2004 Mercury Grand Marquis Service and Repair Manual

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Factory-Grade Data

The 2004 Mercury Grand Marquis 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

  • GS Sedan 4-Door
  • LS Sedan 4-Door

Engines covered

  • 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

2004 Mercury Grand Marquis Recalls & Complaints

NHTSA #15V86100022/12/2015Component: EXTERIOR LIGHTING:HEADLIGHTS

Ford Motor Company (Ford) is recalling certain model year 2003-2005 Ford Crown Victoria and Mercury Grand Marquis vehicles manufactured October 3, 2001, to August 2, 2005. The affected vehicles have

Consequence

A loss of headlights can reduce driver visibility and increase the risk of a crash.

Remedy

Ford will notify owners, and dealers will replace the LCM, free of charge. The recall began April 1

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 #10109070

The Powertrain Control/Emissions Diagnosis (PC/ED) manual has been revised for diagnosing electronic throttle bodies (ETBs). The ETC_ACT and ETC_DSD PIDs should not used to diagnose possible ETB concerns. The IDS has a limited refresh rate

TSB #10074793

SUMMARY TO BE PROVIDED ON A FUTURE DATE.

TSB #10056190

FORD: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. INFORMATION REGARDING THE LIGHTING CONTROL MODULE EXTENDED WARRANTY COVERAGE, FOR SOME VEHICLES, TO 15 YEARS OR 250,000 MILES, WHICHEVER OCCURS FIRST. MODEL 2003-2005 VICTORIA, GRAND MARQUI

TSB #10055936

FORD: THE LIGHTING CONTROL MODULE HAS EXTENDED WARRANTY COVERAGE, ON CERTAIN VEHICLES, DUE TO A POSSIBLE CRACK ON SOLDER JOINT THAT CONNECTS RELAY TO CIRCUIT BOARD. MODEL 2003-2005 CROWN VICTORIA, GRAND MARQUIS. *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 #10020077

CATALYTIC CONVERTER BRICK RATTLE OR BUZZING NOISE. *TT

Showing the 8 most recent of 49 technical service bulletins on file with NHTSA.

20051025Component: FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEMCrash reportedFire reported

DT: THE CONTACT STATED WHILE DRIVING VEHICLE CAUGHT ON FIRE. THERE WERE NO WARNING SIGNS INDICATING A PROBLEM WITH THE VEHICLE. HE NOTICED SMOKE COMING FROM THE FLOORBOARD AND THE DASHBOARD. WHEN

20160510Component: STEERINGCrash reported2 injured1 fatalities

MY WIFE AND 4 YEAR OLD DAUGHTER WERE STRUCK BY A 2004 MERCURY GRAND MARQUIS ON 04/21/16. THEY WERE DRIVING IN EASTBOUND TRAFFIC IN A 2008 NISSAN ULTIMA AND THE DRIVER OF THE MERCURY GRAND MARQUIS WAS

20170714Component: AIR BAGSCrash reported1 injured

I HAVE HAD MORE PROBLEMS WITH MY 2004 GRAND MARQUIS, THE LIGHTS DON'T WORK, HEADLIGHTS GO OFF WHILE DRIVING AT NIGHT, AIRBAGS DON'T WORK, ELECTRICAL, SEATS, STEERING, BRAKES, ALL OF THE ELECTRICAL, CA

20170714Component: ELECTRICAL SYSTEMCrash reported1 injured

I HAVE HAD MORE PROBLEMS WITH MY 2004 GRAND MARQUIS, THE LIGHTS DON'T WORK, HEADLIGHTS GO OFF WHILE DRIVING AT NIGHT, AIRBAGS DON'T WORK, ELECTRICAL, SEATS, STEERING, BRAKES, ALL OF THE ELECTRICAL, CA

20170714Component: STEERINGCrash reported1 injured

I HAVE HAD MORE PROBLEMS WITH MY 2004 GRAND MARQUIS, THE LIGHTS DON'T WORK, HEADLIGHTS GO OFF WHILE DRIVING AT NIGHT, AIRBAGS DON'T WORK, ELECTRICAL, SEATS, STEERING, BRAKES, ALL OF THE ELECTRICAL, CA

Showing the 5 most serious of 422 complaints filed with NHTSA.

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