"How reliable is the 1991 Mercury Grand Marquis?"

"Based on 104 NHTSA complaints, the 1991 Mercury Grand Marquis has a median complaint mileage of 0 miles. The most common issue is ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR."

"What are common problems with the 1991 Mercury Grand Marquis?"

"The most frequently reported component in NHTSA complaints for the 1991 Mercury Grand Marquis is ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR, accounting for a significant portion of the 104 total complaints filed."

1991 Mercury Grand Marquis: Reliability Data

Source: NHTSA — 104 complaints

104

Total Complaints

ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR

Top Issue

Crash Reports

What Fails?

Most reported component issues from NHTSA complaints.

ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR

VEHICLE SPEED CONTROL

POWER TRAIN:AUTOMATIC TRANSMISSION

AIR BAGS

SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC:ROTOR

ENGINE AND ENGINE COOLING:ENGINE:GASOLINE

ELECTRICAL SYSTEM:WIRING

ELECTRICAL SYSTEM:IGNITION

VEHICLE SPEED CONTROL:CABLES

ENGINE AND ENGINE COOLING:ENGINE

Severity Assessment

Crashes

Fires

Injuries

Deaths

Sample Complaint Reports

"TINT ON TOP OF WINSHIELD BLURS VISION. TT"

"ELECTRICAL SYSTEM MALFUNCTION, POWER WINDOWS AND DOORS NOT FUNCTIONING. TT"

"AUTOMATIC TRANSMISSION FAILURE. TT"

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