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Q:

where is the exact location in the engine the evaporator system sensor switch on 2007 Ford Freestar

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
code p0451
(2) Answers
P0451 Fuel Tank Pressure Sensor Circuit Offset/Intermittent
Possible Causes Setting Conditions

FTP sensor connector is damaged (check pins for damage, and for moisture)
FTP sensor signal circuit has an intermittent open condition
FTP sensor signal circuit has an intermittent shorted condition
FTP sensor has failed
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