I'm not sure why it would be bad now, but I get a cel with the O2 sensor... Possible to break them???

 

It's possible it's just a coincidence that when you installed the y-pipe, the 02 sensor gave up.....they usually give around 80-120K miles. Or, they could have not have screwed it in properly, attached the wires properly or got them dirty. Inspect the sensor plug before you get a new one just in case.

 

They break very easily. Reportedly, the Nissan service manual says if you drop one from 8 inches, it's going to need to be replaced. I broke both of mine installing the pipe... $180 for 2 new ones.

 

Clean them first. I had a CEL after redoing my entire exhaust and my left and right bank O2s were "bad". I removed them and found anti-seize had coated the sensorheads. I used an old sock and some rubbing alcohol to clean them off, reset my ECU and all was good. Be careful of what you use to clean them though as a lot of compounds will kill the sensor.

~THT

 

I just got a cel today but didnt check out the codes. The first day of installation there was no cel but then today after reving it all day i went to get gas it just lit up. Any possiblitities wat else could it be other than an o2 sensor.

 

It could be a hundred things...pull the codes if you wanna know!

 

None of my sensors went bad when I put on my y-pipe. I do think it is possible that you could have broken one of them or just not put it back in there correctly. I didn't know all that much about those, but my older brother told me how to handle them and they were fine. Props to him.

 

my sensors were jammed in the old y-pipe so I assumed I bumped them pretty good taking them out. So when I started the car and had a CEL I wasn't suprised. I pulled the codes and it was for both sensors. I got two new ones for around $180 as Eric425 said. and after putting them in and resetting my ECU my CEL went away.

 

did you guys see a difference in power after replacing them? I don't even know if O2 sensors can cause power loss....

 

Yes, the front two will cause a power loss if malfunctioning. The one in the cat won't affect power though.

~THT