It did report fault code numbers as I recall. I think they were 3 digit, and they did follow up with an explanation.

Again, it has been several years since I used your unit, and my memory is a bit foggy on this.

I had lots of notes (including the numbers and explanations) while trying to diagnose the issues with the 400E, but I'm sure I tossed those after I sold the car.

I know if you plug it into cousin Susie's 95 E320 wagon, you'll be sure to find at least a dozen set codes.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles