I have had an ongoing check engine light problem on my '95 E320. I have checked vacuum lines, cleaned the pipe leading up to the valve and finally replaced the valve. It was good for about 1000 miles and then lit up again. I had last filled up at a full serve station and when I checked the cap it was not fully tightened to the second "position". I reset the light under the hood and have my fingers crossed. Do you think that was the problem?

The fuel tank & cap are NOT monitored on that model!

WHAT code are you getting?

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I am getting 5 flashes - EGR inoperative. I was hoping it might be the gas cap!

It's most likely a plugged EGR tube: do a search and you'll see your solution.

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Regards . . . . JimF
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'94 S500 Cpe

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I cleared out the tube on my 94 E320 this spring and the CEL has not turned on since.

The tube needs to be cleared out at the intake manifold. Follow the pipe from the EGR valve to the intake. It goes behind the head, in between the head and the firewall, where you wont see it. It comes back into view where it's fastened to the oil filter housing, then runs to where it mates to the intake. I was able to get the two 10MM (i think) bolts off with a couple of extensions and a universal. I then pulled the tube away from the intake and up (or down) a little. The afflicted, clogged portion is only about a 1/4 inch in and theres some junk in the intake hole, was careful to get it out without pushing it in. For tube and hole, I used a thick round wound guitar string.

Its one of those procedures you've just got to figure out by doing it. A little common sense and a light touch, you should not have any problems.

Good luck.