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Thread: ses code
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01-02-2008, 05:38 PM #1
ses code
i have a 01 ws6 ses light came on this morning stopped at auto zone code po420. is that a 02 or a cat when i first bought the car a cat whent bad but cant rember the code it was p somthing.
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01-02-2008, 05:46 PM #2
Quick google search came up with catalyst efficiency below threshold . So it could be a cat. They should have told you more when they pulled the code.
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01-02-2008, 06:31 PM #3
I had the same thing. I got a new cat under warrenty. GM sent me a letter extending the warrenty on the cats, which helped.
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01-02-2008, 06:34 PM #4
most likely a cat. Like was stated above, GM extended the cat warranty to 10 years 100k I *think*. Something like that. Wait until you get the code back again and take it to a dealership and have them swap it under warranty.
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01-03-2008, 10:15 AM #5
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- Jul 2005
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- Jacksonville, FL
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Yep, most likely the drivers side cat. Got the GM letter extending the cat warranty to 10yrs/120K on the 00-02 cars.
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01-03-2008, 05:00 PM #6
You shouldn't have to wait for the ses light to come back on. Because with the Tech 2 scan tool that the dealers have can read the code out of the memory of the computer. By the time I took mine into the dealer my ses light had gone out. Which is turned out by so many cycles of the ignition switch.
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