WTB - Diagnostic cap with tether for '88 M5 E28

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gsidman
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Joined: Mar 26, 2021 2:51 PM
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WTB - Diagnostic cap with tether for '88 M5 E28

Post by gsidman »

The parts houses keep sending me the wrong part. They are all too big, obviously from later cars. Does anyone have a spare in good condition, or the proper part number for the '88 M5 ??
Shawn D.
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Beamter
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Re: WTB - Diagnostic cap with tether for '88 M5 E28

Post by Shawn D. »

Are you going by what they supply on site, or have you looked up the number in the ETK (i.e. at RealOEM.com)?
DFWTX85
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Re: WTB - Diagnostic cap with tether for '88 M5 E28

Post by DFWTX85 »

Do the other E28's not use the same cap? If they all use the same one then I saw these new on eBay last week.
gsidman
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Joined: Mar 26, 2021 2:51 PM
Location: California

Re: WTB - Diagnostic cap with tether for '88 M5 E28

Post by gsidman »

I have been going by the fit list on the suppliers sites as I can't find a part number on realOEM.com. Maybe I am not looking at the right sub-section, but I have been all over realOEM.com with no luck. Apparently, there are more than one part numbers, but they all lead to the wrong part. I am sure there are folks out there better at finding a part number. Any help would be appreciated.
DFWTX85
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Re: WTB - Diagnostic cap with tether for '88 M5 E28

Post by DFWTX85 »

gsidman wrote: Jun 11, 2021 11:44 AM I have been going by the fit list on the suppliers sites as I can't find a part number on realOEM.com. Maybe I am not looking at the right sub-section, but I have been all over realOEM.com with no luck. Apparently, there are more than one part numbers, but they all lead to the wrong part. I am sure there are folks out there better at finding a part number. Any help would be appreciated.
Try this and see how it compares to what you've already seen....

https://www.ebay.com/itm/293887072260?

https://www.ebay.com/itm/273259503060?
gsidman
Posts: 15
Joined: Mar 26, 2021 2:51 PM
Location: California

Re: WTB - Diagnostic cap with tether for '88 M5 E28

Post by gsidman »

Thanks for the links. Both won't fit. All the eBay caps I have seen so far are for later model cars or not right for the '88 M5. The mystery continues....
John in VA
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Re: WTB - Diagnostic cap with tether for '88 M5 E28

Post by John in VA »

It's odd that they don't fit, unless as usual BMW has recommissioned the part & the vendors did something wrong! The E12, 21, 23, 24, 28 & 30 all used that cap. BMW part # was 12521273101; now 12521286052.
RonW
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Re: WTB - Diagnostic cap with tether for '88 M5 E28

Post by RonW »

A wild guess: In the rest of the world, the '88 5-series was the E34, which used a screw-on cap. If you ask for a cap for an '88 5-series, they might send you that. Ask for a cap for an '87 instead.
gsidman
Posts: 15
Joined: Mar 26, 2021 2:51 PM
Location: California

Re: WTB - Diagnostic cap with tether for '88 M5 E28

Post by gsidman »

Thanks for the replies. However, part numbers 12521273101; now 12521286052 refer to the cam sensor cover, not the engine room diagnostic port cap. The '88 M5 is an E28, and obviously the diagnostic port is different from the other series 5 cars of the era. All series 5 M5 are designated as 1988 cars, regardless of when they were manufactured. All the caps I see on eBay are incorrect. I have one in hand and it clearly is too big, the tether is too large, it has a large center plastic prong and the wrong pin configuration. Searches on ECS, Turner and other sites all try to sell me the wrong cap. The mystery continues.......
kojo96
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Location: Pleasanton CA

Re: WTB - Diagnostic cap with tether for '88 M5 E28

Post by kojo96 »

Maybe post an image of your diagnostic port so we can see what it looks like, may help you get results.
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