Hi . Just a quick one . Before forking out on getting vcds reading I thought I'd try you lovely people . 2.0tdi 170 has destroyed 2 egr valves. And throws p0406 sensor a too high . When maf is unplugged it runs fine without p0406. When maf is plugged (also tried a new maf) the revs become eratic and throws p2108 throttle body.. also loud clicking coming from egr throttle body area when car is turned off after drive. Any pointers would be much appreciated as It's just failed it's test because of eml being on . Sozz if this has been covered before .. ps the previous owner for some ridiculous reason put an induction kit on it .. so no original air box.. any pointers appreciated. Thanks