Is running all 4 o2s really needed? Once everyone tunes, do you delete the back ones?

 

I run all 4, not sure why I wouldn't?

 

I don't see the need. One is 10" from the other. I don't run cats, so....pointless?

 

The second row of sensors arent needed if cats are removed as they will be disabled from the ECU, also they dont have any impact on engine management as the first row - AFR

You can leave them there or remove them, depends how the exhaust is made and if they are removed from the tune.

 

What I figured. Same as my ls motor set ups. The car had a tune on it when I bought it, but had stock exhaust. I can tell something else was there though. Not sure if mine are on or off. I was thinking its time for some new ones and was shocked at the price. Didn't want to do 4 when I know 2 is only needed.

 

NO need to run the secondaries if can turn off the CEL. Guess it's doesn't really matter if they're there or not though. I'm sure they don't cause any restriction.

I'm runing zero stock sensors

Just the wideband with pro112.

 

I assume you don't need to pass emissions where you're at?

 

What's emissions? Lol. I'd refuse to even live anywhere with those pesky things

 

i have to pass emissions were I'm at. every time i go they stick a mirror under the front tire looking for cats. then put the mirror up. special file on the computer takes care of any obdII readings

 

Haha..weeeeeeeeellllll.... I need to start thinking about how I'm going to approach that. I still have one year until emissions are due. A good tune, stock cats, might get me by...BUT I highly doubt it.

 

I just had my emmissions done. They no longer do a visual inspection or a sniff test. It is now just like in Cali. All your readiness codes must be met. You can't just shut off the CEL via a tune.

 

really?? my last test was on the rollers with sniffer only. So they changed heh? :/

 

Yes, new change this year. My last test two years ago was sniffer also. Sniffer is now only used on older pre-obd cars (generally pre 1990). I spoke with the guy at the testing station and all the newer cars are scanned to make sure all readiness codes display "pass". You can't just disable things as in many other parts of the country where the tests are more lenient.

 

I run 2 O2's..........

 

Crap.....how are you passing it?