2003 Mercury Grand Marquis Service and Repair Manual
The 2003 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
- LSE 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
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
A loss of headlights can reduce driver visibility and increase the risk of a crash.
Ford will notify owners, and dealers will replace the LCM, free of charge. The recall began April 1
SUMMARY TO BE PROVIDED ON A FUTURE DATE.
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
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
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
WDS COP KIT DIAGNOSTIC TIP - COIL ON PLUG (COP) IGNITION SYSTEMS - ENGINE MISFIRE OR ROUGH RUNNING. *TT
NUMEROUS ANTI-LOCK BRAKE SYSTEM (ABS) WHEEL SPEED SENSOR (WSS) DTCS, SUCH AS C1145, C1155, C1165, C1175, C1296, C1297, C1298, C1299 AND C1222. *TT
UNCOMMANDED WINDSHIELD WIPER OPERATION. *TT
ALUMINUM CORROSION - SERVICE TIP. *TT
Showing the 8 most recent of 88 technical service bulletins on file with NHTSA.
AFTER STARTING AND SHIFTING INTO DRIVE THE ENGINE RACED AND THERE WAS UNEXPECTED ACCELERATION AND THE CAR WOULD NOT STOP EVEN WHILE APPLYING BRAKE. TURNED VEHICLE OFF AFTER CRASH AND THE ENGINE CONTI
AFTER STARTING AND SHIFTING INTO DRIVE THE ENGINE RACED AND THERE WAS UNEXPECTED ACCELERATION AND THE CAR WOULD NOT STOP EVEN WHILE APPLYING BRAKE. TURNED VEHICLE OFF AFTER CRASH AND THE ENGINE CONTI
Its the LCM L(IGHT CONTROL MODULE)...HEAD LIGHTS went out on me one night coming down [XXX] causing me to wreck in a ditch and hitting a light pole INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INF
Its the LCM L(IGHT CONTROL MODULE)...HEAD LIGHTS went out on me one night coming down [XXX] causing me to wreck in a ditch and hitting a light pole INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INF
Its the LCM L(IGHT CONTROL MODULE)...HEAD LIGHTS went out on me one night coming down [XXX] causing me to wreck in a ditch and hitting a light pole INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INF
Showing the 5 most serious of 449 complaints filed with NHTSA.
