What are the common problems with the 1986 Mercury Grand Marquis?
Owners of the 1986 Mercury Grand Marquis have filed 21 complaints with NHTSA, most often about the electrical system (11) and engine cooling (4). In NHTSA's complaints file of November 11, 2026, none of its 21 complaints lists a mileage, too few to say when problems were reported; a complaint is an owner's report, not a proven defect.
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See what the paid report includes →NHTSA's file holds 21 owner complaints on the 1986 Mercury Grand Marquis. Owners named the electrical system most often: 11 complaints. A complaint can name more than one component. Of the 21 complaints, none reports a crash, 11 report a fire and none reports an injury. These are owners' reports to NHTSA, not findings.
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Common problems with the 1986 Grand Marquis
NHTSA's file holds 21 owner complaints on the 1986 Mercury Grand Marquis. Owners named the electrical system most often: 11 complaints. A complaint can name more than one component.
| Component (NHTSA category) | Complaints | Listing mileage | Median mileage |
|---|---|---|---|
| Electrical System | 11 | 0 | Under 5 mileages |
| Engine And Engine Cooling | 4 | 0 | Under 5 mileages |
| Service Brakes, Hydraulic | 2 | 0 | Under 5 mileages |
| Power Train | 1 | 0 | Under 5 mileages |
| Steering | 1 | 0 | Under 5 mileages |
Of the 21 complaints, none reports a crash, 11 report a fire and none reports an injury. These are owners' reports to NHTSA, not findings.
Mileage when owners reported a problem with the 1986 Grand Marquis
Too few complaints on the 1986 Grand Marquis list a mileage to say when owners reported problems: none of its 21 complaints lists a mileage, and a median is given here only with 10 or more.
These mileages say when owners reported a problem, not when a 1986 Grand Marquis wears out. NHTSA's file holds only vehicles whose owners complained; one that ran without a problem never appears in it, so it gives no lifespan and no cutoff, and how a vehicle was maintained matters more than any one odometer reading.
Every model year together: Half of the 1,911 NHTSA owner complaints on the Mercury Grand Marquis that list mileage came after 76,000 miles (NHTSA complaints file of November 11, 2026). How many miles will a Mercury Grand Marquis last? →
Is the 1986 Grand Marquis a good year?
Complaint counts cannot say whether the 1986 is a good or a bad Grand Marquis: they rise with how many were sold and how long they have been on the road. They show how the 1986 compares with the other model years in NHTSA's file.
With 21 complaints, the 1986 ranks 25th of the 27 Mercury Grand Marquis model years from 1984 to 2010 with 10 or more complaints, counting from the most, tied with 1985. The most: the 2005 (488). The fewest: the 1984 (15).
Recent model years have had less time to collect complaints, so their counts are still growing. No year is ranked by mileage here, because a year's median mileage mostly follows its age.
| Model year | Owner complaints | Listing mileage | Median mileage |
|---|---|---|---|
| 1984 Grand Marquis | 15 | 0 | Under 10 mileages |
| 1985 Grand Marquis | 21 | 1 | Under 10 mileages |
| 1986 (this page) | 21 | 0 | Under 10 mileages |
| 1987 Grand Marquis | 43 | 3 | Under 10 mileages |
| 1988 Grand Marquis | 73 | 2 | Under 10 mileages |
| 1989 Grand Marquis | 58 | 4 | Under 10 mileages |
| 1990 Grand Marquis | 55 | 5 | Under 10 mileages |
| 1991 Grand Marquis | 82 | 2 | Under 10 mileages |
| 1992 Grand Marquis | 255 | 15 | 114,000 |
| 1993 Grand Marquis | 144 | 15 | 90,000 |
| 1994 Grand Marquis | 156 | 23 | 99,000 |
| 1995 Grand Marquis | 179 | 38 | 88,000 |
| 1996 Grand Marquis | 239 | 91 | 84,263 |
| 1997 Grand Marquis | 316 | 124 | 80,072 |
| 1998 Grand Marquis | 143 | 40 | 83,400 |
| 1999 Grand Marquis | 164 | 61 | 103,000 |
| 2000 Grand Marquis | 162 | 89 | 73,825 |
| 2001 Grand Marquis | 157 | 86 | 70,000 |
| 2002 Grand Marquis | 78 | 48 | 50,000 |
| 2003 Grand Marquis | 362 | 289 | 85,194 |
| 2004 Grand Marquis | 348 | 281 | 82,000 |
| 2005 Grand Marquis | 488 | 396 | 72,800 |
| 2006 Grand Marquis | 143 | 117 | 63,706 |
| 2007 Grand Marquis | 96 | 77 | 29,430 |
| 2008 Grand Marquis | 80 | 66 | 45,659 |
| 2009 Grand Marquis | 26 | 19 | 33,000 |
| 2010 Grand Marquis | 25 | 19 | 36,000 |
1986 Mercury Grand Marquis recalls
NHTSA's recall files of November 11, 2026 list 2 recall campaigns that name the 1986 Mercury Grand Marquis (1 vehicle campaign and 1 equipment or tire campaign that names this model year, often for aftermarket parts). A campaign covers a production range, not every vehicle of the model year: check the VIN with NHTSA's free recall lookup.
What these figures can and cannot tell you
- Complaints are owners’ reports to NHTSA. NHTSA publishes them without verifying them: a complaint is an allegation, not a defect finding.
- The mileage is what the owner wrote on the complaint; NHTSA does not check it against the odometer.
- The make, model and model year are the ones on the complaint. NHTSA records them as filed, so a few complaints sit under a model year the name was not sold in.
- They are not a lifespan study. The file holds only vehicles whose owners reported a problem, so these figures do not say how long a typical 1986 Grand Marquis lasts.
- A complaint count rises with how many vehicles were sold and how long they have been on the road, so it is not a rating of the 1986 Grand Marquis.
- Nothing here describes one vehicle: its title brands, odometer readings, accidents and open recalls are in the records for its own VIN.
- None of the 21 complaints on the 1986 Mercury Grand Marquis gives a usable mileage (blank, zero, a filler such as 999999, or over 500,000).
- NHTSA name counted: GRAND MARQUIS. NHTSA files some vehicles under several names (a series name and a trim name, for example); this page counts only this one.
- Recall-file name matched: GRAND MARQUIS.
Primary sources behind this page
Open the underlying public source and verify that its scope matches the question you are asking.
- NHTSA complaints flat file (FLAT_CMPL.zip), downloaded November 11, 2026National Highway Traffic Safety Administration
- Complaints file field layout (CMPL.txt)National Highway Traffic Safety Administration
- NHTSA recalls flat file (FLAT_RCL_PRE_2010.zip), downloaded November 11, 2026National Highway Traffic Safety Administration
- NHTSA recalls flat file (FLAT_RCL_POST_2010.zip), downloaded November 11, 2026National Highway Traffic Safety Administration
- Recalls file field layout (RCL.txt)National Highway Traffic Safety Administration
- NHTSA recall and complaint datasets: scope and documentationNational Highway Traffic Safety Administration
- Recalls Lookup by VINNational Highway Traffic Safety Administration
NHTSA’s complaints file was downloaded on November 11, 2026 (FLAT_CMPL.txt, dated 2026-11-11 10:15, 2,265,416 rows), with its recall files (FLAT_RCL_PRE_2010.txt and FLAT_RCL_POST_2010.txt, dated 2026-11-11 08:02). Each complaint is counted once, by its NHTSA number, with the model year and mileage of its first row; a model year has a page only with 10 or more complaints. The collection script and its rules are in scripts/collect-nhtsa-model-year-longtail.mjs.
1986 Mercury Grand Marquis questions
What are the most common 1986 Mercury Grand Marquis problems?
NHTSA's file holds 21 owner complaints on the 1986 Mercury Grand Marquis. Owners named the electrical system most often: 11 complaints. A complaint can name more than one component. Of the 21 complaints, none reports a crash, 11 report a fire and none reports an injury. These are owners' reports to NHTSA, not findings.
At what mileage do owners report problems with the 1986 Mercury Grand Marquis?
NHTSA's file gives no mileage figure for the 1986 Mercury Grand Marquis: none of its 21 complaints lists a mileage, and this page gives a median only with 10 or more. These are mileages at a reported problem; they do not say how many miles a 1986 Grand Marquis can cover.
Is the 1986 Mercury Grand Marquis a good year?
Complaint counts cannot say whether the 1986 is a good or a bad Grand Marquis: they rise with how many were sold and how long they have been on the road. They show how the 1986 compares with the other model years in NHTSA's file. With 21 complaints, the 1986 ranks 25th of the 27 Mercury Grand Marquis model years from 1984 to 2010 with 10 or more complaints, counting from the most, tied with 1985. The most: the 2005 (488). The fewest: the 1984 (15).
How many recalls does the 1986 Mercury Grand Marquis have?
NHTSA's recall files of November 11, 2026 list 2 recall campaigns that name the 1986 Mercury Grand Marquis (1 vehicle campaign and 1 equipment or tire campaign that names this model year, often for aftermarket parts). A campaign covers a production range, not every vehicle of the model year: check the VIN with NHTSA's free recall lookup.
How do I check a used 1986 Mercury Grand Marquis before buying?
Take the 17-character VIN from the vehicle and compare the odometer with the readings on file for it: title transfers, inspections and auction sales record the mileage on the day. VIN Lookup (free-vin-lookup.com) sells the original ClearVIN PDF for $14.99 (3 reports for $29.99, 5 for $44.99): odometer readings, title brands and auction records on file for the VIN. Check the VIN before buying a used 1986 Mercury Grand Marquis.