Ivanerrol, check with your local MB dealer or salvage yard for an ECU for a 300SL. I had the same experience obtaining an ECU for our daughter's 1991 300CE and she was without the car for months. Finally after discussing the situation with the owner of our local MB dealer the Parts Department Manager realized the ECU for the 300SL is the same part. Apparently the MB Parts System shows the 300CE ECU's as backordered and unavailable. The new ECU cost around $2,300.

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Fred Hoelzle