Most common 2003 Mercury Grand Marquis problems
Share of the 362 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
Mercury Grand Marquis complaints by model year
Best Grand Marquis years: 2011, 2010, 2009. Years to avoid: 2005, 1997, 1996, 2003. Compare all years →
2003 Mercury Grand Marquis recalls (1)
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 a lighting control module (LCM) that may fail, resulting in a loss of headlights.
Remedy: Ford will notify owners, and dealers will replace the LCM, free of charge. The recall began April 14, 2017. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 15S39.
NHTSA defect investigations
Federal safety investigators have looked into 6 possible defects involving the 2003 Mercury Grand Marquis:
Loss of headlights
The Office of Defects Investigation (ODI) opened an investigation concerning the loss of headlights in model year (MY) 2003-2005 Ford Crown Victoria and Mercury Grand Marquis vehicles. The subject vehicles share the same architecture and major components.ODI has received 636 unique reports (for all submission dates) related to the alleged defect, with owners describing a loss of both low and/or high beam headlights…
Loss of headlight function
The agency has closed this investigation based on its review of complaint reports, field and technical data provided by Ford and complainant interviews. Ford found that some lighting control modules (lcm) in the subject vehicles contained defective solder joints on the printed circuit board.this condition can lead to poor headlight performance ranging from intermittent outage and dimming to eventual headlights…
Rear axle fracture
This pe was opened after odi became aware of two allegations concerning rear axle fracture and partial wheel separation involving my 2003 Ford crown victoria police interceptors (cvpi).initially, the pe's scope involved all my 2003 grand marquis, crown victoria, and Lincoln town cars (I.e., panther platform) produced through January 2003.while gathering information about this issue, it became evident that the…
Fracture of the steel wheel rim
The subject wheel (new for my 2003) is used on crown victoria (cv) and grand marquis.complaint data indicates that wheel failure affects primarily the commercial specification cv model (police and taxi) which has unique design characteristics and is generally subjected to higher usage demands.during Ford's analysis, it was determined that cyclic bending moment fatigue could cause rim cracks to occur in the heat…
Loss of headlamp/exterior lighting
In a letter dated October 2, 2014 the Office of Defects Investigation (ODI) was initially petitioned by the North Carolina Consumers Council, Inc. requesting a defect investigation of an alleged defect condition resulting in headlight and/or exterior lighting failure on 2003-2005 Ford Crown Victoria and Mercury Grand Marquis vehicles.ODI analyzed Vehicle Owner Questionnaire (VOQ) complaints received from consumers…
Spark plug ejection from cylinder head
On September 6, 2005, odi received a petition requesting that the agency investigate allegations of engine spark plug ejection in certain model year 1997 through 2004 Ford vehicles with triton v-8 and v-10 engines.odi received a total of 474 non-duplicative complaints on the subject vehicles where the complainant, or the dealer repairing the vehicle, reported that a spark plug detached from the cylinder and/or…
What 2003 Mercury Grand Marquis owners say
Lights all 207 →
The contact owns a 2003 Mercury Grand Marquis. The contact that the headlights were intermittently inoperable. Additionally, the contact stated that the instrument panel lights, the brake lights, and the turn signal lights were inoperable. The contact who is a mechanic, had inspected the fuses, the fuse box, and other unknown parts, but found no failures. The dealer was notified of the failure. The vehicle was not diagnosed or repaired. The contact related the failure to NHTSA Campaign Number: 15V861000 (Exterior Lighting); however, the VIN was not included. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 160,000.
The contact owns a 2003 Mercury Grand Marquis. The contact stated that upon purchase of the vehicle, he received notification of NHTSA Campaign Number: 15V861000 (Exterior Lighting). Over time, the contact stated that the headlights and taillights would intermittently fail to operate without warning. The vehicle was taken to the dealer and the recall repair was performed. Despite the recall repair, the contact stated that the taillights failed to operate. The dealer was informed of the failure and the contact was informed that he had to pay out of pocket for the repair. The manufacturer was notified of the failure. The vehicle was not repaired. The failure mileage was approximately 190,000.
Electrical system all 51 →
I started Mercury with foot on break like normal. Shifted into reverse. Car accelerated backwards at full speed. Brakes did not stop car. Attempted to shift into neutral but went into drive instead. Car accelerated forward at full speed with my foot still on break. Car hit metal post and tree knocking them down and dragging the tree 50 to 60 feet before stopping with my foot still on the break. Car had stopped accelerating. I turned off the ignition. This unintended acceleration had happened before. Two different dealers attempted to fix the problem. Both of them thought they had been successful but it happened again. Previously, applying the brakes stopped the car, but not this time. Someone could have been injured severely or killed.
The contact owns a 2003 Mercury Grand Marquis. The contact that the headlights were intermittently inoperable. Additionally, the contact stated that the instrument panel lights, the brake lights, and the turn signal lights were inoperable. The contact who is a mechanic, had inspected the fuses, the fuse box, and other unknown parts, but found no failures. The dealer was notified of the failure. The vehicle was not diagnosed or repaired. The contact related the failure to NHTSA Campaign Number: 15V861000 (Exterior Lighting); however, the VIN was not included. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 160,000.
Suspension all 28 →
Almost had accidents because lights failed, headlights and taillights failed at night, including dash lights today, creating safety hazard. Seat tilt failed, and body mount frame bushing failed. Mirror tilt switch failed. Fuel filler neck leaks when filled. Very scary especially at night. Please recall and fix before we get hurt.
Tl* the contact owns a 2003 Mercury Grand Marquis. While driving 25 MPH, the contact heard a sound from the rear driver side tire. The contact took the vehicle to a mechanic who advised that the rear of the vehicle needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The contact referenced NHTSA campaign number: 04V328000(suspension). The VIN was not included. The failure mileage was approximately 117,000.
2003 Mercury Grand Marquis engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined |
|---|---|---|---|
| 4.6L 8-cyl | 4-speed automatic | RWD | 16 / 23 / 18 |
EPA ratings. Class: Large car.
Frequently asked questions
Is the 2003 Mercury Grand Marquis a good car?
Based on 362 owner complaints filed with NHTSA, the 2003 Grand Marquis rates use caution: 1.5× as many complaints as a typical year of the Grand Marquis at the same age. It is one of the Grand Marquis years we suggest avoiding. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2003 Mercury Grand Marquis?
The lights — 207 complaints, 57% of all complaints for this model year, most often about headlights. Next are the electrical system (51) and suspension (28).
How many recalls does the 2003 Mercury Grand Marquis have?
There is 1 recall for the 2003 Mercury Grand Marquis, the most recent from December 22, 2015 (headlights). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.
What are the best and worst years of the Mercury Grand Marquis?
The best years by complaints, compared at the same age, are 2011, 2010 and 2009. Years to avoid or approach with caution: 2005, 1997, 1996 and 2003. See the full Mercury Grand Marquis years comparison.
At what mileage do 2003 Mercury Grand Marquis problems happen?
The median mileage reported in complaints is about 85,000 miles; 24% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.