rear o2 sensor hitting drive shaft
 

no cat.. I added a spacer to the rear o2 sensor so the p0133 or p0420 code will reset.. no service engine light but rear o2 sensor hitting drive shaft... is there different sizes of spacers or is there a better way??

Why is your o2 sensor facing the drive shaft? My o2 faces outward toward passenger side away from the drive shaft. Do you have a aftermarket exhaust and if so is it possible the pipe before the muffler is 180 rotated? Can you post a picture?

maybe he put his test pipe on backwards--anyway search ebay and buy the size you need or turn you test pipe around.

take ur test pipe to a muffler shop and have them weld in an o2 bung facing out. $10 bucks and just plug the old one.