During my last inspection in October, Volvo found that there was a hair crack in the fresh air hose / air intake hose of my Volvo C30. Since I had no problems with the vehicle so far, I did not have an exchange (the hose alone should cost 276.26 euros). The service staff also told me that I could go on without further trouble and that the BC would report at some point if an exchange was really necessary. Today (-5) I then had the phenomenon that during the acceleration (city traffic approx. 40 km/h) the BC reported with the message “decreased engine power”. After I had stopped briefly and switched off and switched off the ignition, the error message went away and I was able to continue normally. By Google I then came across an engine talk thread, where someone complains about a reduced engine power, but in which no corresponding error message in the display gets Here it was commented, among other things, that it could be the air mass meter (which is in / on the said hose) because there is no error message in the BC in case of such a defect. Therefore, I am somewhat unsure whether my problem is really due to the hair crack detected by Volvo. What do you think? Of course, I could just have the tube replaced for good luck now. Then there would be my second question … Without air mass meter there would be the smart c in the accessories for 99 Euro (Skandix), with air mass meter this is about 200 Euro (Wikinger Parts). Would also the favorable variant be enough here or should one exchange the LMM immediately? Vehicle: Volvo C30 Drive BJ 06/2010 (Facelift) about 102,000 km part number hose: 31293729 I would like to thank you already in advance for your answers