The control unit for the engine (ECM) measures the engine oil level by using an oil level sensor. The level sensor is in the oil sump, which means that the correct level can be read only when the oil has drained into the sump. To read the correct level, the engine must have been running so that the oil filter is filled with oil. Use the function "Oil level check" to ensure that it is the right level! Proceed with this function to enter the correct value to the control unit.