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ses code

This is a discussion on ses code within the General Help forums, part of the LSx Technical Help Section category; i have a 01 ws6 ses light came on this morning stopped at auto zone code po420. is that a ...

  1. #1
    Junior Member guy's Avatar
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    blue/white
    2001ws6

    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.

  2. #2
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    2013 Infiniti G37

    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.

  3. #3
    Member Frozen WS6's Avatar
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    RED, BLACK
    2001 WS6, 1998 TA

    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.

  4. #4
    Veteran 0rion's Avatar
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    06 duramax

    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.

  5. #5
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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.

  6. #6
    Member Frozen WS6's Avatar
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    RED, BLACK
    2001 WS6, 1998 TA

    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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