Question about 1996 Ford Aerostar Extended

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Check engine light comes on code says 1442 if i remember right something about the evap in gas tank..Is that right or can I just try changing the gas cap

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I would try new cap first then go from there

Posted on Nov 12, 2010

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Code 456 is a common code for a small leak in the evap system. The evap system is how the computer vents gas fumes from the gas tank.
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that is the evap sensor failure. it can be multiple things. gas cap allows it to come on sometimes. delete the cel and see if it comes back on. if it does it can be the evap sensor located on top of fuel tank, thereis a charcoal filter located in there somewhere that filters the gas fumes before it exits into the environment. with the work involved to drop the gas tank and everything, it is easier to replace all of it once you have it apart. that way you dont just change the sensor and put it all back together and it be something else.

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Getting a smoke test is the right direction to go in.
The computer vents the gas tank to the vapor canister while the engine is running. It also pressure tests the system for leaks. Some where between the gas tank and the vapor canister there may be a leaking hose or valve. Or it could be the gasket on top of the tank where the pump assembly went in.
The gas cap could have been a source for the leak, the other things are not involved.

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My check engine light came on code P0446; dashboard says "check gas cap" i took it off retightened it and check engine light still on. I noticed that the metal flap for the gas nozzle is...


The metal flap should not trigger the sensor. Once you tighten the gas cap you should clear the code and see if it comes back. Otherwise it will take a while to go away.
If it does come back even though the gas cap is tight it could be the rubber seal around the gas cap replacing that can sometimes fix this issue also.

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The engine light comes on. When the gas tank is


Most likely an EVAP code. Need to scan it to get the specifics.

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i believe that is an evap system leak,i cant remember if its large or small,check yur gas cap for damage and make sure its tight

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2000 cavalier check engine light code po440


P0440 - Evaporative Emission (EVAP) System


evaporative emission (EVAP) system has a large leak.
Check the gas cap or vent valve. these are the most common problems.


The Powertrain Control Module (PCM) at different times performs various tests on the EVAP system. OBD II Enhanced EVAP systems are in place to keep fuel tank vapors from venting into the atmosphere, and instead purges them into the engine to be burned. Regular pressure tests are conducted by the PCM to monitor the sealed system for leaks. The PCM monitors the EVAP system pressure by watching the Fuel tank pressure sensor (FTP). When the sensor indicates a small leak in the EVAP system, this code is set.


Here are some additional causes.

* A small leak in any of the EVAP hoses or fuel tank hoses
* A small leak in the purge valve or vent valve
* The EVAP Canister may be leaking

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Check engine light/gas cap will not stay tight.


Yes, the gas cap will cause the Check Engine Light to come on. Will set code P0441 if I remember correctly. It should be okay to drive it. If you would like to confirm the code, take the truck to an auto parts store like Autozone and have them hook up their scan tool and read the code. If its P0441 it will probably be something like EVAP or Evaporative system leak.

Its an easy enough fix while your there too, just pick up a new gas cap or you could pick up an OEM one from the dealership.

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