W204 C220 CDI (2012) - P010106 - MAF algorithm fault - suspected air leak from inlet manifold

[LG99]

Hoping someone has experienced similar issue before, car is in limp mode with no boost and after scanning has the above MAF code. first did an visual inspection of the pipes like the intercooler passenger side but looks ok and no oily residue as it seems like a common issue. bought a smoke machine and tested after the MAF, and smoke came out behind the fuel filter, I'm thinking that there is a crack in the inlet manifold. also there is oily residue sitting beneath the fuel lines around the fuel filter close to where the inlet manifold sits. I've uploaded the videos below to google drive.

videos of smoke test

as a side note, as the car is in limp mode it will not regen on its own and it became partially blocked, but I cleared this with a standing regen using my OBD scanner, the MAF fault was still active so I assume that the underlying issue of the air leak is causing the DPF to be blocked as it will not regen while in limp mode. Until we fix the air leak, I don't want to throw parts at the sensors.

 

[Uncle Benz]

A while back, but been here before once or twice…

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forums.mercedesclub.org.uk

 

[alexanderfoti]

As above, likely a broken intake manifold bolt etc.

You are correct, it will regen lots, then block regens as it realises there is a fault. Its important to ensure it doesn't get blocked.