code p0450

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May 18, 2013 | 08:17 PM

bigunit54

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Joined: Apr 2010

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code p0450

Hi guys, problem on my wife's 06 Mountaineer, 4.0. Couple months back the loose gas cap light came on out of the blue. I bought a stant gas cap and cleared the code, no problems. Well about 2-3 weeks ago it threw code 0450. One of the things I saw it could be was the fuel cap. So I ordered a new Motorcraft fuel cap this time and cleared the code. Ran it about a week and the light came back on. No change is performance, mileage, and no fuel smell. So, I don't know what the problem is. Found this website:
OBD II Code P0450

It says that a common misdiagnosis is the fuel cap. Says that it is most likely a defective sensor or something. Anyone got any experience with this? Anyone had to change the fuel tank pressure sensor? ANY advice on this is much appreciated! Thanks

May 19, 2013 | 07:35 PM

shorod

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Joined: Jun 2009

Posts: 4,818

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From: Cedar Rapids, IA

Depending on how many miles are on the truck, you might want to pursue if this code would be covered by the extended "emissions" warranty. I don't recall the details, but it's something to the effect of components that impact emissions need to be covered for a minimum of 8 years or 80,000 miles. I'm not sure if that covers only parts or parts and labor.

-Rod