"How reliable is the 2005 Mercury Grand Marquis?"

"Based on 633 NHTSA complaints, the 2005 Mercury Grand Marquis has a median complaint mileage of 70000 miles. The most common issue is EXTERIOR LIGHTING."

"What are common problems with the 2005 Mercury Grand Marquis?"

"The most frequently reported component in NHTSA complaints for the 2005 Mercury Grand Marquis is EXTERIOR LIGHTING, accounting for a significant portion of the 633 total complaints filed."

2005 Mercury Grand Marquis: Reliability Data

Source: NHTSA — 633 complaints

633

Total Complaints

70,000mi

Median Mileage

EXTERIOR LIGHTING

Top Issue

Crash Reports

When Do Complaints Happen?

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

43,165 25th Percentile

70,000 Median Mileage

98,000 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

EXTERIOR LIGHTING

260

ELECTRICAL SYSTEM

AIR BAGS

EXTERIOR LIGHTING:HEADLIGHTS

SEAT BELTS

VEHICLE SPEED CONTROL

STEERING

UNKNOWN OR OTHER

SERVICE BRAKES

STRUCTURE:BODY

Severity Assessment

Crashes

Fires

Injuries

Deaths

Sample Complaint Reports

"WHILE DRIVING 55 MPH VEHICLE RAN OVER A PIECE OF A TIRE TREAD, MEDIUM IN SIZE. THE HIGHWAY PATROL OFFICER INFORMED THE CONSUMER THAT THE VEHICLE WAS LEAKING FUEL ONTO THE ROAD. THE TREAD CAUSED A PUNCTURE IN THE FUEL TANK. VEHICLE WAS TOWED TO THE DEALER.*AK *BF"

"DT: HORN DOES NOT BLOW. NOTICED ALMOST IMMEDIATELY AFTER PURCHASING VEHICLE. DEALER DID NOT KNOW HOW TO FIX, SAID ALL MODELS HAD THIS PROBLEM. *TT CONSUMER STATES THAT AFTER CONTACTING NHTSA AND FORD 3 DAYS LATER, CONSUMER RECEIVED A CALL TO BRING THE CAR IN FOR REPAIRS AND IT ONLY TOOK A HALF H..."

"HORN ON 2005 MERCURY GRAND ARQUIS WORKS INTERMITTENTLY"

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