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Old 09-19-2003, 05:25 PM
nuclearman's Avatar
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Join Date: Sep 2003
Location: ontario
Posts: 19
Unhappy oil pressure switch replacement on M119

well everyone i have bought my shiny prevoiusly enjoyed 92 400E. Goes like a jet on the highway...almost too fast...anyways.
I'm drivin from my home and the oil gauge starts on a downward trend to 0 off. I panic pull over and begin to assess the situation with the motor turned off. get out check oil level, Fine. Then turn motor over and strange noises...OK. decide to drive back less then 400 meters. Park and check no clacking and oil is splashing at the top of the oil filler port. OK...must be the damn switch hard to idiot lights. Anybody..??

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Old 09-20-2003, 07:23 AM
KenP's Avatar
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Join Date: Dec 2002
Location: Southern New Hampshire
Posts: 418
First, I'd recommend you get a new sensor and replace it before you drive the car any more.... either that, or put a mechanical pressure gauge on the engine and see what's going on. Its unlikely that your oil pressure would just die like that, but I'd sure want to make sure you have oil pressure before running. The alternative is pretty ugly.
Assuming its the sending unit (sensor), its easy to change... at least it was on my M119 (S500, 1996). Located right at the bottom of the oil filter housing; you can easily reach it from under the car. One wire to detach, then just unscrew it and replace.
When mine failed, it was the opposite of yours... oil pressure stayed at 3 bar all the time the engine was running.
The sender was about 60 bucks and I'm sure Phil right here at the Parts Shop could get you one pronto.
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Old 09-20-2003, 08:09 AM
nuclearman's Avatar
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Join Date: Sep 2003
Location: ontario
Posts: 19
Thumbs up

thank you...
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