| Summary | |||
|---|---|---|---|
| Year: | 2003change | ||
| Make: | Mercurychange | ||
| Model: | Mountaineerchange | ||
| Sub Models: | Basechange | ||
| Engine Sizes: | 4.0L V6 FLEX, 4.6L V8 GASchange | ||
| Item: | Engine Assembly | ||
| Condition: | OEM Used | ||
| Items Available: | 11 | ||
| Price Range: | $1,802 - $2,418 (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: | $1,802 - $2,418 (before local discount) |
| Local Discount: | Up to $100.00 |
Quality Tested Parts
Nationwide Shipping
1-year warranty
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30-Day Free ReturnsSelect the right Engine/Motor for your 2003 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 VIN E (8th digit, without flex fuel, 6 Cyl, 245 cid)
Select FitmentThis fitment option is for 2003 Mercury Mountaineer 6-245) with 4.0L Naturally Aspirated Flex Fuel 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: 1
Items in stock: 1
Engine/Motor - 4.0L VIN K (8th digit, flex fuel, 6 Cyl, 245 cid)
Select FitmentThis fitment option is for 2003 Mercury Mountaineer 6-245) with 4.0L Naturally Aspirated Flex Fuel engine. Designed for vehicles with automatic transmission. Matches vehicles with the 8th digit in the VIN is K. Built to meet Federal (EPA) emissions standards.
Items in stock: 7
Items in stock: 7
Engine/Motor - 4.6L (VIN W, 8th digit)
Select FitmentThis fitment option is for 2003 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
Items in stock: 3
Interchange Fitment FAQs
A: All Engine/Motor options shown on this page are matched to your selected configuration:
2003 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.
A: An interchange fitment option defines the exact donor vehicle configuration your part came from. For 2003 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.
A: Used OEM parts are not universal. If any fitment detail for your 2003 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.
A: Fitment information is captured when the donor vehicle is dismantled.
The yard decodes the VIN for 2003 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.
A: Many 2003 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.
A: You can find the VIN for your 2003 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.
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 2003 Mercury Mountaineer exactly before you select an engine.
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 2003 Mercury Mountaineer.
Use this information to match the engine fitment exactly.
Enter your Zip Code below to find parts near you. The more local you shop, the more you save off the original sale price!
Attention!
There are 3 Engine Assembly choices for the
Verify Your Part
Engine Assembly (11)
Available Parts
- Engine Assembly (11)
- Transmission Assembly (12)
- A/C Control (9)
- Air Flow Meter/Sensor (5)
- Alternator (44)
- Chassis Computer (15)
- Combination Switch (-)
- Convertible Top Lift (-)
- Convertible Top Motor (-)
- DC Converter (Electric Car) (-)
- Distributor (-)
- Electric Door Motor (-)
- Engine Computer/Control Unit (3)
- Fuse Box (410)
- Headlight/Headlamp Motor (-)
- Heater Motor (8)
- Ignition Coil (-)
- Ignition Switch W/Key (138)
- Power Window Motor (2)
- Power Window Switch (-)
- Quarter Window Motor (-)
- Starter (56)
- Sun Roof Motor (-)
- Tailgate Lift Motor (-)
- Tailgate Motor (-)
- Windshield Washer Motor (-)
- Wiper Motor, Front (4)
- Wiper Motor, Rear (4)
- Wiper Transmission (-)
- A Pillar (3)
- Back Window (1)
- Bed Rail (-)
- Bumper Assembly, Front (-)
- Bumper Assembly, Rear (-)
- Bumper Bar, Front (1)
- Bumper Bar, Rear (4)
- Bumper Cover, Front (-)
- Bumper Cover, Rear (-)
- Cab Corner (-)
- Door Assembly, Back (-)
- Door Assembly, Front (4)
- Door Assembly, Rear (7)
- Door Handle, Rear (-)
- Door Latch, Rear (-)
- Door Mirror, Side (4)
- Door Trim Panel, Front (5)
- Door Vent Glass, Front (-)
- Door Window, Front (4)
- Door Window, Rear (2)
- Fender (2)
- Front Clip (-)
- Fuel Tank (-)
- Grille (2)
- Ground Effects (-)
- Header Panel (-)
- Headlight/Headlamp Door (-)
- Hood (1)
- Pillar (5)
- Quarter Panel (5)
- Quarter Window (9)
- Quarter Window Regulator, Rear (-)
- Radiator Support (1)
- Rear Clip Assembly (-)
- Rear Fender Assembly (-)
- Rear Trim Panel (5)
- Rear Vent Window (2)
- Roof (3)
- Roof Glass (-)
- Running Board (-)
- Tail Finish Panel (-)
- Tail Panel (-)
- Tailgate Assembly (-)
- Tires (-)
- Tires, Set (-)
- Tonneau Cover (-)
- Truck Bed (-)
- Truck Cab (-)
- Trunk Lid Pull Down (-)
- Valance, Front (-)
- Wheel Cover (-)
- Wheel Rim (60)
- Windshield Glass (-)
- Air Bag (10)
- Armrest (-)
- Cargo Cover (-)
- Console (9)
- Cruise Control Servo (-)
- Dash Assembly (-)
- Dash Panel (4)
- Gas Pedal (-)
- Glove Box (2)
- GPS / Info Screen (1)
- Head Up Display (-)
- Headrest (-)
- Inside Door Handle (-)
- Instrument Cluster (-)
- Interior, Complete (-)
- Jack Assembly (4)
- Night Vision Camera (-)
- Overhead Console (-)
- Radio / CD Player (102)
- Rear View Mirror (3)
- Roof Rack (2)
- Seat Track, Front (-)
- Seat, Front (35)
- Seat, Rear (-)
- Seat, Third Row (6)
- Seatbelt (12)
- Shift Lever (-)
- Speedometer (5)
- Steering Wheel (1)
- Sun Visor (139)
- Trailer Hitch (-)
- ABS Control Module/Pump (31)
- Air Injection Pump (-)
- Air Spring (-)
- Axle Carrier, Rear (131)
- Axle Housing (-)
- Axle Shaft (10)
- Axle, Front (-)
- Axle, Rear (-)
- Back Axle (-)
- Brake Master Cylinder (5)
- Bumper Shock (-)
- Cab Clip (-)
- Camshaft (-)
- Cylinder Head (-)
- Differential Assembly, Rear (-)
- Drive Shaft, Front (1)
- Drive Shaft, Rear (369)
- Engine Oil Cooler (-)
- Engine Pullout (-)
- Exhaust Manifold (-)
- Flywheel (25)
- Frame (16)
- Fuel Pump (-)
- Harmonic Balancer (-)
- Hub Bearing (-)
- I Beam (-)
- Intake Manifold (-)
- Leaf Spring, Front (-)
- Leaf Spring, Rear (-)
- Lower Control Arm, Front (-)
- Lower Control Arm, Rear (-)
- Muffler (-)
- Oil Pan (-)
- Power Brake Booster (5)
- Power Steering Pump (47)
- Radiator Overflow Bottle (5)
- Ring Gear And Pinion (-)
- Shock Absorber (-)
- Shock, Front (4)
- Shock, Rear (5)
- Spindle (-)
- Spoiler, Rear (-)
- Steering Column (-)
- Steering Gear (1)
- Strut (-)
- Stub Axle, Rear (-)
- Suspension Compressor (-)
- Suspension Cross Member (-)
- Throttle Body (23)
- Timing Cover (-)
- Torque Converter (-)
- Torsion Bar (-)
- Transfer Case Assembly (2)
- Transfer Case Motor (-)
- Transmission Cooler (2)
- Turbo (-)
- Upper Control Arm, Front (-)
- Upper Control Arm, Rear (-)
- Vacuum Pump (-)
- Valve Cover (-)
- Water Pump (-)
- Window Regulator, Front (3)
- Window Regulator, Rear (2)
