how to turn rear 02s off

[99regshort]

i am very new to hpt so go easy on me. i think my truck is over fueling because i have taken my cats out. its dropped in mileage allot since. i remember reading about turning something off in the tune to fix it but can not find it. also while im plugged in what elce should i start to play with? also i have changed nothing yet. thanks

[rel3rd]

To turn off REAR O2's, simply go to the "DTC" section (Diagnostic Trouble Codes) and change anything that says oxygen sensor Bank 1 and Bank 2, Sensor 2 to "No Error Reported".

It's over-fueling because of how LEAN the engine is now with headers and no cats. It is overcompensating by adding fuel. What you need to do is TUNE the truck now. Once VE and MAF are tuned PROPERLY, the mileage will return (if not rise), and the performance will also increase.

Plenty of reading about tuning that you can do, right on HPTuners site. It's definitely time consuming, but the end results are usually worth the time invested. There's also plenty of HPT tuning guides scattered all over the internet.

Here's a nice one:
LS1 Tuning Guide - Free Help Files

Good Luck to you.

[Atomic]

the green ones

[oleshifty]

will these trucks still pass emission tests with this turned off?


hypothetically of course....

[rel3rd]

Obviously not a visual, but if your state has the test where it's simply just checked for DTC's, you're good to go...

I used to love pulling into the emissions station in my old 2000 SS Camaro with the cam loping and no codes....PASS...lol

Hypothetically, of course.

[oleshifty]

....ok, so the headers with offroad pipe will not need to be changed whenever I drive "onroad" THANK GOD


I've been trying to get an answer for that for 3 years. Allen always dodges that one.

[trx2stroke4life39]

the green ones

If you enable the SES you will be able to pass all the test that are performed during start up.