Oil pressure sensor...has a rubber o ring on it. it like to leak bad when it deteriorates. Get a new o ring from the dealer if you cant find it online. the sender is likely just fine. Replace the o ring whenyou change the oil. Easy job, two bolts and it is off, replace o ring and reinstall.
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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red
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