Compress Ignite,

Thanks for your reply and the clear diagrams. Where do you get those from?

Let me clarify: The Coolant Level Light works fine after replacing its sender. When the tank was empty it was lit, when I filled it the light went out. The Oil Level Light is on regardless of the coolant level.

Where do I look for the wire of the Oil Level Sender?

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2004 E500 4Matic 138,000 miles