Ford Mustang Reliability

Best and worst years

Ranked by complaints per production run rather than by raw count. A raw count only tells you which year sold well — the best-selling year always looks like the worst car. Dividing by the number of runs removes sales volume and leaves the fault rate.

Recent years are marked «too new» and left out of the ranking on purpose. Complaints accumulate for a decade after a car is sold, so a 2026 build will always look flawless next to a ten-year-old one. Comparing them would be dishonest. Among the 35 years with enough history, 2005 is the one to avoid and 1987 the one to look for.

When it starts to break

Not the calendar year the complaint was filed — the age of the car when it failed. This is the number that decides whether a fault costs you anything: inside the warranty the manufacturer pays, outside it you do.

Basic warranty on this car is 3 years / 36,000 miles. Only 29.8% of reported failures happen inside it — the remaining 70.2% come out of the owner's pocket. Powertrain cover (5 years / 60,000 miles) reaches further, but it only covers engine and transmission, and most complaints here are not either.

What actually fails

Systems by number of complaints, with the age at which each typically goes. The age column is the useful one — it tells you what to expect next on a car you already own, and what to inspect on one you are about to buy.

What else in this class

Same vehicle class, so the comparison is fair — an estate against an estate, not against a coupé.

How we measure it

Reliability scores usually arrive as a number out of five with no working shown. We publish the arithmetic instead, because two things about it are arguable and you should be able to argue with them.

Rate, not total. A model that sold three million units collects more complaints than one that sold thirty thousand, and that says nothing about either. So we divide by the number of production runs — the distinct first-eleven-character VIN prefixes on record. Across 1,100,006 complaints and 295,326 runs the market average works out at 3.72 per run.

Age, not year. Every complaint carries an incident date and a model year, so we can work out how old the car was when it failed. That is what the warranty question turns on, and it is why our «worst year» rankings exclude anything built in the last 6 years — those cars simply have not had time to break yet.

What this is not. A complaint to NHTSA is a deliberate act, so this measures serious faults, not paint that scratched. It says nothing about running costs or how nice a car is to own. And an absence of complaints on a rare model means an absence of owners, not excellence.