"How reliable is the 2004 Mercury Grand Marquis?"

"Based on 422 NHTSA complaints, the 2004 Mercury Grand Marquis has a median complaint mileage of 82000 miles. The most common issue is EXTERIOR LIGHTING."

"What are common problems with the 2004 Mercury Grand Marquis?"

"The most frequently reported component in NHTSA complaints for the 2004 Mercury Grand Marquis is EXTERIOR LIGHTING, accounting for a significant portion of the 422 total complaints filed."

2004 Mercury Grand Marquis: Reliability Data

Source: NHTSA — 422 complaints

422

Total Complaints

82,000mi

Median Mileage

EXTERIOR LIGHTING

Top Issue

Crash Reports

When Do Complaints Happen?

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

55,125 25th Percentile

82,000 Median Mileage

109,876 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

EXTERIOR LIGHTING

185

STEERING

ELECTRICAL SYSTEM

EXTERIOR LIGHTING:HEADLIGHTS

VEHICLE SPEED CONTROL

INTERIOR LIGHTING

ENGINE AND ENGINE COOLING

AIR BAGS

ENGINE

VISIBILITY/WIPER

Severity Assessment

Crashes

Fires

Injuries

Deaths

Sample Complaint Reports

"THE TURN SIGNAL FAILED INTERMITTENTLY. THE CAUSE HAD NOT BEEN DETERMINED. *JB THE TURN SIGNAL RACED EXTREMELY FAST THAT THE LIGHTS FLICKER INSTEAD OF BLINKING. THE PROBLEM OCCURRED 30 TIMES SINCE DEC. 2003. FORD WAS AWARE OF THE PROBLEM BUT DID NOT HAVE A FIX. *SC"

"WHEN ATTEMPTING TO PRESS THE BRAKE PEDAL, THE DRIVER ALSO PRESSED ON THE ACCELERATOR PEDAL AND CAUSED THE VEHICLE TO ACCELERATE WHICH MADE IT DIFFICULT TO STOP THE VEHICLE. THE CONSUMER STATED THAT THE PEDALS WERE TOO CLOSE TO EACH OTHER. *AK *SC *JB"

"CONSUMER STATED THAT WHILE DRIVING CAME TO A RED LIGHT AND VEHICLE TOOK OFF. THE MORE HE APPLIED THE BRAKES THE FASTER VEHICLE WENT. HE AND HIS WIFE NARROWLY ESCAPED A COLLISION. CONSUMER TOOK FEET OFF THE BRAKES, AND PLACED THE VEHICLE IN NEUTRAL, WHICH CAUSED IT TO SLOW DOWN. THEN, HE CO..."

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