Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Oil Monitoring
General
The following components are used for oil monitoring:
- oil level-/oil temperature sensor (7/166)
- Engine Control Module (ECM) (4/46)
- Driver Information Module (DIM) (5/1).
The sensor informs the driver via the Driver Information Module (DIM) that the oil needs to be topped up.
Detecting the oil level
The integrated electronics of the sensor calculates the oil level using the measured value for the oil temperature.
For the correct oil level to be calculated, temporary oil level changes in the oil trough must also be included in the calculation, which can occur when driving on hills, around bends or similar for example. The Engine Control Module (ECM) makes these calculations using the oil level sensor signal and a number of other parameters, for example, vehicle speed signal and load signal.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.