Quote:
Originally Posted by Helihover
You will rarely if ever throw a code from a bad gas cap.
P0445 sounds like a purge valve. Locate the valve, it's on the front of the engine on the driver side. Then start the car cold and you should here that valve clicking very fast. It will almost sound like a valve tick. You can also take out the valve and cycle it with 12 volts to hear it operate. I did this once and may have jarred something loose or something. Anyway it didn't last. I replaced the purge valve with a new unit on my 01' 4.4 and the p04445 went away.
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Agreed its more likely the purge valve or vacuum leak up front. I had this code early on and it was a vacuum hose up front near the purge valve thus creating a malfunction. Always start with the simple things before going deep.