Thread: Bad 02?

How can you tell you got a bad 02 sensor?

My SES light came on for it, and Nissan and my mechanic says its my header making the light, but ive had the header on for about a year and a half now.

Another problem - recently my car has been having high idle, idle that spikes up when i stop, and my car was stalling out everytime i tried to re-start it, it starts and then dies. Could this be a bad 02 (stupid question ) or my spark plugs? But with AC on my car doesnt die, but all the other problems are still there.

Do you have a cat? Try the idle relearn.

I have one cat, since the header replaced the other. Ill try the idle relearn today.

But whats gets me is why would i have to do the idle relearn, if i didnt do anything to the car.

Originally Posted by illoosionz

But whats gets me is why would i have to do the idle relearn, if i didnt do anything to the car.

Shit happens :razz:

IM about to give my car a cleveland steamer for acting up.

Try the idle relearn. Shit happens over time like he said lol.

You may be throwing the light from the missing cat. Try an o2 spacer. Sometimes it can happen out of the blue...weather and shit.

you should reset the check engine light, after that you can try idle relearn

(reset it by computer, or just unplug the battery for a few minutes)

Originally Posted by TosHaNYC

you should reset the check engine light, after that you can try idle relearn

(reset it by computer, or just unplug the battery for a few minutes)

The idle relearn isn't going to take away the code. It will probably pop right back up after a few turn overs. I would say it's from the missing cat and he should try an o2 spacer.

I got an 02 spacer already. The cat code just came up about a month ago. I had the header and spacer for about a year and a half already.

Originally Posted by illoosionz

I got an 02 spacer already. The cat code just came up about a month ago. I had the header and spacer for about a year and a half already.

how mani anti foulers did you use ? try another spacer on top of that one to space the 02 further away.

gotcha, i used one, im gona ttry to use another.