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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 10-16-2009, 12:36 PM
lexrace24 lexrace24 is offline
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Exclamation P0446 Evap Circuit Malfunction

I’m having trouble diagnosing a SES code p0446, which is telling me there an evap emission control vent circuit malfunction. With 222,000 miles on the car the first part I change was the gas cap, thinking this may be the cause but the SES light is still on and the code still appears. Is there any schematic I can use to read the wire or troubleshoot this problem?
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  #2  
Old 10-16-2009, 01:07 PM
smolck's Avatar
smolck smolck is offline
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Replace your gas cap. Code will go away.
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  #3  
Old 10-22-2009, 12:53 PM
lexrace24 lexrace24 is offline
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Exclamation P0446 Evap Circuit Malfunction

I replaced the gas cap and the p0446 went away, but now i have three different codes
P0171 Bank 1 is lean
P0174 Back 4 is lean
P0456 EVAP Leak Monitor Small Leak Detected

I have also noticed there is a high pitch whistling sound when the car is under hard throttling. I do a K&N cone air filter, I will check the wye fitting going to the throttle body for any crack’s. Is there any other possible suggestion that can assist me in troubleshooting?
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Old 10-22-2009, 01:30 PM
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smolck smolck is offline
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Originally Posted by lexrace24 View Post
Is there any other possible suggestion that can assist me in troubleshooting?
I think you have it nailed. When I had a cone filter and CAI kit mine whistled even with no cracks. Most likely the little neck that runs to the ICV is cracked.
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now, go burn your Man Card, and buy yourself a Camry....
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