8257542 Mercury MerCruiser ECU – Engine Control Unit (OEM)

8257542 Mercury MerCruiser ECU – Engine Control Unit (OEM)

This OEM Mercury MerCruiser ECU (Engine Control Unit) is a critical component of your marine engine’s electronic management system. Designed to ensure optimal engine performance, fuel efficiency, and emissions control, this ECU is a direct replacement for part number 8257542.

Built to factory specifications, it delivers precise control over ignition timing, fuel delivery, and engine diagnostics. Ideal for restoring reliability to your MerCruiser-powered boat, especially if you’re experiencing performance issues or electronic faults.

• OEM Mercury MerCruiser Part #: 8257542

• Controls ignition, fuel injection, and engine diagnostics

• Designed for reliable marine operation in harsh conditions

• Plug-and-play replacement—no programming required (in most cases)

• Compatible with select MerCruiser inboard engine models