Maybe I'm just not meant to mod.

[BPMSport]

Originally Posted by Haywood

Thanks. So, the secondary o2's are the rear ones?

Do you live in Melbourne? I went to Florida Tech. Have you been to Meg O'Malleys?

Yes, secondary O2 are the rear ones. The important ones are located closer to the front of the car.

We don't disable the secondary o2s... But this isn't the issue regardless since all of the fault codes are vor kat, and not nach cat.

[pbonsalb]

Originally Posted by Sered

You never replace just one O2 on these cars. The sensors aren't just used for AFR measurements, they are also used to measure EGTs. If one bank is reading significantly different values than the other (and it will if you just replace one), then you're going to have issues.

A new 02 won't necessarily read differently from a used one. But it won't hurt to replace both. I bought 2 new ones when I was doing some trouble shooting a couple of years ago. They are supposed to last 100k or 7 years I think.

[Haywood]

Originally Posted by Mike Benvo

Yes, secondary O2 are the rear ones. The important ones are located closer to the front of the car.

We don't disable the secondary o2s... But this isn't the issue regardless since all of the fault codes are vor kat, and not nach cat.

Thanks, Mike. I'm going to replace the other side and see what happens.

[M3NACE90]

Originally Posted by Haywood

Thanks, Mike. I'm going to replace the other side and see what happens.

did you find the fix on this? having similar issues..

[335sss]

Any fix same issue here as well

[atopa2002]

Originally Posted by 335sss

Any fix same issue here as well

Also check the exhaust gasket between the headers and xpipe if changing the 02 sensors did it clear the codes.

[335sss]

Originally Posted by atopa2002

Also check the exhaust gasket between the headers and xpipe if changing the 02 sensors did it clear the codes.

Good call. Some people have been saying it sounds like I have an exhaust leak since i got my primary's deleted.

[Johal E32]

Originally Posted by 335sss

Good call. Some people have been saying it sounds like I have an exhaust leak since i got my primary's deleted.

Change your exhaust gaskets before you throw any money at oxygen sensors. Torque the header to x pipe bolts to 16 foot pounds.

I was having some lean codes, oxygen sensor codes etc. It turned out I had loose exhaust bolts. Hopefully your issues will be resolvesd from a quick/cheap fix.