I recently purchased a 1994 E320 sedan with a 3.2L DOHC motor. The car ran perfectly for several month's and literally out of the blue began running horribly. I had it towed to the local dealer which informed me the engine harness and spark plugs were "coding", as the spark plugs were not the proper ones for the vehicle and the harness was damaged and had been repaired at one point. I had the harness replaced and the car tuned-up, fluids etc., and everything else checked out as new or in "new" condition. Within 24 hours the check engine light came on again and the dealer retrieved codes number 005 and 008, from the computer but stated that they were not "actively failing", only intermittant, and were old "stored" codes. The car runs very well, but appears to run a bit hotter than before (inbetween the line above the line marked 80, and before the the line approaching the red zone) I've read the posting on the egr valve and testing there-of, but how do I diagnose and where is the temperature sending unit (008 I think), and the EGR valve located on my engine?
Thanks

CE still on???

Yes.

Go back in and get existing codes.

Key ON
Press DM Led button for 2 secs.....release.
Count flashes as they come back
Repeast until all codes have appeared. Write them down and then clear all codes.

To clear, hold button for 8 secs after each code appears.
Turn key Off for 50 secs , On for 10 secs and start car .. Codes will be clear and CE should be out.

Post findings

Don't have a code reader or manual yet so I'm relying solely on the code printout from the dealer at this point. Could you provide instruction on the location of the egr valve and temperature sending unit so I could perform a visual inspection of the vacuum hoses, wiring and general condition of these components?
Thanks,

94E

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Don't have a code reader or manual yet so I'm relying solely on the code printout from the dealer at this point.>>

Your car has a code retrieve set-up right under the hood.
A black box in front of the battery with a press button and LED light on it.

Do a search on Code Retrieve for procedure or follow the instructions I posted for you and post your findings