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OBD-II P0442 help

tsmith98
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tsmith98 Member

tsmith98

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I just got the CE light which in turns out to be the P0442 code. The description is "Evaporative Emission Control System Leak Detected (small leak)" but what is it really?

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Tool Pants Member

Tool Pants

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The book says it is for detecting leaks in the fuel tank ventilation system. And that there is a problem with a line or 1 or 2 valves

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Tool Pants Member

Tool Pants

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From my high school auto shop days.

Vapors from the fuel tank are collected in a cannister. When the car is running these vapors are sucked into the intake and burned. US law requires an onboard system to determine if there are leaks in the emission system. A vacuum is created in the tank and measured with a pressure sensor to determine if you have a bad line or valve(s) for the emission side of the tank. There is a valve to open the cannister and a valve to close the system so that vacuum can be built up.

So with that code the book says you are to check the lines and valves for leaks. Like when you forget to put the gas cap on and get a check engine light.

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