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Discussion Starter #1
So on Saturday when I was on the Niagara run, my CEL turned on. Scanned it with my Bluetooth scanner and it gave me P0420. Cleared it and it's now off, though I still want it checked since I'm under GMPP.

Any way I can turn the CEL back on so dealer will look at it? I did give them the code in the appointment...
 

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Not if you cleared the code. Unless it goes off again.
 

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P0420 is the low catalyst efficiency DTC. It usually trips when the "downstream" or post cat O2 sensor detects a problem with the catalytic convertor.
 

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Discussion Starter #5

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Discussion Starter #6
Light's back on, and took her in. Yep, it's the cat.

And hooray for a coolant leak too!
 
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