Where is my emission system pressure sensor/switch located on my 08 ford escape

Question

I need to know where it's located and if I can replace it myself

Answer 1

P0451 Evaporative emission system pressure sensor / switch / range / performance

This is for the fuel tank pressure sensor, here is  a diagram use also this TSB # as a guide, it may relate for you

TSB 08-5-5

03/17/08

SLOW FUEL FILL AND/OR DTC P0451

FORD:
2005-2008 Escape Hybrid, Escape

MERCURY:
2005-2008 Mariner

2006-2008 Mariner Hybrid

This article supersedes TSB 07-25-7 to update the Title and Service Procedure.

ISSUE
Some 2005-2008 Escape, Escape Hybrid, Mariner and 2006-2008 Mariner Hybrid vehicles may exhibit a slow fuel fill concern or a malfunction indicator lamp (MIL) on with diagnostic trouble code (DTC) P0451 present. The condition may be caused by water/moisture or other contamination entering the fuel filler vent line and then freezing and/or causing a blockage.

ACTION
Follow the Service Procedure steps to correct the condition by relocating the fuel filler vent line.

SERVICE PROCEDURE

When performing this procedure it is not necessary to:

^	Drain any fuel from the tank
^	Remove the stone shield from the filler pipe
^	Disconnect the filler pipe from the fuel tank

NOTE ANY WATER/MOISTURE OR OBSTRUCTIONS IN THE EVAPORATIVE VENT SYSTEM MUST BE REMOVED.

1.	With the vehicle in neutral, position it on a hoist.
2.	Remove the left rear wheel.
3.	Remove the fuel filler cap.
4.	Remove the two (2) upper filler pipe mounting screws.
5.	Remove the single lower filler pipe mounting screw.
6.	Carefully pull the upper end of the filler pipe away from the inner wheel well to gain access to the vent line.
7.	Cut any tape or plastic straps holding the black plastic convoluted vent line to the filler pipe or underbody.
8.	Pull the black plastic convoluted vent line underneath the vehicle.
9.	Remove the vent line from the dust separator attached to the canister assembly and clear out the line using compressed air.
10.	Inspect the dust separator for water/moisture or any obstruction. If water/moisture or obstructions are present follow Workshop Manual (WSM), Section 310-00 pinpoint test A. If no water/moisture or obstructions are present reattach vent line to dust separator and continue to next step.
11.	Remove but do not discard the spider screen (vent cap) from the end of the vent line.
12.	Measuring from the open end of the vent line, cut off and discard the last 13" (35 cm).
13.	Reinstall the spider screen (vent cap) in the vent line.