I have 2014 S60 T5 AWD with 54000 km. When I was driving on the highway the car began to twitch and later the traction had finally lost. Only one problem code was - system too lean. I hardly came to the volvo service. Mechanics at the service replaced fuel pump, fuel filter, spark plugs, fuel pressure sensor and fuel controller. The car started again, but still twitches sometimes and it has no problem code. When it twitches, fuel pressure jumps up 1.8 kg to 4.5 kg