The oil level float switch does fail occasionally. I've replaced a couple of them. They are about $40 and you have to drain the oil pan so do the job during an oil change. The float switch is on the left side of the oil pan and is secured by two screws. Make sure you replace the o-ring seal also.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970