Question about Dodge Ram Pickup 1500

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P0442 code on 02 ram 1500

This code and check eng light showed up when i started truck today was fine yesterday as i traveled over 400 km.

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It is a vacuum leak from the engine to the gas tank. Did you leave of the gas cap. May just be a faulty gas cap. Filler neck could be cracked. Check hoses going to tank for cracks. To test the gas cap you can place a plastic bag on it and screw it on. You have to drive 20-50 miles to clear code.

Posted on Jun 15, 2009

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P0455 P0442 codes 2001 dodge ram 1500


P0442 Means you have a small leak in your EVAP system. P0455 is a large leak.
The EVAP system prevents gas vapors from entering the air .
This code can be set by a leak in the lines or a clogged charcoal canister.
Most common reason is If you did not put your gas cap on all the way.
Hope this helps
Leave feedback please
thank you FixYa

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I have serv eng light on with code # PO172 , PO128 , and PO442 , and I replaced fuel tank cap today , light still on ,and I need to get inspection , but I am out of work and can't afford expensive repair...


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You can see my TIPS on this site to help with the MAF.
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P0442 means you have a small leak in your EVAP System. your can try replacing the Gas cap since it's the easiest thing to do and reset the check engine light with a scanner. If the check engine light came back on then your going to have to go though all the Vacuum line in the EVAP system and connections. The other thing too is the service engine light should turn off when the problem is addressed and it may take up to three start ups to clear. Good luck and keep me posted, be glad to help, Recap, change the gas cap and inspect all the hose and connection's to the EVAP system.

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