Service Engine Soon Light

The Service Engine Soon light on my Camaro came on this morning once I got to where I was going I stop the engine and check all my fuilds and gas Cap everything ok. I started the car backup and the light was off. It stay off
all day until just now I went to the store and it came on again. Anyone knows what can cause this to happen. I thought once that light came on the only way to turn it off is with a scan tool.
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Maybe you should be less worried about the light being on, and more worried about WHY the light is on. A scan tool will normally allow you to turn off the light, but more importantly will tell you which codes are stored so you can start to troubleshoot.
On Thu, 20 Jan 2005 19:11:54 -0500, "kraemer94"

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It also helps to know what year Camaro and the engine size. Joe--ASE Certified Parts Specialist & 10th Ann.Club Tech Director '80 Carousel Red Turbo T/A, 27k orig. '79 "Y89" 400/4 speed 10th Ann. T/A, 57k orig '84 Olds 88 Royale Bgm 2 dr, 307 "Rocket" (lol), 143k and still going....
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1995 v6 3.4
Thanks
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if i had to just make a super wild guess....at this point im thinking O2 sensor or mass air..... with all the info you supplied thats my guess... All aboard the Yankee express, next stop October.....
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I'm thinking more is wrong. I stop At two local auto parts stores and When they try to link the scan tool to the car computer it kept giving linking errors. Monday I guess I will bring it in the the dealer ship.
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I found the problem Error code 77 EGR Valve.
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The first thing to check is to make sure the vacuum hose to the EGR is in tact. If you end up buying a new EGR, I would recommend getting one from the dealer. Aftermarket EGR's tend to be more of the "one size fits all" type and rarely work as well as factory units.
Gary

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You can replace it yourself. Got to http://lst.com/ under either the LS1 or LT1 forum and search the archive keyword EGR. There is a selinod before the EGR, replace that to.
Had the same trouble on my 1995 LT1 TA, But, the dealer said if it comes and goes, don't worry. When it will not go out at all, come in.
Depending on your local EPN rules and year, as long as the SES light is out at the time of inspection, your OK. But 1996 and up with OBDII, the codes get scanned, your toast to fix it.
Change gas (Sunco 93) and take a 20 mile drive at 65 or the max speed limit, a good long fast run will clean it out.
Good luck.
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