Sudden power loss – indication for injection system on

Hello all, I had a strong “PS loss” yesterday after the lamp for the injection system (1.3 Multijet Grande Punto) started. Since I had already had to do the 30,000 inspection already already, I brought the car to the FIAT dealer today. Conclusion: allegedly the air mass meter and the contact sensor is broken or “totally rust”, they changed both immediately (without asking me) and besides the material costs almost 200 EUR (!) labor costs and alone calculated for reading the fault memory 50 EUR and booked the rest for the exchange of the two parts and test drives. Apart from being pissed off that something was repaired here on my own without calling me before: can a defective LMM really lead to the fact that I hardly get up the mountain with the 2nd gear and my car has blown out white-blue smoke while (cold) starting for some time? Would you like to hear your opinion.