I had a bad o2 sensor and my cat was begining to act up so i decided to buy all new o2 sensors and get a straight pipe installed with my y-pipe so that i could kill two birds with one stone. So i was wondering if the lack of any cats at all would cause my o2 sensor to work improperly and give my car a cel? If thats the case then how do people use straight pipes without messing up their o2 sensors and without gettin a cel?
Thanks,
Will

 

Yeah! I'd like to know this also! I hace a CEL for my rear O2 sensor because of no cats. What can be done??

 

i had my ypipe and straight pipe for almost 2 years and no cel, i dont know, i sprayed all my O2 sensors with electrical clean spray b4 installing the y and straight pipe

 

I burned throught a stillen Y pipe with a hollowed cat, no problems with the O2
sensors.I Bought a cattman y pipe and SS straight pipe still no problems with the O2s.

 

i guess the only way for me to find out would be to install it and find out. Ohh and what is electric clean spray?

 

No problems here. Don't Hollow your cat! hopefully you have a pipe inside, otherwise it just upsets the airflow...

 

yes i heard a hallowed cat upsets air flow also, i bought elecric cleaner spray at pepboys or strauss

 

So no one else with a 95-96 Maxima (these are the ones with the rear O2 sensor in the main Cat converter) has this CEL code??

Strange because when I had a Cat converter this code didn't come up. It only comes up when I don't have the cat.

Supposing my O2 sensor IS damaged... does this decrease my Max's performance?