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2003 suburban the engine light stays on and runs ruff when below 45 light never goes out until the weather hits 50 then light out no ruff runnin,,any ideas which sensor?
 

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RE: engine light comes on when cold outside

Dirty ait filter, maybe.

Causing map, maff or whatever it is called to send code.

Just a guess, also could be a bad O2 sensor, find someone with an OBII reader to be sure of ether.
 
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