Are the rear O2 sensors a must?

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Originally Posted by tanz45

Your tuner doesn't have the option to disable the rear 02's or the codes?

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I think I can clear the codes, but they will come right back on I think. Anybody know if a handheld(superchips) will turn off rear O2's? I don't think they will.

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Originally Posted by RedHeartbeat

Or find someone with HPTuner or some other software to turn them off. You may have to pay a licensing fee but it may be worth it to you just for that. Do it before the header install. Not too sure how far up into OK you are but I'm in Denton and to license your truck to turn the codes off will cost me $100 to do that or you can go to one of the other guys that are a little further away and can do some tuning tweaks for you later.

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Is that HPTuners that you have? I am looking at splitting one of these with a friend. If we purchase the Pro version($649) can we tune both of our vehicles with the 8 credits it comes with, or only one VIN per software? BTW, only about an 1.5 from Denton. I'll have to come out there and race one night.

Yes, eight credits will allow you both to tune all you want, 2 each license, and then some. If you both have the same year model trucks you can get an unlimited license for 6 credits and be able to tune all the trucks in the world that are your year model. :rock:

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Originally Posted by thunder550

The SES light only flashes when the PCM detects a misfire. There are plenty of other things that could go wrong and potentially be damaging that will illuminate the SES light but not cause it to flash. Best to take care of the SES light for the cats ASAP. Also, don't bother with sims or whatever. You'll probably want a tune with the headers anyway, just have the tuner disable the cat codes while he's in there.

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+1

The only thing that causes a flashing light is a misfire constant and bad enough to cause potential catalytic converter failure due to meltdown from excess unburned fuel in the exhaust stream.

Yep, that happened to me. My cats failed. Now they r clogged.

I used my Superchips to clear the O2 trouble codes last night and went for a drive. I was expecting it to come right back on, but they still have not thrown a code yet. Does it take several cycles before the SES light will come back on?

Sometimes, yes.

+1

This might be a little late, but my solution to the after-cat O2 sensors is pretty low budget. After I put the LT's on, there was no bung for them in the ORY so I zip-tied the rear O2's to the transmission mount. Logically, if they are out of the increased pollutant flow, they won't detect the increased polutants. No codes for me..Then again where I live we have no emissions testing to sneak past.

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Originally Posted by fishoops

This might be a little late, but my solution to the after-cat O2 sensors is pretty low budget. After I put the LT's on, there was no bung for them in the ORY so I zip-tied the rear O2's to the transmission mount. Logically, if they are out of the increased pollutant flow, they won't detect the increased polutants. No codes for me..Then again where I live we have no emissions testing to sneak past.

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I am actually going to try something like this. I went ahead and left the cats off and was planning on getting some simulators(to no avail yet). I am going to try your idea first and then I have also read that people have used anti-foulers(for spark plugs) to extend the O2 sensor out of the exhaust stream somewhat and do not get a SES light. Thanks for the thought.