2004 Mercury Mountaineer Engines

2004 Mercury Mountaineer Engine Assembly (11 parts in stock)
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Engine Assembly (Not Actual Photo)
Summary
Year: 2004change
Make: Mercurychange
Model: Mountaineerchange
Sub Models: Base, Premierchange
Engine Sizes: 4.0L V6 GAS, 4.0L V6 FLEX, 4.6L V8 GASchange
Item: Engine Assembly
Condition: OEM Used
Items Available: 11
Price Range: $1,654 - $2,200 (before local discount)
Local Discount: Up to $100.00
Returns: Cancellation & Return Policy
Item: Engine Assembly change
Condition: OEM Usedchange
Items Available: 11
Price Range: $1,654 - $2,200 (before local discount)
Local Discount: Up to $100.00
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 1-year warranty
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 30-Day Free Returns

Select the right Engine/Motor for your 2004 Mercury Mountaineer

This part may have multiple fitment options depending on your vehicle's engine, drivetrain, and configuration. To ensure proper compatibility, please select the correct fitment below. If you’re unsure, we strongly recommend checking your VIN or vehicle build details before ordering. You can update or change the fitment selection at any time.

Engine/Motor - 4.0L (8th digit, SOHC, 6 Cyl, 245 cid) VIN E (8th digit)
Select FitmentThis fitment option is for 2004 Mercury Mountaineer VIN K (8th digit) with 4.0L Naturally Aspirated Gasoline engine. Designed for vehicles with automatic transmission. Matches vehicles with the 8th digit in the VIN is E. Built to meet Federal (EPA) emissions standards.
Items in stock: 8
Engine/Motor - 4.0L (8th digit, SOHC, 6 Cyl, 245 cid) VIN K (8th digit)
Select FitmentThis fitment option is for 2004 Mercury Mountaineer VIN K (8th digit) with 4.0L Naturally Aspirated Gasoline engine. Designed for vehicles with automatic transmission. Matches vehicles with the 8th digit in the VIN is E. Built to meet Federal (EPA) emissions standards.
Items in stock: 8
Engine/Motor - 4.6L (VIN W, 8th digit)
Select FitmentThis fitment option is for 2004 Mercury Mountaineer 8th digit) with 4.6L Naturally Aspirated Gasoline engine. Designed for vehicles with automatic transmission. Matches vehicles with the 8th digit in the VIN is W. Built to meet Federal (EPA) emissions standards.
Items in stock: 3

Interchange Fitment FAQs

Q: How does interchange fitment work for my 2004 Mercury Mountaineer Engine/Motor?

A: All Engine/Motor options shown on this page are matched to your selected configuration: 2004 Mercury Mountaineer. Used OEM parts are dismantled from donor vehicles as complete assemblies, and a specific interchange fitment is assigned during this process. Every detail shown in the fitment notes must match your vehicle exactly.

Q: What is an interchange fitment option for my 2004 Mercury Mountaineer?

A: An interchange fitment option defines the exact donor vehicle configuration your part came from. For 2004 Mercury Mountaineer, this may include engine size, VIN code, transmission model, drivetrain, axle ratio, and other critical identifiers. This data comes from VIN decoding, OEM information, and physical inspection of the donor vehicle.

Q: Why must every fitment detail match for my 2004 Mercury Mountaineer?

A: Used OEM parts are not universal. If any fitment detail for your 2004 Mercury Mountaineer differs from what is shown in the fitment notes, the Engine/Motor may not install, communicate with your vehicle, or function correctly. Always verify all fitment details before ordering.

Q: Where does the fitment information for my 2004 Mercury Mountaineer come from?

A: Fitment information is captured when the donor vehicle is dismantled. The yard decodes the VIN for 2004 Mercury Mountaineer, checks OEM data and interchange databases, and verifies details during physical inspection. The resulting fitment is then assigned to the Engine/Motor assembly.

Q: What if there are multiple fitment options for my 2004 Mercury Mountaineer?

A: Many 2004 Mercury Mountaineer vehicles were built with multiple configurations in the same year and trim. Trim name alone (XLT, Limited, Sport, etc.) is not enough. You must match the exact configuration shown in the fitment notes—such as engine size, transmission type, drivetrain, and axle ratio—before selecting a Engine/Motor.

Q: Where can I find my 2004 Mercury Mountaineer VIN??

A: You can find the VIN for your 2004 Mercury Mountaineer on the driver-side dashboard (visible through the windshield), inside the driver-side door jamb, and on your registration or insurance documents. The VIN helps confirm the correct configuration and fitment.

Q: How do I verify the correct engine fitment for my 2004 Mercury Mountaineer?

A: For engine fitment, verify engine size (e.g., 2.7L, 3.5L, 5.0L), VIN engine code, fuel type, and whether the engine is turbocharged or naturally aspirated. These details must match the fitment notes for your 2004 Mercury Mountaineer exactly before you select an engine.

Q: Where can I find my engine VIN code or engine ID on my 2004 Mercury Mountaineer?

A: Engine identifiers can often be confirmed through VIN decoding, emissions labels under the hood, under-hood information stickers, and dealer service records for your 2004 Mercury Mountaineer. Use this information to match the engine fitment exactly.

Attention!

There are 3 Engine Assembly choices for the 2004 Mercury Mountaineer!!!
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Engine Assembly (11)

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