Q: After replacing the air filter, fuel filter, oil filter, transmission oil, differential oil, transfer case oil, and brake oil of the 2014 Mercedes-Benz GL350 3.0 diesel car, the speed can only reach 150km/h. What is the reason?
A: It is mainly because a small amount of air is mixed into the diesel oil circuit during maintenance. It can be restored to normal after the air is carefully exhausted. Of course, it is not ruled out that the control system and sensor signals are disconnected or short-circuited during maintenance, which can be eliminated by diagnostic computer detection.