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2002 Saturn service engine soon light back on


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Patricktm48
New User

Mar 28, 2014, 12:06 PM

Post #1 of 3 (852 views)
2002 Saturn service engine soon light back on Sign In

This light (OBD reading PO440) went out after replacing gas cap. It came back on 2 days later right after I replaced the AC compressor. The AC worked fine but the light came back on and the engine started misfiring about 5 miles down the road. Turning off the AC solved the misfiring but the light is still on and summer is approaching. Still same OBD reading PO440.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 28, 2014, 12:34 PM

Post #2 of 3 (838 views)
Re: 2002 Saturn service engine soon light back on Sign In

The P0440 has nothing at all to do with engine performance. You have a problem with the Evaporative emissions system and it will likely have to be smoke tested.



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kev2
Veteran
kev2 profile image

Mar 28, 2014, 1:26 PM

Post #3 of 3 (827 views)
Re: 2002 Saturn service engine soon light back on Sign In

tell us which model and engine, MAYBE just maybe your AC repair did something to the PURGE valve ...

the generic nature of P0440 would call for the procedure HT suggested, and a scanner but I am an optimist






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