The contact owns a 2008 Mercury Grand Marquis. The contact stated that the wiring harness for the brake pedal sensor was faulty, causing the exterior brake lights to fail to illuminate. The failure almost caused a collision. The dealer was made aware of the failure and informed the contact to bring the vehicle in to be diagnosed. The vehicle was not diagnosed nor repaired by an independent…
2008 Mercury Grand Marquis lighting problems
moderate 3 complaints filed with NHTSA · avg repair $250 · see lighting across all vehicles →
Complaints
3
Recalls
0
Avg fix
$250
When does it fail?
Of the 3 lighting complaints filed for the 2008 Mercury Grand Marquis, here's the actual mileage breakdown — failures cluster heaviest at 75,000-100,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Of the 4 model years of Mercury Grand Marquis we track for lighting problems, this one has the fewest owner complaints on file (3).
No new NHTSA lighting complaint has been filed on this vehicle in over 4 years — the issue may be aging out of the active population.
What owners are reporting 1 most recent
Had lighting trouble with your 2008 Mercury Grand Marquis?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the lighting problem on the 2008 Mercury Grand Marquis?
It's a documented issue but not catastrophic. 3 complaints have been filed. Repairs average $250 and most owners catch it before it causes a breakdown.
At what mileage does the lighting typically fail?
Based on the 3 complaints filed, lighting issues most often appear around 76,000 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $250 for lighting repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to lighting?
No active recalls currently cover lighting issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2008/Mercury/Grand Marquis.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.