check engine light
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New User
Joined: Mar 2004
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check engine light
My check engine light keeps coming on. But it only comes on when I fill up my gas tank. As long a there is less than 3/4 tank its ok. I have had the 02 sensor change about a year ago. It was about $300.00 at the dealer to get it changed. If I can help it I'll stay away from the dealer in the future. Any advise what it could be the problem.
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Joined: Mar 2004
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I have a 97 Explorer, 4.0L EFI V6 SOHC. About 2 years ago I had the fuel tank pressure sensor and the DPFE (?) sensor and hoses replaced trying to find out what the problem was. Now the light is back on again.
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More Info
Just came back from AutoZone where they checked my truck with the code tester. The code P0446 came up. EVAP system fuel tank pressure (FTP) sensor fault. Sounds like the same problem I had before. Any ideas why it keeps coming up. Is there any way to correct the problem without taking it back to the dealer($).
Elder User
Joined: Aug 2002
Posts: 886
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From: Cincinnati
I would find the tank electrical connector and unplug it, then reconnect it. Just in case there is a bad electrical contact. Bad sensor is uncommon and located in the tank. Sensor is 3 wire and you could probably check it. Dropping the tank is not fun or cheap. Evap leaks are more common and usually involve the solenoid above the spare tire that gets water damage.
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Senior User
Joined: Jan 2004
Posts: 111
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From: TX
Just a Question......Have you replaced your gas cap. If you have a bad seal on the cap, it wont hold pressure causing your check engine light to come on with that same code.
Just my $0.02
Just my $0.02
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