HI i been throwing this evap code for more than a month now i keep resetting it with my reader but comes back.
What i did is changed gas cap to proper type and had mechanic do complete smoke test and found nothing wrong apperently, but i wonder if my o2 sensors would throw this code is iether one was not working.

 

Hi, did you got this issue resolved?

 

no the code still remains, though i changed the gas cap.. i think i need to change both o2 sensors one day.

 

Look at this link. It might help you.

OBD-II Trouble Code: P0440 Evaporative Emission Control System Malfunction

 

oldchevy Thank you for a great link. I have found few others, but this seems to explain stuff even more. I guess without having a garage handy will be hard to fix/find a problem.

Will have to drive with check engine light on then...

 

thanks alot sir !

 

Few interesting links here:
DTC P0440
P0440 Diagnostic Test Code (DTC) Details - 2001 Chevy Venture