Bit desperate now, main dealer seems to be just swapping stuff with no clue really what the problem is. Engine light came on but nothing else untoward, first they changed a sensor and then said the filter needed cleaning, now they're saying filter needs replacing but having read a bit I would have thought engine should be in limp mode if that was the case but it seems okay. Really don't know what to think now as I'm looking at 2k+ outlay.

I'd like a second opinion and wondered if there were recommendations? I'm in Accrington so VASS is nearby and Reedley Service Centre near Burnley is another option VW, Audi, SEAT, Skoda Service, Diagnostics, Car Repairs & MOT Garage ?

Audi A4 3.0L quattro.

Many thanks