MERCURY COUGAR vs TOYOTA SIENNA

The MERCURY COUGAR (1973–2002, 24 model years) carries 2,645 NHTSA consumer complaints and 11 safety recalls, while the TOYOTA SIENNA (1996–2020, 25 model years) carries 10,768 complaints and 147 recalls. Severity indicators for the pair split as follows: 173 vs 556 crashes, 94 vs 116 fires, and 6 vs 11 reported fatalities.

Raw complaint counts favor whichever nameplate has fewer vehicles on the road, so the cleaner lens is components: which specific part families concentrate each model's filings? For the MERCURY COUGAR, the leading complaint category is engine and engine cooling:engine (211 filings), followed by vehicle speed control and power train:automatic transmission. For the TOYOTA SIENNA, it is structure:body (1123), ahead of structure:body:door and air bags. When the two vehicles cluster around the same component, the problem is likely a shared supplier or a shared federal standard under stress; when they diverge, each nameplate has its own defect signature independent of the other.

Average NCAP crash-test scores are not uniformly available for both nameplates in this dataset, which typically means one or both pre-date the 2011 rating methodology refresh. Use the side-by-side table below as your scorecard, but do not treat it as a verdict. Recall counts tell you how many defects the manufacturer has already been compelled to remedy; complaint counts tell you what owners are still flagging today; and safety ratings tell you how the vehicle performs in standardized barrier tests — three different lenses on the same underlying question. The "also compare" links at the bottom of this page let you triangulate against neighboring nameplates in each model's competitive set.