Code P0455

Good afternoon,

I attached the possibilities for the code.

Are you sure about the year and engine? There was no 5.0 in 2007.

Roy

P0455
Descriptor
Probable Causes
After Market Evaporative Emissions (EVAP) System Hardware That Does Not Conform to Required Specifications
Canister Vent Solenoid Stuck Open
Evaporative Emissions (EVAP) Canister Tube Disconnected or Cracked
Evaporative Emissions (EVAP) Purge Outlet Tube Disconnected or Cracked
Evaporative Emissions (EVAP) Return Tube Disconnected or Cracked
Evaporative Emissions (EVAP) System Canister Damaged
Evaporative Emissions (EVAP) System Canister Purge Valve Stuck Closed
Fuel Filler Cap Damaged or Missing
Fuel Filler Cap Improperly Installation
Fuel Tank Pressure (FTP) Sensor Mechanically Inoperative
Fuel Vapor Control Valve Tube Assembly or Fuel Vapor Vent Valve Assembly Blocked
Fuel Vapor Hose or Tube Connections to Evaporative Emissions (EVAP) System Components Loose
Fuel Vapor Hoses or Tubes Blocked or Restricted

Hi there,
Sorry, 4.8, right? At the moment the code was given in the garage, they have a computer list attached in their program, which is the same list as you gave. We eliminated all the problems given by you. Most are ruled out because the smoke system was used. The car drives and handles like it should. Found out from the Mustang-club there are follow up codes, so 455, 456 and so on. Besides 'small' or 'giant' vapor leak, those codes each do not lead to one specific failure. The garage cancelled the dash light and it is off now. Last time they did that it came back after a few days.
Regards,
Kees

P.S. situated in the Netherlands, so not really Mustang country. Still, those codes seem the same for all nowadays cars.

Clearing does nothing. The light will return when it fails the 3 trip failure. It takes about a week.

How did they test the purge valve?

Roy

I have no idea. What does it do, and should I notice anything when it does not work properly?
Kees

It will not function. Did anyone test it individually to see if it is working?

It can pass the smoke test but fail the individual test.

Remove the hose from the valve, remove the electrical connector to the valve. Start the engine and see if you feel vacuum at the open port.

Let me know the result.

Roy

I know where it is located, and I will try your advice as soon as possible! Thanks on forehand!

You are welcome.

Keep us updated.

Roy

Hi Roy,
Just rang the garage, and they did not do as you suggested. As I have just been to the garage yesterday, they advised to drive for a while and see if the light comes on. If it does, we will follow your procedure. I will come back to that, might take a week.
Cheers,
Kees

It will return. They have done no repairs to the system. Clearing the light does nothing but make the PCM forget the code. After it fails the 3 trip test, the light will return.

Roy

Hello Roy,
2.5 weeks later, and 'no doubt' 3 trips later, still no yellow light.

Good.

Roy