Hi all , got this one in today that has been worked on by another garage .Customer has had upstream lamda fitted by previous garage (don't know previous fault code but assume same.
Found fault code p0170 displayed, Carried out basic checks, smoke tested ok(exh & inlet) so ruled out no external leaks .
Checked gas readings and all well within specs , forgot to bring printout home but as far as i can remember o2 .2 , co2 15.4 , hc 20 , co 0.00

On live data noticed long term fuel trim 20% so was thinking towards the line of ccv valve sticking open intermittently .Checked hose to ccv will req changing as its getting on the soft side although not collapsed

I looked on previous posts and ccv valve was mentioned for fuel trim errors and also maf sensor .Couldn't get laptop on to scope maf today .
So question is: am i on the right direction thinking ccv valve sticking causing fuel trim errors or potential maf sensor fault ? what would be an ideal voltage/ scope trace for maf on this model ?.
Add: lamda sensor looks like a ying tong , ecp sourced apparently

Regards to all
John