So p1174 was fixed with the filter replacement (it's good to know that it has to do with either MAF or a clogged filter and not O2 sensors like p0174) I have run the diagnostic twice when I got the SES light again to make sure.

I replaced the CVS (vent valve) with a working used one from Paul Grant, but the p0446 came back, maybe his CVS is no good. I'm going to replace it again and send it back to Paul. I am wondering what else can give you a p0446. Some have had specific codes and they have replaced the part, to no fix, then they have either replaced a Gas Cap or Purge valve and the code went away, but p0446 is supposed to be a CVS. I think maybe the outlet that you connect the CVS unit harness into could be bad. Any suggestions Mike?
Thanks, Dave

 

the 446 is an electrical issue with the CVS, not necessarily the vent itself.

 

Thanks I'll have the electrical checked &
David