Mercury Mariner: which model years draw the most owner complaints?
1,296 complaints filed with NHTSA about the Mercury Mariner, model years 2005 to 2011. 3 model years stand out for the engine or transmission: 2008 (transmission 6×); 2009 (engine 6×, transmission 4×); 2010 (engine 6.3×, transmission 5.5×). Quietest mature years by complaint count: 2007, 2006, 2005. Counts of unverified owner reports, compared only with other years of the same model; not failure rates.
Complaints by model year
| MODEL YEAR | COMPLAINTS | VS OTHER YEARS | STANDS OUT | RECALLS |
|---|---|---|---|---|
| 2005 MarinerFEW REPORTS | 67 | quiet: 3 of 7 | 3 | |
| 2006 MarinerFEW REPORTS | 63 | quiet: 2 of 7 | 4 | |
| 2007 MarinerFEW REPORTS | 33 | quiet: 1 of 7 | 3 | |
| 2008 Mariner | 461 | transmission 6× | 4 | |
| 2009 Mariner | 315 | engine 6×, transmission 4× | 2 | |
| 2010 Mariner | 270 | engine 6.3×, transmission 5.5× | 3 | |
| 2011 MarinerFEW REPORTS | 87 | — | 3 |
"Stands out" = 40 or more complaints naming that system and at least twice the model's quiet (lower-quartile) year, or twice the share seen across every vehicle of that model year. Newer years have had less time on the road. "Quiet" ranks only years with 7+ years on the road and 20+ complaints. NHTSA data through November 2026.
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Other Mercury models
Mercury Cougar · Mercury Grand Marquis · Mercury Mariner Hybrid · Mercury Milan · Mercury Montego · Mercury Monterey · Mercury Mountaineer · Mercury Sable. All makes and models.
Source: NHTSA public complaints, recalls, service bulletin and investigation databases, data received through November 2026. Complaints are unverified reports from owners, not failure rates: sales volumes are unknown, so a model year is only compared with other years of the same model. Not a diagnosis and not financial advice. PulsCar is not affiliated with NHTSA. Year pages: 200820092010