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Old 12-29-2011, 09:36 AM
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code p0451, check engine light?

On my 2008 f350 with a v10 just had the check engine light come on. I hooked my scanner up to it and it give me a code p0451. I am just about to go on a trip today. Is it ok to drive it like this, what does this code mean. Thanks.
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Old 12-29-2011, 10:18 AM
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used google and put in P0451

Code P0451 evap emission control system
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Old 12-29-2011, 10:54 AM
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It's ok to drive. It just means that your fuel tank/cannister can't hold a vacuum when it tests for it. Or, not sensing a vacuum. That's how the computer detects if there is a leak in your fuel system. Could be as simple as a bad gasket in your gas cap.

It's almost like driving with your gas cap off. That light is annoying, though.
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Old 12-29-2011, 02:13 PM
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That happened to me and guess what.....my gas cap wasnt screwed on tight! That's all it was for me. Check that.
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Old 12-29-2011, 03:59 PM
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yep,it was a loose gas cap. Thanks guys.
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Old 11-26-2012, 12:22 PM
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p0451 code

Last year at emissions inspection I was told to get a new gas cap. I did, however, my check engine light came on. I had two mechanics check on the code and they said not to worry about it. Well, this year I failed the emissions test and went to another mechanic. He said I needed a Ford factory gas cap, which I purchased and put on. He reset the codes to ready and within a few hours the light was back on. Now the mechanic wants to drop (?) the gas tank to look for leaks. I am starting to get into real money on a 2004 suv with 128,800 miles on it. I called Emissions Control as directed on their website to see if there is a waiver or alternative and left two messages no return calls yet. My tags expire in 4 days. Any ideas?
Thanks,
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Old 11-26-2012, 08:03 PM
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Check the hoses near your charcoal canister for leaks or cracks. That is where I would start.
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Old 11-26-2012, 08:03 PM
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