My Neon, 49k miles, recently has activated the check engine light.
Advance Auto read the OBDII and got a code “PO456 EVAP Emission
Control System Leak Very Small” - I believe that is the correct code,
I transcribed it into my maintanence log and no longer have the
original printout. I know the description is correct although
something tells me I might have transposed a number. Anyhow...
I checked the gas cap and later replaced it. I checked all the hoses
I could find under the hood. The large hose from the throttle body to
intake manifold was loose (left that way by the dealer a couple years
back when the rebuilt the transmission I believe) so I tightened it.
Air cleaner is new and properly seated in place. I found no loose or
cracked hoses as far as I could see. If I clear the light by lifing
the battery lead it will stay off for about 2 weeks and then come back
on with the same code.
The local dealer has provided most unsatisfactory service on the
numerous times the car was in for warranty work so I would rather not
return it to them. I would appreciate any advice as to other things I
might check. My other, and probably better, alternative is to trade
the thing in on a Toyota.