The intake air temperature sensor measures the temperature of the air as it is supplied to the cylinders and transmits the value to the ECM. If that sensor fails, the ECM will probably put your Sprinter into limp home mode. Changing the sensor is quick and easy.
Probably the maintenance item you’ll need to do most as a Sprinter owner (besides a car wash) is to change the engine oil. Mercedes recommends oil changes every 10.000 miles. It’s an easy task and if you want to save a bit of money you can do it yourself. If you ever used a wrench this is a simple two on the difficulty scale.
To remind you to bring your Van to the friendly Mercedes dealer and spend some money on having them do the required maintenance or change the oil, the engineers at Mercedes added ASSYST. A fancy name for a countdown clock that counts miles and days and lets you know when you’re due for the next service. This post is about resetting this clock once you’re done the maintenance items yourself. An absolute easy 1 on the difficulty scale.