What are some symptoms of problems with 02 sensor or pre cat clog? What are some of your experiences with bad 02 sensor/clog? I tried searching but came up with nothing that relates to my problem yet.

Thanks

 

for me:
Problem: bad 02 sensor, my check engine light came on (code 15), and gas mileage was bad as hell... 9 MPG
Replace it with AutoZone Bosh 02 Sensor: $20.00
Diagnois once more.. No more code..

Problem: Pre-Cat clogged, no boost at all. Especially when the secondary comes online. No Boost=Sucks
Replace it with Pettit 3in. DownPipe.
Test FD out!!! Boost Was Crazy!!

 

Do a search in the third gen. tech. forum.
You'll find most of the problem and your answer there.