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#1
01-10-2015, 03:00 PM
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Embarassed to ask...
I just picked up a 1995 E420SE (W124) and I can't find the diagnostic connector. I've searched and I think it's supposed to be on the passenger side of the engine compartment but I don't see it. Does it have a cover or something on it that is not obvious to me.
I know it's a dumb question. Sorry it's my first W124. 
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#4
01-10-2015, 06:21 PM
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I am a fool for w124s. Could I trouble you to post pictures of your latest gem?
__________________
dtf 1994 E320 Wagon (Died @ 308,669 miles) 1995 E300 Diesel (228,000) 1999 E300 Turbodiesel ( died @ 255,000) 2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop 2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army BMW 330 xi 6 speed manual (175,034 miles) 2014 E350 4Matic Wagon 128,000 miles 2018 Dodge Ram 21,000 miles
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#8
01-10-2015, 11:11 PM
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There's no such thing as an E420SE.. It's an E420.
No Mercedes had OBD2 capability until 1997. There is a diagnostic port near the battery. You will need to build the diagnostic tool (research w124 diagnostic tool build) and there's a lot of threads on there. Your rough running issues could be a number of thing. I need you to answer a question for me. Has the wiring harnesses ever been replaced (upper and lower harness). If you don't have any prior knowledge of this being replaced, I suggest you check the date on the harnesses. Anything pre 1998 harnesses are biodegradable harnesses which cause running issues.
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#9
01-10-2015, 11:43 PM
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The wiring harness tag where the battery would be is dated 1994.
I did some pretty aggressive poking on the injector wires and the harness is bad. What would be the part numbers for the upper and lower harness? Might as well do both while I'm there. Last edited by thorsen; 01-11-2015 at 12:05 AM.
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#10
01-11-2015, 01:35 AM
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This kind of a little bit resembles the diagnostic port..maybe. Does the cover come off?
I know little of the 94+ 124s 
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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#11
01-11-2015, 09:03 AM
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Jake, I believe any car registered in the us from 96 up has to have the OBD2 connection. It is required for inspections. I don't know about Mercedes, but some cars had it in 1995.
PaulM
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84 500 SEL (307,xxx miles)
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#12
01-11-2015, 03:55 PM
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CAN I HAVE THAT DRIVER SEAT?
Just kidding....
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Mostly, I don't know notin, I just know where to look. I am looking back, to over 30 years in Electronics Design. Electrons don't care if they move in a car, computer or relay! 95 W124 E320 M104.992 - Because, I love to repair, naaaah! Over 221,000 Miles Cheers, Norbert
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#14
01-14-2015, 11:05 PM
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that round connector on the box where it says battery in trunk is where the diagnostic connector is. You won't be able to read it with any scan tool, you're gonna need the SDS to hook that up. This is a 124.034
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#15
01-16-2015, 09:55 AM
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That is a beauty - thanks for posting the picutres. MB really stuffed that engine into that engine bay, non?
__________________
dtf 1994 E320 Wagon (Died @ 308,669 miles) 1995 E300 Diesel (228,000) 1999 E300 Turbodiesel ( died @ 255,000) 2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop 2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army BMW 330 xi 6 speed manual (175,034 miles) 2014 E350 4Matic Wagon 128,000 miles 2018 Dodge Ram 21,000 miles
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