2003 Mercury Mountaineer Service and Repair Manual

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Factory-Grade Data

The 2003 Mercury Mountaineer Service and Repair Manual is a practical, workshop-ready reference for maintenance, diagnostics, and repairs. Use it to troubleshoot symptoms, follow step-by-step procedures, verify specifications, and confirm wiring and connector locations before replacing parts.

Ideal for technicians and DIY owners, it supports everything from routine service to deeper mechanical and electrical work—including drivability, no-start, warning lights, overheating, brake and suspension issues, HVAC faults, and circuit testing.

Trims covered

  • Base Sport Utility 4-Door

Engines covered

  • 4.0L 245Cu. In. V6 FLEX SOHC Naturally Aspirated
  • 4.6L 281Cu. In. V8 GAS SOHC Naturally Aspirated

What’s inside

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams

Why this manual matters

  • Faster diagnostics with system-based troubleshooting and wiring diagrams
  • Clear procedures and reference sections to reduce guesswork and rework
  • Helpful for maintenance planning and verifying parts/specs before repairs

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Vehicle Safety Data

2003 Mercury Mountaineer Recalls & Complaints

NHTSA #07E10400011/12/2007Component: VISIBILITY:GLASS, SIDE/REAR

CERTAIN CURVED TEMPERED REPLACEMENT GLASS MANUFACTURED BY HANGZHOU SAFETY GLASS LTD AND SUPPLIED TO SAFELITE BY AUTO TEMP INC., IDENTIFIED AS DOT-430, AND SOLD FOR USE ON CERTAIN DOMESTIC AND FOREIGN

Consequence

IN THE EVENT OF A VEHICLE CRASH, THE OCCUPANT(S) MAY BE SERIOUSLY INJURED BY SHATTERED GLASS.

Remedy

SAFELITE WILL NOTIFY ITS RETAIL CUSTOMERS AND REPLACE THE GLASS FREE OF CHARGE. RETAIL CUSTOMERS CAN

TSB #10156863

Some 2000 and newer Ford, Lincoln and Mercury vehicles equipped with aluminum body panels may exhibit corrosion concerns appearing as bubbled and/or peeling paint with or without accompanying white dust. Panel replacement is recommended. Fo

TSB #10155551

Some 2000 and newer Ford, Lincoln and Mercury vehicles equipped with aluminum body panels may exhibit corrosion concerns appearing as bubbled and/or peeling paint with or without accompanying white dust. Panel replacement is recommended. Fo

TSB #10028736

FORD: SOME VEHICLES MAY EXHIBIT OIL SEPARATION FROM THE INTERNAL LUBE FOUND IN THE UNITIZED CARTRIDGE SEAL. OIL SEPARATION APPEARS TO BE AND IS OFTEN MISDIAGNOSED, AS AN AXLE LUBE LEAK. *PE

TSB #10023943

SOME 1997-2008 VEHICLES EQUIPPED WITH A 4.6L 2V, 5.4L 2V, OR 6.8L 2V ENGINE--SPARK PLUG THREAD REPAIR PROCEDURE--NOT COVERED UNDER NEW VEHICLE LIMITED WARRANTY. *NJ THIS INCLUDES F-53 MOTORHOME CHASSIS. UPDATED 2/23/10. *PE

TSB #10019800

LOW OIL PRESSURE INDICATION/WARNING, A/C COMPRESSOR INOPERATIVE AND/OR NO CRANK CONDITION ON 4.6L EQUIPPED VEHICLES. *TT

TSB #10019384

LOW TIRE INDICATOR ON - TPMS SYSTEM SENSOR WAKE UP. *TT

TSB #10019379

MALFUNCTION INDICATOR LAMP ON WITH PCM DIAGNOSTIC TROUBLE CODE P0463 AND/OR IC DIAGNOSTIC TROUBLE CODE B1201 - FUEL GAUGE DROPS TO EMPTY OR SLOW TO UPDATE AFTER REFUELING. *TT

TSB #10018745

WDS COP KIT DIAGNOSTIC TIP - COIL ON PLUG (COP) IGNITION SYSTEMS - ENGINE MISFIRE OR ROUGH RUNNING. *TT

Showing the 8 most recent of 120 technical service bulletins on file with NHTSA.

20200816Component: POWER TRAINCrash reported1 injured

BIG O TECHS CONNED WIFE INTO BUYING 2 TIRES AND WE OWN AWD SUV THAT REQUIRES 4 AT THE SAME INTERVALS .I IMMEDIATELY NOTIFY THEM THAT THIS IS NOT SAFE AND WILL DAMAGE MY CAR THEY CONTINUED FOR OVER 2 M

20200816Component: WHEELSCrash reported1 injured

BIG O TECHS CONNED WIFE INTO BUYING 2 TIRES AND WE OWN AWD SUV THAT REQUIRES 4 AT THE SAME INTERVALS .I IMMEDIATELY NOTIFY THEM THAT THIS IS NOT SAFE AND WILL DAMAGE MY CAR THEY CONTINUED FOR OVER 2 M

20200816Component: UNKNOWN OR OTHERCrash reported1 injured

BIG O TECHS CONNED WIFE INTO BUYING 2 TIRES AND WE OWN AWD SUV THAT REQUIRES 4 AT THE SAME INTERVALS .I IMMEDIATELY NOTIFY THEM THAT THIS IS NOT SAFE AND WILL DAMAGE MY CAR THEY CONTINUED FOR OVER 2 M

20160415Component: SEATSCrash reported1 injured

TL* THE CONTACT OWNS A 2003 MERCURY MOUNTAINEER. WHILE THE CONTACT'S VEHICLE WAS APPROACHING A RED LIGHT, ANOTHER VEHICLE CRASHED INTO ITS REAR AT A MODERATE RATE OF SPEED. THE SEAT BACK AND THE HEADR

20100103Component: POWER TRAIN:AUTOMATIC TRANSMISSIONCrash reported1 injured

I HAVE A 2003 MERCURY MOUNTAINEER AND I AM HAVING TRANSMISSION PROBLEMS NOW. I HAD AN ACCIDENT BACK IN JUNE 2009 WHERE MY VEHICLE ROLLED OUT OF THE YARD AND HIT THE NEIGHBORS HOUSE AND I WAS HURT IN

Showing the 5 most serious of 220 complaints filed with NHTSA.

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