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Old 06-06-2001, 11:51 AM
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Join Date: Nov 2000
Posts: 107
Recently, my oil pressure gauge started behaving erratically, sometimes working, but most of the time dead. While in the shop for something unrelated, the mechanic thought that it needed a new sending unit. I don't know anything about the sending unit, where it is located, etc., but just wonder if it is something I can do myself. Also, is his diagnosis correct? Thanks in advance for any helpful replies.
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Old 06-06-2001, 01:04 PM
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'94 S500: only 793 sold!
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,924
Probably not . . . .

Recently had a similar problem on my S500. It indicated ok, but it leaked oil. The sender unit is located on the right of the engine just above the pan.

For my car, had to jack up the engine so you can remove all of the screws (15 or so) on the pan. First, of course, you must drain your the oil. So this job is most naturally done when you need an oil change.

After that, it basically installation of a new sender unit. In my case, the two 'O' rings the seal it were leaking, so they were replaced. This is a fairly expensive job (in my case) just to change two 0.05 cent O-rings.

Make sure that it's just not a bad connection that's causing the erratic indication. You may be able to do that yourself if you can get under the car.
Regards . . . . JimF
'94 S500 Cpe

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