So I have anauto 2000 s70 glt se with est downpipe, catback, and intake. After I got my turboback installed I have had multiple problems.
1. Cel keeps on going on, went to the dealer to reset, they did it but it came back (said it was from dp)
2. When I go WOT at 30mph it downshifts then will only go to 5500rpm before I get a slighty jerky, awkward feeling shift.
3. The car does not pull as hard as it did before. When I first opened the car up after the exhaust install, it was faster, now it seems as though I have lost some performance where it is worse then stock.
4. When I go WOT at 55-60 I get a downshift to 2nd and it will pull slow (comparitively to before) and sometimes the car will just stay at a certain rpm, before jumping up a bit, then pulling slow.For example,today I was driving on a deserted road to figure out the problem and I floor the car and you could hear the downshift but I wasnt moving up in rpms, then it began to pull slow. Any ideas of what the problem could be. Maybe a boost leak? [/align]

 

What was the CEL?

I mean it could be anything.

-Exhaust leak
-Bad 02 sensor
-Etc...

 

all the guy at the volvo dealership told me was that the cel went on because a code was thrown from the downpipe o2 sensor.

 

so what did you do about the O2 sensor?