Fits MCM V-6 & V-8 (305, 350 & 496 cid) MPI engines with ECM 555

Unnoticed engine knock can quickly turn into serious damage, making the Mercury Knock Sensor (8M6003194) a critical component in keeping your MerCruiser running at peak performance. This sensor continuously monitors vibrations, detecting detonation before it becomes a problem. By sending real-time data to the ECM 555, it allows the engine to fine-tune timing for smoother operation, better fuel efficiency, and long-term durability. If your engine isn’t running as smoothly as it should, or you're experiencing power loss, a faulty knock sensor could be the culprit.

Why This Sensor Matters:

• Prevents Costly Engine Damage – Detects knock early, allowing the ECM to adjust timing and protect internal components.
• OEM Precision Fit – Designed specifically for MerCruiser V-6 and V-8 MPI engines with ECM 555, ensuring accurate readings and easy installation.
• Built for Harsh Conditions – Engineered to withstand the demanding marine environment, offering reliable performance trip after trip.

A failing knock sensor can lead to poor fuel economy and reduced power output. Replacing it with the Mercury Knock Sensor 8M6003194 is a simple way to keep your MerCruiser running efficiently and prevent long-term wear.

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.