Diesel exhaust fumes

[Hoody]

My Fiesta 1.4 TDCi is 05 with 39k on the clock. It started to smell of diesel fumes inside so I took it for a service at 38k to a main dealer. There was an improvement afterwards, but the smell persisted.

I have had it back in the garage but they were unable to find anything wrong, but resealed the pollen filter. Has ayone else had a problem like this

[mintalkin]

check for splits in any rubber hoses in the engine compartment which could leak the fumes through the vent system