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I've been getting EVAP DTC P0440, 41 and 46 intermittently over the past year and generally have been able to make eliminate them by fumbling around with the charcoal canister and hoses and clearing the codes. Now I am getting the same codes accompanied by a high frequency tapping from the air inlet port on the charcoal canister once the car has been driven for about 15 min. You can hear the sound inside the car - it's a whirring sound and I traced it to the air inlet port with a stethoscope. I'm hesitant to replace the cansister because of cost and because I suspect the problem might be a VSV. Any ideas on troubleshooting this? Thanks.

PS This is my first posting but I've been impressed by the strings I've read.
 
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