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Old 10-04-2003, 11:47 PM
iozero iozero is offline
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Join Date: May 2000
Posts: 50
I don't know about a '74 450sl but on my 1980 450 sl the ECU is under the floor mat close to the firewall on the passenger side of the vehicle. It is under a trap door that is held on with one screw.

Good luck. Hope your ECU isn't a windows based one (crash!)
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Jim Loseke
1980 450Sl "Black Beauty"
2002 C230 Kompressor "Spicy"
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