took my car to autozone and check for codes and it gave me a bad o2 sensor do you guys think thats why the car is missfiring when I steep on the gas and also is runing rich and when Im acelrating the boost goes up and down is these a boost leak or can it be because of the o2 sensor because thats the only code im getting thanx....

 

Post the code.

 

u say it misfiring... but it didnt throw a misfire code also?

 

Maybe he means backfiring rather than misfiring, possibly due to the bad o2?

 

Hey rafa, i dunno if its you from cardomain, w/e but my car backfires as well, im going to autozone soon to get it checked. I think its my cat thats causing the problems, but everyone on here think my car is misfiring and throwing codes. Ill let you know.

 

A bad02 sensor wont cause a misfire, but a misfire will cause an 02 sensor code to come up due to unburntfuel/gases passing intoand "shocking" the cat. If the engine is misfiring, you should have fault codes strored for which cylinder it is happening on. If you get a cyl.2 misfire code, swap the coil pack with cyl.3 and see if the misfire fault code follows the coil pack. If it does, get a new coil pack. A boost leak can cause you to run rich and misfire. But getting the misfire fault codes and swapping coil packs is sometimes easier than trying to find a boost leak. Sooooo... DO you have specific cylinder misfire codes or not?

EDIT
Just went and looked at your other thread: https://www.audiforums.com/m_475932/.../tm.htm#476099
So you replaced the coil pack(s)?
If you have a pre 2000 1.8t, Im willing to bet $20 that your ICM is bad. (Located ontop of the aribox) Its very common to get a cyl. 2 misfire when that thing goes bad.

 

ok so what I did is I changed the o2 sensor before the cat and erased the codes I driven the car for three days and the check engine light does not turn on anymore but still when I steep on the gas more than half way down or down shift and step on it which is when the turbo begins to work harder I get the jumping and sputter and backfires I really dont know what to do next plz someone help me ....

 

and no I dont have any cylinder missfire codes or nothing evrithing is clear....

 

also I dont have a catalitic converter just a 3 inch pipe all the way backcould these be the problem ?

 

Check for hidden codes, codes without a CEL.