Rick's Free Auto Repair Advice

P0451 Evaporative Emission Control System

P0451 Evaporative Emission Control System Pressure Sensor Range/Performance

Evaporative emissions systems test for a leak in the fuel tank and associated hoses. To perform the test, the computer pulls a vacuum and checks to see if the vacuum holds. Each car maker uses a different technique to check, but most often it’s some type of fuel tank pressure sensor. This codes relates to a failure in that sensor. It’s either reporting an incorrect value, or is malfunctioning.

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© 2012 Rick Muscoplat

Posted on by Rick Muscoplat

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