensor, I dont want to take the car to the dealership b/c there is only 1 n my city really that does work on audis... and lets just say... they arent... cheap... I need help to know which sensor to replace and where to find it. By the way, I just got the car and I dont have a bunch of money right now! Any help would be F'n fantastic b/c if I need to drive fast, and If i cant fix it myself Im going to sell it to my dad and get a grand prix gtp...seriously

 

If its a rattle - sounds like marbles in a coffe can - the your CAT is out and most likely and your O2 sesor is working. also whenever you say that you have a CEL get the codes and post them here - we can help you a lot more if we know what codes are being kicked out.

 

^^ totally agree the CEL could mean anything and I think in the US you use autozone for free readings ( nothing like that in the UK )

 

So if it rattles the cat is done? Thats not much of a diy job is it?

 

not necessarily the rattle could be a loose heat shield which is common, you need to get under there and have some one accelerate so you can pin point the rattle ( if its from inside the cat ) then its bad

 

Im pretty sure its the cat then.. Do you know anything about replacing them?

 

labree HFC - just posted abou this a little bit ago - not sure if they off a 2.8 verison - you'll have to research
http://labreemotorsports.com/products_vw.html

 

Hey thanks for your help! One more ? tho, Im wondering if the labor will be alot to get the parts put in

 

the early 2.8 UK version didn't have the cat ( pre 1992 ) but the pipe fits very well but you need to leave the O2 sensors in the line other wise clean all the crap out of the cat which is basically the same as a test pipe then see how it goes

 

I've heard how much of bitch the 1.8t is but haven't heard about the 2.8 most likely the same BS with rusted bolts.