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.
Safety functions
An automatic engine start is prevented in the following conditions:
- Repair work in the engine compartment (engine compartment lid open)
Exception: Service position of the engine compartment lid contact switch!
- Leaving the vehicle (driver's door open and driver's seat belt not fastened).
Attention!
Engine start at service position of the engine compartment lid contact switch
Depending on the series and version: An automatic engine start is possible when the engine compartment lid contact switch is in the service position. Therefore, deactivate the automatic engine start-stop function (automatic engine start-stop function button).
Be sure to comply with safety precautions during repair work on vehicles with automatic engine start-stop!
Always prevent an automatic engine start during repair work in the engine compartment by deactivating the automatic engine start-stop function (automatic engine start-stop function button).
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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.