I have a 1995 S320, W140, Having a CEL, was able to get code via AutoZone.
Code posted P0400 which indicates a EGR valve problem. I need a little help finding the darn thing. I'm a little afraid of digging to much without a little information. I've tried searching the forum without to much luck. Again any info. would be greatly appreciated.

It's on the exhaust manifold on the passenger side, rear of the engine. But the problem is more likely to be the EGR pipe which has a tendancy to get clogged up. Try a search for "104 EGR pipe".

Thanks, just the info about the pipe was very useful. I see it coming off the valve going around the back of the engine. It's hard to see on the drivers side but I was able to feel it going under the intake. Again thanks

EGR on a 1995 MB? That's incredible...that's like mid 70's technology...you sure it's an EGR?

then you must be running leaded gas in a non-catalytic car. The EGR was the primitave precursor for the catalytic convertor. I don't have EGR in my 1990 300TE, last EGR I had was in a 1975 Audi 100LS. Is this a North American version?

My '93 W201 has an EGR Valve.

Picture of an EGR Valve for a 1995 S320:

Attached Thumbnails

 

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

yeah, the 1975 Audi 100 LS was an excellent car when it ran. Mine always ran great, engine wise. problem was the floor rusted out. People always mistaked my 100LS for a Mercedes from a distance, but up close would comment that the Audi looked better than a Mercedes. Sleeker but the same stance.....

Yeah, my wife loved the little car...when it ran, no rust problems. People use to mistake ours for a BMW. Really didn't care for the front wheel drive.

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

Uhh....our 1997 Toyota has one....and it sooted/carboned up the whole intake/throttle to the point of it not idling (stalled out constantly). Had to disassemble the whole thing and clean the heck out of it. After that, no more issues. Most cars have EGR.....

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

EGR is still used today.

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Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.

To clean it you have to take off both ends, and run a speedo cable or such through it. You should find some threads on this. The intake is hard to get but possible. It's held attached with two 10 mm bolts - the front one accessible from the top, the back one better from the bottom.