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The fuel tank pressure sensor in a 2010 Ford Escape is part of the vehicle's fuel pump assembly. You will find it either inside the tank or mounted to the top of the tank. The P0451 code indicates that the EVAP system pressure sensor is malfunctioning in some way. This code is usually caused by either a bad EVAP pressure sensor, a clogged fuel tank relief valve, EVAP lines, EVAP wiring, or a bad fuel cap. If you have other EVAP related trouble codes, it is recommended to focus on them first and see if it helps remedy this one.
The P1451 code indicates that there's an issue with your vehicle's EVAP systems vent solenoid. The engine control module (ECM) looks for a change in the EVAP system pressures to validate that the EVAP vent solenoid has actually opened or closed the vent.
Here is the definition of the code. Could be a faulty gas cap, a leak in the evap venting system, a wiring problem, or a faulty vent solenoid. Something caused the system to fail a pressure test.
P1451 FORD Description
The Engine Control Module (ECM) detected the canister vent solenoid signal moved outside the calibrated parameters at a specific duty cycle. Read more: http://engine-codes.com/p1451_ford.html#ixzz27jBna9sq
P0171 - System too Lean (Bank 1)
P0174 - System too Lean (Bank 2)
P1451 - EVAP Control System Canister Vent Solenoid Circuit Malfunction
I'm afraid I don't have enough info to tell you how to fix the P1451 but I'm certain it's the cause of the other two codes.
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