Codes; PO 441, PO 442, PO 446 - Toyota Tacoma Forum
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#1 (permalink) Old 04-18-2009, 08:06 AM
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Codes; PO 441, PO 442, PO 446

My check engine light came on yesterday and my scanner gave me these codes. 441 is EVAP Emissions Control Systems Purge Flow Fault, 442 is EVAP Emissions Control System Leak, and 446 is EVAP Emissions Control System Vent Circuit Malf.

Any ideas what this is all about? Thanks for the help.
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#2 (permalink) Old 04-18-2009, 08:17 AM
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Re: Codes; PO 441, PO 442, PO 446

check your fuel tank cap (gas cap). is it all crudded-up? is it tightened properly? another question: do you stop fueling when the nozzle stops? or do you pump it after the stop and try to round-up to the next dollar?

you should always stop when the nozzle stops. maybe you could try to pump once after the stop, but continually pumping to the next dollar figure adversely affects the charcoal canister. a leaky/crudded-up gas cap could cause problems also.
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#3 (permalink) Old 04-18-2009, 08:30 AM
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Re: Codes; PO 441, PO 442, PO 446

Yeah, I always try and put a little extra gas in to round it off. I won't do that anymore. I have taken the gas cap off and re-tightened it and pulled off the negative wire at the battery terminal. Maybe that will cure it. How much is a new charcoal canister?
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#4 (permalink) Old 04-19-2009, 12:23 AM
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Re: Codes; PO 441, PO 442, PO 446

don't know OTOMH
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#5 (permalink) Old 04-19-2009, 12:33 AM
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Re: Codes; PO 441, PO 442, PO 446

never top off..

get a new gas cap, disconnect the battery for a few minutes and give that a try..
I had that same setup.. always shoot for at least 3 clicks on the gas cap when tightening..

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#6 (permalink) Old 04-19-2009, 12:56 AM
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Re: Codes; PO 441, PO 442, PO 446

yep..i had those codes but replaced the gas cap and they went away..a locking gas cap.
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