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Old 07-11-2012, 06:50 PM   #15
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I had the same issue. I tightened the gas cap to many clicks, then I removed the negative battery cable and let it sit that way over night. Next morning I reattached the cable. That reset the computer. No more warning code.
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Old 07-17-2012, 06:05 AM   #16
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1975 27' Overlander
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Originally Posted by funkill View Post
Would you drive and/or tow with this condition? Thanks for your thoughts on this!

Laura


Yes, I have for years! My tow vehicle has a chronic P0400 code condition. It doesn't affect ecoconmy, reliability or drivability, so I've never bothered to deal with it.


Ironically, if I clear the code it never reappears while towing, only in warm weather solo.
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Old 07-18-2012, 11:18 AM   #17
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Soooooooooo - the CEL continues to come on, then go off intermittently. I will be in town this afternoon and will pick up a new gas cap to see if that resolves the problem once and for all. I Googled the problem and found one post that said *dusty roadways* could affect the P0400 code. Hummmm, I certainly have that condition - dusty is almost an understatement. For now, I won't freak about the condition. But will need another smog test in a few months and I'll investigate further if the light is still illuminated!

Laura
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Old 07-18-2012, 11:27 AM   #18
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My Ranger had a cracked fill hose on the gas tank thanks to ethanol in the gas. You might want to check that. If you smell gas look for the source. I would not worry about that particular code. You can reset code with the code reader instead of resetting the whole computer. There is usually a training period everytime you reset the computer. It fine tunes the engine and transmission for the best performance. If you keep resetting it, it will constantly be in a tuning mode and may not drive as well as usual.

Perry
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Old 07-23-2012, 04:27 PM   #19
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Fixed! I stopped to purchase a new gas cap and, upon closer inspection of my original, I realized it was filled with dust. Couple blasts of air to blow out the crud and now the CEL is OFF!

Laura
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