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Old 07-07-2008, 09:15 AM   #1 (permalink)
bennelson
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Join Date: Jan 2008
Location: Oconomowoc, WI, USA
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Pontiac Sunfire Check engine light PO440

Hi everyone,

I got a call this morning from my wife on her way in to work.

Her check engine light came on, so she pulled over and called me. We just happened to have a Scangauge hooked up, so I told her how to scan for the error code.

It was PO440. I looked that up and found that it is "P0440 Evaporative Emission Control System Malfunction".

What does that mean? It doesn't sound too bad. Could it be as simple as a loose gas cap?

I would like to be able to fix this myself, instead of sending it to a shop, but I am not sure where to start.

Any suggestions?

Thanks,

-Ben

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