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  #1  
Old 04-25-2011, 06:39 PM
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Default Code P0440

Pulled this code up on the meter today. Evap Emissions problem. I had the same problem on my mustang and had to replace the canister. Is this common for Dodge's too. I drove my mustang like that for almost a month before the engine light bugged the hell out of me. I like my cluster looking good with no lights. The wife calls me anal about it! LOL
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Old 04-25-2011, 06:54 PM
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I dont know about being common but it does happen.

Guess the first thing to do is make sure the gas cap is in good condition and secured tightly.
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Old 04-27-2011, 04:10 PM
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i have the same issue, my check engine light comes on about 400 to 600 after i reset it, i bought a new oem gas cap checked all hose lines going to the canister no cracks that i can see, and i still get the same check engine code, they say you need to have a smoke machine to see where the fuel vapors are escaping from. lmk if you solve your issue.
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Old 05-05-2011, 09:13 PM
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My 03 with 131K is doing something similar but is showing code P0441 in addition to P0440. I replaced the gas cap and after a few days the service engine light went out, but then a couple weeks later it came back on. Haven't tried anything else yet.
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Old 07-26-2011, 03:25 AM
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The new cap seems to have fixed the problem--no more service engine light. But, I'm wondering if the change to warm, dry summer weather has anything to do with that or if it's all due to the new cap.
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Old 08-14-2011, 01:21 PM
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I have heard of evap lines rubbing through on the bottom of the fire wall just food for thought
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Old 08-14-2011, 02:53 PM
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I have had the same issue before when I first bought my truck and at first they told me I didn't tighten the gas cap enough. Well, a few weeks later the check engine light came back on. They had to replace the canister.
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