Hi

Looking for some help on this one, I have this van in with extreme loss of power, has no boost whatsoever.

I have checked for pipework leaks etc and have now come to a dead end.

After scanning For the codes I came up with the following definitions;

P0299 ; Turbo pressure electrovalve control - turbo too low compared with setting

and;

P0402 ; EGR regulation - air flow less than setting (150mg/stroke difference)

What I am asking is how do these work and how to test?

I have tested the supply voltage to both and that is good with KOEO.

I'm fed up of reading codes and guessing the parts, so would really appreciate some info on how to test with a multimeter etc.

I have access to AD, but no test info for these items are present.

Good old Autohasnodata.

Thanks in advance

Liam.