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Old 07-09-2003, 02:54 PM
Posts: n/a
Thumbs down Engine Wiring Harness

Current owner of 95 E320 wagon with 90,000 miles. The engine light just came on and I have just learned of the issue with the inuslation rotting/wiring issues. Have done research on this and other sites.

My question is how have other people handled this? Do you pay the repair or fight with the dealer/MB USA or the area rep? I am in the ATL Ga area any ideas on the best dealer or shop to work withor the proper people to call or write for some regular mechanic will not touch this with a 10" pole.

I have owned a few MB's as well as many other high and low end cars and have never run into an issue so cleary tied to defective design.

Information, ideas, asistance

is greatly appreciated.



Funny thing is I just attended this high dollar new car roll out by Mercedes (which cost some big bucks to put on) and was feeling good about getting another MB and then this. I would suggest MB take some $$$ and fix this issue instead of spending it on promo. If you screw your current owners it is very hard to overcome with flashy adds and flashy roll outs.
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Old 07-09-2003, 03:58 PM
Posts: n/a
The check engine light is mostly emmisions I think. Do a search on retrieving the codes. Much expertise on this site on this subject.

The wiring harness on your car at 90,000 miles might be done for free if you yell loud enough(contact a regional service supervisor). Just had mine done at 197,000, had to pay though, about $800.
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Old 07-09-2003, 04:53 PM
Posts: n/a

Any ideas of how to get ahold of the regional supervisor?

One of my local MB dealers said they did not have this persons PH# and referred me to a 800 MB number. People at 800 said I needed to contact my local MB dealer. When I told the person on the phone I had 90,000 miles on my car she said WOW THAT's ALOT of mile what do you expect? I had to work to stay calm.
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Old 07-09-2003, 10:07 PM
haasman's Avatar
Registered User
Join Date: Jun 2001
Location: San Francisco, CA
Posts: 3,096
Try these:

This is Mercedes' problem. Forget about out of warranty. The presumption is that they build quality, safe cars.

The district manager has lattitude to ensure customer satisfaction in their reliable, high quality and safe automobiles.

Mercedes-Benz of North America
Client Assistance Center-



Mercedes-Benz USA
Client Assistance Center
P.O. Box 607
Paramus, NJ 07653

I am sure they would like to know how concerned you really are.

Keep us posted,

'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)
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Old 07-14-2003, 11:20 AM
Posts: n/a
Found a MB dealer that would not make me wait two weeks to bring it in.

Just off the phone with the service advisor and the fault codes point too an Air Injection Check Valve and Air Shut Off valve.

The P&L is $450.00.

Two questions:

1.) mY CAR (95 E320 W) HAS 90K and to my knowledge has not had the wire harness it likely that the diagnosed probelm/fix above is the total problem or is a symtom of a larger problem that will lead to may future trips to the shop?

2.) Is 400-450.00 a reasonable price for P&L for the replacement of the two valves?

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Old 07-14-2003, 01:28 PM
I told you so!
Join Date: Jun 2002
Location: Motor City, MI
Posts: 2,741
All you got was a phone diagnosis. You gave them the Codes and they told you what the Codes meant. The Codes mean something is wrong with that subsystem of your vehicle. It may be the actual sensor, the wiring, or something else that can affect that subsystem. There still is a very good chance the wiring may be at fault.

When you take your car to a dealer one of two things may happen. The mechanic may keep substituting parts until he finds the offending part, since he has the luxury of restocking the parts, then charge you only for the bad part. Or, he may keep substituting parts until the problem goes away, then charge you for all the parts related to the problem. He may charge you for the two parts PLUS the wiring harness.

Since the wiring harness is a very likely problem for your car, I would be inclined to replace the wiring harness first. There's no guarantee it'll fix your present problem, but it just may. Even if it doesn't fix your problem, replacement will likely prevent future problems, so the money wouldn't be wasted.

Insist on having the original engine wiring replaced.

I cringe at the thought of how the new models will hold up with time. Did they give the marketing aim for the new product roll out?... such as how long they expect the owners to keep their new cars?

When you get your baby fixed, hang on to it. Once fixed it'll be one nice ride.
95 E320 Cabriolet, 131K
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Old 07-14-2003, 01:35 PM
Posts: n/a

let me r give you more info...

The diagnosis I gave was after my car was hooked up to the MB diagnostic machine.

I was told by MB that the codes came back clear (for two valves mentioned earlier). They said when the issue is the wiring harness the error codes or information they get back from the diagnostic machine is much less clear???

I do not know if i should be happy it's not the wire harness or be very scared because I am at the bigging of a journey that will cost $$$ and ultimately lead to them telling me that if fact i do need to replace wiring harness?

I asked for the error codes to be listed. I guess I can check them against info from the forum?

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Old 07-14-2003, 01:53 PM
Registered User
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,768
A very commnon AIR code on that chassis is simply the plastic vac hose running in front of the engine , over to the AIR valve ,becomes brittle from heat fatique and breaks..
Simple to see and simple to fix [ I replace with rubber hose]

you have code access on that car with a led/sw under the hood ,,, see archieves
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Old 10-04-2003, 07:12 PM
Boudreaux's Avatar
Mein Name ist Dieter.
Join Date: Sep 2003
Location: Pearland, TX
Posts: 174
Wire harness replacement.


Just replaced the wire harness on Dieter. Took about 3 hours but well worth it (local MB shop was going to charge $950 p & l plus tax). If your wires look like this near the injectors, then more than likely they will look like the following photo. While I was at it, I replaced various vacuum hoses. This fixed a lot of problems with the CEL and idling. Good Luck.

'94 SL500 Tourmaline Green, 120K miles as of February 27, 2005.

Updated photo September 2004
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