[LarryB]

Check engine light is on. Had code read and P0455 came up "a large leak in the fuel vapor system" I need to know where the carbon canister, the fuel tank pressure sensor and the canister purge valve are located on a 2000 mustang convertable so that I can check them out.

Thanks to Jorge in directing me to the correct place to post this as I am a new subscriber.

 

[WhiteStang99]

Re: Diagnostic code PO455

Can't help you man. :dunno:

but *bump*

 

[bigpomps]

Re: Diagnostic code PO455

try twisting the gas cap when you put it back on. the vapor leak is usually due to the gas cap not being fully tightened when you put it back on after fueling up. make sure that it clicks.

 

[SpectorV]

Re: Diagnostic code PO455

go to autozone and get the codes read they will tell you what they are

 

[lowflyn]

Re: Diagnostic code PO455

go to autozone and get the codes read they will tell you what they are

He already did that...

 

[95gt350]

Re: Diagnostic code PO455

did u check da gas cap i know it sounds dumb but it happens

 

[slvr2000stang]

Re: Diagnostic code PO455

: P0455 - EVAP Control   : The PCM monitors the   : *  After-market EVAP   : Check for audible      :
: System Leak Detected   : complete EVAP control  :    hardware (such as   : vacuum noise or        :
: (No Purge Flow or      : system for no purge    :    fuel filler cap)    : significant fuel odor  :
: Large Leak)            : flow, the presence of  :    non-conforming to   : in the engine          :
:                        : a large fuel vapor     :    required            : compartment or near    :
:                        : leak or multiple small :    specifications      : the EVAP canister and  :
:                        : fuel vapor leaks. The  : *  Disconnected or     : fuel tank.             :
:                        : system failure occurs  :    cracked fuel EVAP   :
:                        : when no purge flow     :    canister tube, EVAP :
:                        : (attributed to fuel    :    canister purge      :
:                        : vapor blockages or     :    outlet tube or EVAP :
:                        : restrictions), a large :    return tube         :
:                        : fuel vapor leak or     : *  EVAP canister purge :
:                        : multiple fuel vapor    :    valve stuck closed  :
:                        : leaks are detected by  : *  Damaged EVAP        :
:                        : the EVAP running loss  :    canister            :
:                        : monitor test with the  : *  Damaged or missing  :
:                        : engine running (but    :    fuel filler cap     :
:                        : not at idle).          : *  Insufficient fuel   :
:                        :                        :    filler cap          :
:                        :                        :    installation        :
:                        :                        : *  Loose fuel vapor    :
:                        :                        :    hose/tube           :
:                        :                        :    connections to EVAP :
:                        :                        :    system components   :
:                        :                        : *  Blockages or        :
:                        :                        :    restrictions in     :
:                        :                        :    fuel vapor hoses    :
:                        :                        :    /tubes (items also  :
:                        :                        :    listed under        :
:                        :                        :    disconnections or   :
:                        :                        :    cracks)             :
:                        :                        : *  Fuel vapor control  :
:                        :                        :    valve tube assembly :
:                        :                        :    or fuel vapor vent  :
:                        :                        :    valve assembly      :
:                        :                        :    blocked             :
:                        :                        : *  Canister vent (CV)  :
:                        :                        :    solenoid stuck open :
:                        :                        : *  Mechanically        :
:                        :                        :    inoperative fuel    :
:                        :                        :    tank pressure (FTP) :
:                        :                        :    sensor              :

 

[LarryB]

Re: Diagnostic code PO455

To all of you that replied to my thread on code PO455:

IT APPEARS THAT MOST OF YOU DID NOT REALLY READ IT. IT STATED THAT I HAD ALREADY CHECKED THE CODE AND IT IS PO455. I NEED THE PHYSICAL LOCATION OF THE PARTS LISTED. I HAVE CHANGED THE GAS CAP ALREADY.

DOES ANYONE ACTUALLY GO UNDER THEIR CARS TODAY AND DO ANY WORK ON THEM??

 

[SpectorV]

Re: Diagnostic code PO455

calm it down a few notches

 

[slvr2000stang]

Re: Diagnostic code PO455

Some of it is in the pass side wheelwell some by the gas tank.

 

[WhiteStang99]

Re: Diagnostic code PO455

Yeah, that's a problem a lot of people on this site have. I had a code read and got the same responses from the same people.

 

[LarryB]

Re: Diagnostic code PO455

Thanks for the leads. I found the carbon canister in the drivers side rear well but found nothing in the front passenger side. I'll keep looking.

LarryB

 

[LarryB]

Re: Diagnostic code PO455

You are right!! Just have been burned a lot on another site by people that just seem to want to be seen on the internet and not really help a guy out. I'll behave better in the future.

 

[slvr2000stang]

Re: Diagnostic code PO455

Canister purge valve in a 2000 is located in the right front inner fender well.
The tank pressure sensor is above the fuel tank.

 

[lowflyn]

Re: Diagnostic code PO455

Sometimes we get so caught up in trying to answer all the questions we don't have time read them right lol. At least you've got the right info now. Keep us updated with what you find.

 

[redfire2003]

Re: Diagnostic code PO455

did you by chance refuel with the car still running?

 

[LarryB]

Re: Diagnostic code PO455

I'll report back when I get some time after the holidays and the arrival of our first grandbaby! The light has been on for 6 months now with no ill effects so a few weeks longer won't hurt At least now I have a starting point.

 

[Joel5.0]

Re: Diagnostic code PO455

I'll report back when I get some time after the holidays and the arrival of our first grandbaby! The light has been on for 6 months now with no ill effects so a few weeks longer won't hurt At least now I have a starting point.

I would dare to suggest that before you do any checking or troubleshooting, reset the ECM and check if it shows up again. Some of these evap codes show up once (due to causes you have read already) and may have been corrected (the new gas cap). I'm assuming a reset was not done after you changed the gas cap,.....if you did.......troubleshooting is required. GL

 

[LarryB]

Re: Diagnostic code PO455

I would dare to suggest that before you do any checking or troubleshooting, reset the ECM and check if it shows up again. Some of these evap codes show up once (due to causes you have read already) and may have been corrected (the new gas cap). I'm assuming a reset was not done after you changed the gas cap,.....if you did.......troubleshooting is required. GL

Thanks for the comeback. I have reset the ECM by disconnecting the battery overnight. I did this both after the code was read intially and after the gas cap change. After about one week the light returned. I am hoping that wat I did was good enough to reset the ECM if not what should I do?

 

[WhiteStang99]

Re: Diagnostic code PO455

Yeah, that would cover resetting the computer. It actually only takes like 5 minutes, but overnight doesn't hurt.