2004 Mercury Grand Marquis Exterior Lighting Problems
NHTSA component category: EXTERIOR LIGHTING · data through 07/14/2026
Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.
How exterior lighting ranks on this vehicle
Share of the 347 complaints citing each category; one complaint can cite several. Full breakdown on the 2004 Mercury Grand Marquis overview page.
What owners report
“LIGHTS WENT OUT WHILE DRIVING DOWN A MAJOR HIGHWAY, ONLY BRIGHTS WOULD WORK, THEN THEY WENT OFF. AFTER CLICKING THEM OFF AND ON THEY CAME…”NHTSA complaint 10453176 — filed 03/27/2012
“BOTH HEADLIGHTS WENT OUT AT NIGHT WITHOUT WARNING, DANGEROUS CONDITION. THE DEALER REPLACED THE LIGHTING CONTROL MODULE WHICH HAD FAILED #4W7Z13C788.”NHTSA complaint 10445649 — filed 01/27/2012
“2004 MERCURY GRAND MARQUIS. CONSUMER WRITES IN REGARDS TO FAILURE OF HEADLIGHTS *TGW THE CONSUMER STATED THE HEADLIGHTS WOULD JUST RANDOMLY GO OUT AND COME…”NHTSA complaint 10440693 — filed 12/15/2011
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Exterior Lighting complaints by year filed
Frequently asked questions
Does the 2004 Mercury Grand Marquis have exterior lighting problems?
Exterior Lighting is the most-reported problem area on the 2004 Mercury Grand Marquis: 185 of 347 complaints on file (53.3%). Complaints are unverified owner reports, not confirmed defects.
How many complaints does the 2004 Mercury Grand Marquis have in total?
347 complaints were on file with NHTSA as of 07/14/2026. Across all categories, 17 involved a crash, 4 involved a fire, 10 reported injuries, and 1 reported deaths.
What does NHTSA's exterior lighting category include?
NHTSA assigns each complaint to standard component categories; this page reports the EXTERIOR LIGHTING category exactly as NHTSA defines and records it.
