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The Original A D M I N
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18,797 Posts
well that is pretty broad.

what were you doing right before it happened. How many miles do you have. Did it come on when you started the truck or just while driving?


Just asking why it came on without letting us know what you were doing or had done previous does not help.

the SES light is the computer telling you something has happened. But it has so many codes that it could be anything from an o2 sensor that is running lean to long and set the SES off. To that your spark timing is way off....to a knock sensor failing...it can be anything.


If you have a diagnostic scanner i would suggest scanning it getting the code. If you do not take it to someone that does. I know that some dealers will scan your system for free and clear your codes for free if there is not a true problem.
 

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I GOT BLING-BLING
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607 Posts
Discussion Starter #3
Lets see--

-66,xxx miles

-put a magnaflow muffler on 2-3 weeks ago

-best I can remember, it was when It was started





-----Could it be an airfilter possibly?
 

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5 Posts
One other thing to check is that your egr is functioning properly. Sometimes you can get an intermitent SES light if it doesn't open. Does it reset if you turn the truck off then back on? My .02
 
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