EML on due to break in wiring

[Neil C1]

my EML light is on and the fault codes on my basic OBD2reader are maf fault (p0102 mass or volume air flow a circuit low)Turbo fault (p0243 turbocharger westgate solenoid A) and egr fault (P0403 exhaust gas recirculation control circuit). With a P0661 thrown in for a laugh. Took it to the MB Indy to go on star machine. Came back with wiring fault.
1, Is there a simple way of checking the wiring
2, would 1 wire in the loom cause all the above issues or will it be several
3, would it be easier to buy a used loom from eBay
Thanks for any help
Neil

 

[Uncle Benz]

Could you tell us the car and engine type fitted please?

 

[John Laidlaw]

Assuming it’s still the profile W203 C270 2004 ?

 

[Neil C1]

Got it in one John
Yes Mercedes c270 w203 2004