Rotten Egg Smell and SES light [Archive] - Forum


View Full Version : Rotten Egg Smell and SES light

02-05-2004, 02:55 PM
I had the SES light come on, went to autozone to get it read, and got a 404 or something code, regarding the exhaust, the guy almost noticed the rotten egg smell, so it must be the catalytic or the O2 sensor? I did a search for rotten egg smell, and no one mentioned the SES light comming along with the Catalytic being bad, How would the computer know when the cat goes bad? So can the O2 sensor trigger the light and cause the bad mixture? The car is stock besides a WAI, the only different is putting 93 octane last time I got gas. The car has about 33k miles on it.

02-05-2004, 03:34 PM
yes the cat did probally go bad!! your check engine light is on because there is a O2 Sensor after the cat and it is probally going crazy with all the bad exhaust gas going by!

02-05-2004, 03:39 PM
I saw someone mention that GM covers it up to 80,000 is that true?

02-05-2004, 03:49 PM
It should say in your owners manual. I believe it is 60k or something near it.

02-05-2004, 04:00 PM
cant find nothing in my manual :\

I called GM and they said 80,000 miles on the Catalytic and PCM. So u guys deff think its the catalytic?

02-05-2004, 10:25 PM
that's what i would think too

02-06-2004, 04:27 AM
So u guys deff think its the catalytic?

Yes, but the problem is WHAT caused your cat to go bad. Your car is only a '99, not that old. Chances are your car is running really rich for some reason, as that kills cats very quickly. So you're going to have to have them figure out why you're running rich (if that's the problem). If you just replace the cat, it'll more than likely go bad again until you find out what is the root problem.

02-06-2004, 05:49 AM
the infamous phrase..."sh** happens" is what caused it to go bad more then likley, you have a 8 year 80,000 mile warrenty on the converter so go get a new one!

02-06-2004, 06:18 AM
I'd be tempted to replace the O2 sensors too, just to be safe.

02-06-2004, 06:46 AM
are they going to say my WAI caused it to go bad?

02-06-2004, 11:56 AM
I have the rotton egg smell to. I dont think it is the cat though because it is a brand new carsound highflow cat that is about 5 weeks old. I dont have any lights though.

02-06-2004, 11:57 AM
Originally posted by djrkd
are they going to say my WAI caused it to go bad?

i will bet 5 bux they do

it's only a WAI...swap it back to stock b4 you take it in

02-06-2004, 11:58 AM
if its not the cat, there gonna make me pay 90$ just for lookin at it, I really dont wanna waste the money.

02-06-2004, 01:25 PM
just got back from midas, they said its not the cat.

02-06-2004, 01:37 PM
did they tell you what it is...or just what it's not

02-06-2004, 01:47 PM
Yeah what they say?

02-06-2004, 01:51 PM
they said they dont know, im gonna remove the O2 sensor, see if it looks bad. The smell is gone though.

02-06-2004, 02:56 PM
I get the smell only once in awhile and its for only like 30 seconds then it goes away.

02-06-2004, 03:10 PM
do u have any mods?

02-06-2004, 03:36 PM
Um yeah.
Recent addiction SS headers. My cardomain isnt updated yet so they arent in there.

02-06-2004, 03:37 PM
i see, im worried i wont be able to pass inspection this month.

02-06-2004, 03:44 PM
Thats gotta suck to live in a state that has that inspection crap. I dont have a O2 sensor or air tube in my cat, would i pass your states inspection?