I need my ses light back on

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May 16, 2007 | 03:13 PM

NHRA Trans Am

Thread Starter

Staging Lane

Joined: May 2006

Posts: 64

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From: NJ

I need my ses light back on

About a week back my SES light came on so I took it to my friend,s dad who works at a ford dealership and he had one of the guys there run a scan on it, and he said that the cat eficency in both cats is below normal and they should be replaced.So i made an apointment with my pontiac dealer and ready to go but before i did i wanted to use my hypertech tuner to put the tuning back to stock, but when i did i acidentaly cleared the codes. So when I went to the daler they said they cant do any thing if there is no code. I read if you drive your car through a Diagnostic cycle it will come back on, but that could take up to 10 cold and warm starts. I want to get the cats replaced soon is there any way to get the SES light on sooner?

May 16, 2007 | 04:02 PM

2001NBMZ28

TECH Senior Member

Joined: Dec 2001

Posts: 5,399

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From: Jacksonville, FL

I'd think the dealer could tell if they're bad just by scanning the car? Guess a few drive cycles wouldn't hurt - www.obdii.com/drivecycle.html Look up when the MIL comes on for P0420 and P0430 for your year at gearchatter.com, thinking they might come on as soon as it sees a failure. You did the right thing by returning the tune to stock before letting a dealer connect.

May 16, 2007 | 04:35 PM

NHRA Trans Am

Thread Starter

Staging Lane

Joined: May 2006

Posts: 64

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From: NJ

Quote:

Originally Posted by 2001NBMZ28

As far as i know the cats are bad, i just need the code to come back up so the dealer will fix it, can i disconnect one of the O2s and get the same code?and why do you have to return it to stock when you take it to the dealer?

May 16, 2007 | 04:55 PM

2001NBMZ28

TECH Senior Member

Joined: Dec 2001

Posts: 5,399

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From: Jacksonville, FL

Disconnecting the 02s isn't going to get the same code(s) back. They still may be stored in history, but don't know if HPP3 resets all the codes when changing tunes back and forth. Reason you want to return the car to stock before visiting the dealer is they may upgrade/change the PCM programming. I'd just put some miles on it and wait for the codes to come back.

May 16, 2007 | 04:59 PM

NHRA Trans Am

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Staging Lane

Joined: May 2006

Posts: 64

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From: NJ

thanks for the help

May 16, 2007 | 10:29 PM

89TransAmWS6

Teching In

Joined: Nov 2006

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Or just relax and dont worry about it..

Does the car actually show any signs of a bad cat? A bunch of things can set that code, and it doesnt hafta be the cat.

I cant tell you how many times ive reset the computer in cars and the light never came back on.

Just dont dive into a cat replacement if you dont need to.

joe

May 21, 2007 | 04:57 PM

Street Lethal

On The Tree

Joined: Jul 2005

Posts: 191

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From: Old Bridge "Raceway Park" N.J.

Quote:

Originally Posted by NHRA Trans Am

I want to get the cats replaced soon is there any way to get the SES light on sooner....?

Had a similar situation a few years ago with my wife's LS1. Dealer wouldn't touch it without an SES light prevalent, and I accidentally cleared the codes by disconnecting the battery before-hand. However, knowing that the original code was in fact stored in the PCM (despite the SES light being off), I disconnected the O2 sensor harness, waited for Closed Loop, SES light was triggered, then off to the dealer I went. When they scanned for codes they found the original one, along with the disconnected O2. My comment to them as they looked at me in suspicion was, "hmm, I wonder how that could have happened"....