Hi guys am trying to solve an Intermittent power loss problem, The car is a C220 CDI (w203) the codes that I have are P1403 & P1470 Mil lamp is off, The second code is Turbo pressure to high / to low which I am assuming is being thrown because of the first code MAF / EGR sensor circuit issue, So far I have checked the MAF all Ok, the vacuum lines that I can see in the engine bay,, although I cant see how far they go back,, Stiil need to check the EGR for operation, will do this but need to get hold of a hand vacuum pump,, The car runs fine even when this issue is pressent it just has no pull. Please Please does anyone have any ideas,, please bear in mind this car has covered nearly 200,000 miles.Any help would be much appreciated from a head scratching auto electrician

 

Ok guys have checked out the EGR there was loads of crap inside ,, have cleaned out and EGR is functioning ,, but the problem still exists and the odd thing is that this problem only seems to be happening when the engine is under load.

Really need some help with this one.
Paul