Car was running ok this morning, then it felt that there was no 'surge' as if the Turbo wasn't kicking in. Continued on my journey for 8 miles (mainly flat, so no big issue) but as soon as I got to a hill, the car was in limp mode - no power at all to climb the hill (car really struggling) Anyway, I switched the engine off as soon as I got on the flat, started up and then things were like back to normal again - the turbo was working ok! I did a quick search on the forum, and the MAF Sensor/N75 seems to be the main cause (though I will try to get it on VAGCOM). Q's? Where is the MAF and n75 sensors located and can I replace these myself? What will be cost? How do you best clean the turbo with Mr Muscle? Thanks in advance.