I recently got a check engine light on my truck (97 F150 4.2V6). I hooked up a OBD II scanner and the code it gave me is P1450. I can't find the meaning of this code. I have looked in the owners manual for the scanner and in a maintenance manual for the truck. If anyone has any idea what this means please let me know so I can correct the problem. Thanks Ken

 

P0446 or P1450 indicates that Self-Test has detected the Evaporative Emission Control System has excessive fuel tank vacuum

Possible causes:

EVAP canister purge outlet tube (EVAP canister purge valve to EVAP canister) blockages or kinks.
EVAP canister tube (fuel tank to EVAP canister) blockages or kinks.
Fuel vapor elbow on EVAP canister contaminated.
Restricted EVAP canister.
Canister vent (CV) solenoid stuck closed (partially or fully).
Plugged or contaminated CV solenoid filter.
EVAP canister purge valve stuck open.
Fuel filler cap stuck closed (no vacuum relief).
VREF circuit open in fuel tank pressure (FTP) sensor.
Damaged FTP sensor.

easiest thing would be a gas cap but most times wont fix it. there was another guy here recently that was getting a code that indicated a bad fuel tank pressure sensor. so its hard to guess but i hope this gives you some idea of possible causes and things to check.

 

Thank you very much, that helps alot. At least I have an idea of where to start looking. Will keep you posted as to what I determin it to be. Ken