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Old 02-01-2013, 03:52 PM   #1 (permalink)
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Default OBD II code po445

Hi all, my 2001 Taurus keeps showing OBD engine code po455.Does anyone have knowledge of this problem? and if so, how did you solve the problem? Thanks! Sorry it was po455

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Old 02-01-2013, 04:14 PM   #2 (permalink)
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P0445 has to do with the evaporative system and could be something as simple as a loose or leaking gas cap. Check that first. If the cap is good (new) and you still have the problem after clearing the code, there is a leak somewhere in the fuel system involving the filler tube, tank, filter or evaporative canister and sensors.
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Old 02-01-2013, 04:18 PM   #3 (permalink)
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Ok, thanks. I mistakenly put po445 but is po455, is there any difference? Sorry for the mistake
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Old 02-01-2013, 04:27 PM   #4 (permalink)
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P0455 is definitely gas cap related. Check to make sure it is tight and that the seal is not worn or missing.
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Old 02-01-2013, 04:30 PM   #5 (permalink)
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Quote:
Originally Posted by willysr121 View Post
Ok, thanks. I mistakenly put po445 but is po455, is there any difference? Sorry for the mistake
P0455 OBD-II Trouble Code


Evaporative Emission Control System Leak Detected (no purge flow or large leak)
What does that mean?

This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
Symptoms

You likely won't notice any drivability problems.
Causes

A code p0455 most likely means one or more of the following has happened:
  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • Other leak or damaged piece in EVAP system
Possible Solutions

With a p0455, the most common repair is to:
  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, and/or
  • Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary
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Old 02-01-2013, 04:40 PM   #6 (permalink)
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Thanks for your help, I am planning to replace the gas cap, as I'm sure it's old. If the code comes back, what would you recommend next?
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Old 02-01-2013, 04:51 PM   #7 (permalink)
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There may be leaks in the fuel filler neck. Basically, there is a sensor that is detecting a lack of pressure within the fuel tank emissions system and signalling this to the engine management computer. Very possible a new cap will fix this, though.
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Old 02-01-2013, 05:03 PM   #8 (permalink)
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Will do, thanks!
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Old 02-01-2013, 09:16 PM   #9 (permalink)
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I cant tell you hoe many times I had a CEL come on when I get gas cause the guy pumping it didn't put the cap on right........ or at all. Yea we dont pump our own gas in NJ but I would MUCH rather do it myself!
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Old 02-07-2013, 08:30 AM   #10 (permalink)
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The code went away, but came back along with po457! Is po457 connected to the other one, fuel cap related? This is crazy, probably just buy new gas cap? or is it more canister related? Need some help
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