Turbo: It forces air into the engine so that the combustion can take place. It is very common in cars with Diesel engines.
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The turbocharger works like a small and powerful fan since its blades move very fast. It takes the natural air, compresses it and forces it inside of the cylinders. When it gets damaged, it may produce a very loud noise, similar to a screech, because the axle brushes against the bodywork. White or black smoke may also come out from the exhaust pipe.
The car went into limp mode on inspection of the odb reader, it showed 4 codes: P0219 & P0299 (2 live and 2 archived), this also threw up the ASC & 4x4 Requires Servicing. I cleared the codes, as the guy we bought it off didn't clear the codes after a turbo change...since clearing P0106 and P0107 have popped up, cleared them then limp mode again with P0106 & P0299...took off the Map & Maf censors cleaned reinstalled...odb computer is picking up wattage and live data from Map, Maf & Turbo but none from the EGR valve, whats the best things to check before removing the EGR valve (fuses etc) any help is much appreciated
MAP & MAF sensors were all checked and working, including EGR Valve and Throttle body it ended up being a blocked vacuum pipe and a tiny split in the same pipe towards the jubilee clip - garage recommended to book in for a manifold clean or replacement