Ses
Thread Starter
Teching In
Joined: Jun 2008
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Ses I was cruising around 30mph monday and my SES light comes on, I don't think it is too big of a deal because i don't hear any strange noises and there is no change in performance. Any ideas on what could be setting it off? It a 1998 TA A4 with 59xxx miles. Thanks
Thread Starter
Teching In
Joined: Jun 2008
Posts: 17
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i finally got my pcm scanned at autozone and this is what is said, low efficiency catalytic converter bank 2, it said this could be due to either a bad cat, a vacum leak, and oil spill into the exhaust, or a O2 that needs replacing. I am leaning toward the O2 sensor because i do not hear any new noises nor do i smell any odors. Am i correct in this judgment? Also my SES light has been on since the first post but suddenly tonight it went of and then after about two hours it came back on. What could be causing this?
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TECH Senior Member
Joined: Dec 2001
Posts: 5,399
Likes: 3
From: Jacksonville, FL
Sounds like a bad passenger side cat, code was probably P0430. Have the code checked again to be sure it's not something else since the light went off then on again. You can check the post cat 02, exhaust for leaks, etc. but it's usually the cat. www.gearchatter.com/viewtopic8708.php
I had this problem about a month ago. Same code and everything. It was bs... i haven't reset the CHANGE OIL light for about 5 or so oil changes... i threw the light on and it freaked me out for a while. So i changed my oil, and finally reset the counter.. and the light never turned back on. Hope that's your case...
On The Tree
Joined: Feb 2006
Posts: 110
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I had this problem about a month ago. Same code and everything. It was bs... i haven't reset the CHANGE OIL light for about 5 or so oil changes... i threw the light on and it freaked me out for a while. So i changed my oil, and finally reset the counter.. and the light never turned back on. Hope that's your case...
The code he's having can go off on their own or cleared with a scanner and not come back right away or for a long time, b/c it would depend on how bad the cat was clogged. The clogging could be minor and maybe the small obstruction was expelled.
GM sent out a TSB (technical service bulliten) on 01 and 02 LS1 fbodys about coming out of the factory with bad cats. Emissions are covered for 10 year/100,000 miles if it isn't modded at all. I would think it would be a o2 though. O2s are supposed to be changed out like sparkplugs, just no one does it.
This might help a little.
http://www.obd-codes.com/p0430
I would start by swapping the rear o2 sensors or buy a new one and try it. If the code changes after switching them to the other side then bad o2, or light doesn't disappear afterwards with the new one=Bad cat. Since the light is intermittent, it will most likely be a bad o2.
http://www.obd-codes.com/p0430
I would start by swapping the rear o2 sensors or buy a new one and try it. If the code changes after switching them to the other side then bad o2, or light doesn't disappear afterwards with the new one=Bad cat. Since the light is intermittent, it will most likely be a bad o2.
