Mercury ECU ECM PCM | Part Number 859610T48 | Fits 1999–2003 Mercury 250XB 3.0L EFI 250HP V6 | 1-Year Warranty

Product Overview

Restore reliable engine performance with this genuine Mercury ECU (Engine Control Unit), Part Number 859610T48, designed for select 1999–2003 Mercury 250XB 3.0L EFI V6 250HP outboard engines. The ECU is responsible for controlling critical engine functions such as fuel delivery, ignition timing, and overall engine management, ensuring smooth and efficient operation. This OEM Mercury ECU has been professionally tested using a CDI Electronics diagnostic tester to verify proper functionality before being offered for sale. With proven performance and a 1-Year Warranty, it provides a dependable replacement for a faulty or damaged engine control module.

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Key Features

• Genuine OEM Mercury Engine Control Unit
• OEM Part Number: 859610T48
• Professionally CDI Tested
• Confirmed Good Working Condition
• Fits Mercury 250XB 3.0L EFI V6 Outboards
• Ready for Installation
• 1-Year Warranty Included
• Securely Packaged for Shipping

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Technical Specifications

Specification	Details
Brand	Mercury
Product Type	Engine Control Unit (ECU/ECM/PCM)
Condition	Pre-Owned
OEM Part Number	859610T48
Engine Compatibility	3.0L EFI V6
Horsepower	250 HP
Model	250XB
Model Years	1999–2003
Engine Hours Displayed	666 Hours

Replaces OEM Part Numbers

• 83004419S
• 85961043
• 85961004S
• 859610R04
• 8M0086573

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Compatible Applications

Designed for select Mercury outboard engines including: Model

• Mercury 250XB

Engine

• 3.0L EFI V6

Horsepower

• 250 HP

Model Years

• 1999
• 2000
• 2001
• 2002
• 2003

Important: Always verify your engine's model number, serial number, and OEM part number before purchasing. If you're unsure about compatibility, our team is happy to assist.

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Condition

This is a genuine OEM Mercury ECU in excellent used condition. The unit has been professionally tested using CDI diagnostic equipment and confirmed to be in proper working order.

• CDI tested and verified functional
• No visible physical damage
• Clean electrical connectors
• Displays 666 engine hours
• Ready for installation

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What's Included

Your purchase includes:

• Mercury ECU / ECM / PCM
• OEM Part Number 859610T48

No wiring harnesses, sensors, mounting hardware, or additional electronic components are included unless shown in the product photos.

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Shipping Information

Every ECU is carefully packaged to protect sensitive electronic components during transit. We offer fast shipping throughout the United States, with international shipping available upon request. For an accurate shipping quote, please provide:

• Country
• ZIP or Postal Code
• Commercial or Residential Address

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Warranty

This Mercury ECU is backed by a 1-Year Warranty. If the unit experiences a covered failure during normal use within the warranty period, EZ Boats Marine will repair, replace, or refund the item if a replacement is unavailable, in accordance with our warranty policy.

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Why Buy from EZ Boats Marine?

• Genuine OEM Mercury Marine Parts
• Professionally CDI Tested Electronics
• 1-Year Warranty for Added Confidence
• Secure Packaging
• Fast Nationwide and International Shipping
• Competitive Pricing
• Knowledgeable Customer Support
• Trusted Source for Outboard Motors and Marine Parts

EZ Boats Marine is committed to supplying dependable OEM marine components backed by exceptional customer service and reliable support.

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Frequently Asked Questions

Which engines does this ECU fit?

This ECU is designed for select 1999–2003 Mercury 250XB 3.0L EFI V6 250HP outboard engines. Always verify your OEM part number and engine serial number before ordering.

Has this ECU been tested?

Yes. The unit has been professionally tested using CDI Electronics diagnostic equipment and confirmed to be in good working condition.

Which part numbers does this ECU replace?

This ECU replaces the following OEM part numbers:

• 83004419S
• 85961043
• 85961004S
• 859610R04
• 8M0086573

What do the 666 engine hours represent?

The ECU displays 666 engine hours, which were recorded on the donor engine at the time of removal.

Does this ECU include a warranty?

Yes. This ECU is backed by a 1-Year Warranty, providing added peace of mind with your purchase.