Deanyel,

I agree with you that it seems that the code 11 is a likely clue, but if the speed sensor were not sensing the engagement of the clutch, wouldn't it render code 13? (Excessive A/C compressor clutch slippage)

How difficult is it to replace the speed sensor? It is probably the original device, and the car is getting up in years...

I want to be careful not to just replace things because I suspect them. I can see many, many $$$ flowing out the window as I pursue this problem.

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02 S500
92 500SL
92 400E (Sold)
87 300E (Sold)
83 300D Turbo (Sold)
75 300D (Sold)
74 240D (Sold after 20 years)