Ford Edge P0451: EVAP Pressure Sensor → Range/Performance

As with all OBD-II Trouble Codes, P0451 The same meaning applies to all vehicles.  This means your vehicle is able to be identified by the symbol. Ford Edge‘s EVAP system has a pressure sensor that is malfunctioning in some way. 

A bad EVAP sensor, a clogged tank relief valve or fuel lines can cause P0451.  You may also have other reasons.  We’ll cover those directly below.

P0451 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….

Edge P0451 Signs

P0451 won't usually affect how your Edge drives or runs.  Fuel mileage It is possible that some people may feel a little bit of pain, although it's not likely to be severe. Service engine light will soon be on You will get one.  It is possible to also feel the slight The smell of gas. 

Make sure to pay attention to any other codes that may be EVAP related and then see if this helps.

P0451: Causes

Below are the main causes of P0451.

Bad/Missing Fuel Cap

To diagnose P0451, the easiest way to begin is by looking at your fuel cap.  Since a missing, bad, or under-tightened fuel cap can make your Edge throw this code it’s a great place to start.

If you’ve gotten a “tighten fuel cap” message recently, but the cap was already tight, that’s a strong indication that there could be something wrong with the fuel cap.

The rubber seal that surrounds fuel caps is where it comes in contact with the fuel receiver.  You should ensure that the seal isn't dry-rotted or broken.  It should be replaced if it becomes damaged. Capacity for new gasoline It may just be what you need in order to solve the problem.  However, fuel caps are often mistakenly attributed to the cause of P0451.

EVAP Lines and Wiring

Next, check the EVAP lines and hoses to see if they are causing your Edge's P0451.  Be aware of where these connect to each other, be near the exhaust and any objects that may slowly cut through them. 

The same principle would apply to checking the wiring harness.  It should be checked to make sure it is not damaged.  It is important to pay attention to how it connects with the EVAP sensor.  The harness may need to be replaced if it is damaged or loose.

It is possible that the carbon canister might be dangerous.

Bad Pressure Sensor for EVAP

This is a good time to inspect the fuel pressure sensor.  You’ll need a good scanner.  You’ll want to test to see if it is within the specs that Ford requires before getting a new one.  Here’s a fantastic video on how to do just that:

Oil Tank Pressure Relief Valve

If all else is fine, I might do a smoke check before checking the fuel-tank pressure relief valve.  These are often difficult to reach.  Here’s a link to a great video on how to Find the source of the leak if you don’t have a smoke machine.

Conclusion: Ford Edge, P0451

It can be difficult to find P0451.  The good news is that if that’s the only code that your Edge has, it shouldn’t really be a breakdown risk.

Please leave comments below if you have any suggestions.  We wish you all the best!