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Replacing the Automatic Gearbox Connector O-ring

Model: Mercedes Classe M W163 - Years 1997-2005
Part: Transmission

If you notice an oil leak at the connector on the automatic gearbox, it is likely that the O-ring seal is damaged. To replace it, first remove the connector and drain the oil from the gearbox. Start by unscrewing the screws around the edge of the sump, ensuring to place a container underneath to collect the oil. Once the sump is removed, also take out the filter and proceed to the connector: release the securing clip represented by the white plastic ring, extract the connector, and unscrew the fixing pin of the connector before proceeding with the extraction and replacement of the O-ring.

Updated on 18 February 2026 by ScegliAuto

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On the Peugeot 407, the boot may become stuck, possibly due to a problem with the control button or the lock actuator. In such cases, you can perform an emergency opening by following the simple procedure shown in this tutorial. First, open the rear doors, then lower the seat back by operating the release lever. Next, go inside the boot, locate the lock, and manually operate it using a flathead screwdriver. The boot will then be free to open.

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