"How reliable is the 2003 Mercury Grand Marquis?"

"Based on 447 NHTSA complaints, the 2003 Mercury Grand Marquis has a median complaint mileage of 86925 miles. The most common issue is EXTERIOR LIGHTING."

"What are common problems with the 2003 Mercury Grand Marquis?"

"The most frequently reported component in NHTSA complaints for the 2003 Mercury Grand Marquis is EXTERIOR LIGHTING, accounting for a significant portion of the 447 total complaints filed."

2003 Mercury Grand Marquis: Reliability Data

Source: NHTSA — 447 complaints

447

Total Complaints

86,925mi

Median Mileage

EXTERIOR LIGHTING

Top Issue

Crash Reports

When Do Complaints Happen?

Distribution of NHTSA complaints by vehicle mileage at time of report.

50,829 25th Percentile

86,925 Median Mileage

120,000 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

EXTERIOR LIGHTING

187

ELECTRICAL SYSTEM

STEERING

EXTERIOR LIGHTING:HEADLIGHTS

VEHICLE SPEED CONTROL

SUSPENSION

SUSPENSION:REAR

AIR BAGS

ENGINE AND ENGINE COOLING:ENGINE

POWER TRAIN

Severity Assessment

Crashes

Fires

Injuries

Deaths

Sample Complaint Reports

"DASHBOARD CONTROL PANEL IS TOTAL DARKNESS RADIO, CD, CLOCK, POOR ILLUMINATION. DEALER HAS BEEN NOTIFIED. PLEASE PROVIDE FURTHER INFORMATION. MR"

"WHILE THE VEHICLE IS IDLING THERE IS A ROUGHNESS AND KNOCKING NOISE. PLEASE FURNISH ADDITIONAL INFORMATION DEALER IS AWARE OF THE PROBLEM. MR"

"VEHICLE AIR BAG SENOR LIGHT COMES ON AND STAYS ON. THE DEALERSHIP HAS SERVICED VEHICLE 5 TIMES, BUT IS UNABLE TO CORRECT THE PROBLEM. PH"

Source: NHTSA ODI Complaints Database. Names and identifying details omitted.

Data source: View this vehicle on NHTSA.gov | NHTSA ODI Complaints Database. Public domain.

Methodology: Complaint counts and mileage distributions are computed directly from consumer-reported NHTSA complaints. This data represents reported issues, not failure rates — vehicles without complaints are not represented. Full methodology.

Data through: 2026-03-28