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To remove and replace the ECU in a 1974 Mercedes 450SL, first disconnect the car's battery to ensure safety. Locate the ECU, which is typically found under the dashboard or near the firewall, and carefully unplug the connectors. Remove any mounting screws or brackets securing the ECU, then take it out. To install the new ECU, reverse the process: secure it in place, reconnect the connectors, and finally reconnect the battery.

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1mo ago

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