zracer323

iTrader: (12)

Allright, so I finished my header install this week and evrything went pretty smooth. I started the car up (w/ only 1 O2 sensor) and it idled fine and ran good. But to my surprise, no check engine lights have come on. I've been driving it for a few days now and it still hasn't thrown any codes. Any ideas why?

Blazingz28

iTrader: (5)

Did you tune out the EGR/AIR codes + rear o2's with Hptuners? Not sure if you can do that but a possibility

Orange 02 WS6

turn the key to the on position with the engine not running and see if the light comes on, the bulb could burned out.

Brian2006

iTrader: (42)

The SES light has to be on. Either the previous owner ran LTs and tuned out the 02s and returned to stock, or the bulb is burnt out.

My guess is bad bulb

Camaroplus

I dunno... when I did LTs no light came on either... when I took it to be tuned someone had locked the computer... The only people that could have done that was Chevrolet when I took the car in to replace the cats... that may explain why it continued to run like crap after they replaced the defective cats.... If you had them replaced under warranty same thing could have happened to you... The tuned out all my o2s to avoid the warranty

primer84z

iTrader: (7)

it might take a while. Mine came on w/ cats and both sets of 02's hooked up after a couple weeks. You say you have HPTuners, disable the codes for all that **** anyway and dont worry about it.

Lt1Porsche

iTrader: (6)

i clear my light on a regular basis. once every month or so just to check what codes are there and after i clear mine it takes few days of driving before any code shows up. and that is with no rear o2s and no egr or air

99345hp

There is a certain number of error counts before the light comes on. Maybe you havn't reached that number yet? im not sure.

zracer323

iTrader: (12)

Well the bulb isn't burned out, so maybe I'll just give it more time. I planned on just tuning them out anyway but was just curious to why they didn't come on.

zracer323

iTrader: (12)

It just came on last night. Guess it just took it a little while.