Question about 2006 Ford Freestar
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Posted on Jan 02, 2017
This is the most common code we see in my repair shop.
The description of this code is "small leak detected-evaporative system".
The reason for it all is emissions. In vehicles produced in the last several years there is a system in them that is capable of storing gasoline vapors (hydrocarbons). When filling your fuel tank vapors are now directed to a vapor storage device called a carbon canister. When driving your car under certain driving conditions these vapors are drawn into the engine to be burned.
So in order to get the vapors into the canister the fuel system must be sealed. So the systems in vehicles will sometimes run a test to verify that the system stays sealed, if it doesn't, your check engine light comes on.
A loose fuel cap can do this, but so can a rusted line, a bad solenoid, cracked carbon canister and so on.
One of the best ways to locate a leak that isn't obvious is to use a smoke generating devise and introduce it into the evap system.
Many good shops will have a smoke machine today. If they don't I am sure they pull their hair out trying to fix this code.
I hope yours is a simple fix.
Posted on Nov 24, 2009
Continuous Memory Diagnostic Trouble Code (DTC) P0442 indicates that a fuel
vapor leak has been detected [as small as 0.10 cm (0.04 inch)] in the
Evaporative Emission (EVAP) system.
Note: Prior to performing the following diagnosis inspect the Canister Vent Solenoid (CV) for contamination. A situation may exist where contamination holds open the Canister Vent (CV) solenoid enough to set DTC P0442 and also plugs the port to atmosphere enough to keep system from being vented quickly.
Posted on Jul 26, 2008
NUMEROUS THIS CAQN CAUSE THAT LEAK.U NEED TO FIL THE SYSTEM W/ A SKOKE MACHINE AND FIND THE LEAK WHERE SMOKE IS COMMING OUT.GOOD JOB FOR A SHOP
Posted on May 07, 2009
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