1. Open the hood of your Renault Scenic.
2. Locate the engine cover, which is usually made of black plastic.
3. Remove the engine cover by unscrewing the bolts or plastic clips that hold it in place.
4. Once the engine cover is removed, you should have clear view of the engine block and its components.
5. The TDC sensor is typically located on the side of the engine block, near the top.
6. The sensor will have a wiring connector attached to it, which helps you to identify it more easily.
7. The exact location of the TDC sensor may vary slightly depending on the specific Renault Scenic model and year, so you may need to consult your vehicle's service manual or documentation for precise instructions.