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I changed mine years ago after it started to become erratic and then it just completely failed. I thought it might have been the Teflon in the Slick 50 I added. It was an easy job (less than an hour), and the part was not that expensive. Like macdrone said, be careful of the lower wiring harness. One of the leads from the harness goes to this pressure sender.
The sender unit (#71 in the picture) part number is A 006 542 9417.
There is an O-ring too (#77 in the picture) that you might need to get if it doesn't come with the sender. Part number N 007603012113
BTW, the power steering leak is common on this car. You can get a kit at the dealer and reseal it in about an hour. There are a few posts on resealing the radial shaft seal and you can do it without removing the entire pump (a major operation). You will need to look at the tag on the top of the p/s pump and get the numbers. There are two different kinds of pumps on this car--a Vickers and ZF. The seal kits are different. The kit is only about $25.
Good luck.
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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles
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