1991 Ford Sierra: MOT pass rate and reliability

87.1% of 1991 Ford Sierras pass the MOT first time, measured across 263 DVSA tests on that model year alone. The average one had covered 52,217 miles.

How the 1991 compares

• Against all Ford Sierras (88.5%, 2,297 tests): -1.4 points
• Against all 1991 cars (75.1%): +12 points
• National first-time pass rate, all cars and years: 77%

Every Ford Sierra model year

Pass rates fall as cars age, so the only fair comparison for a 1991 car is other cars of the same age. The full run for the Ford Sierra:

What this means if you are buying a 1991 Sierra

The 1991 sits close to the Ford Sierra average, so there is no strong model-year signal either way. Judge the individual car on its own history. Check the exact car with the free MOT history checker before you buy, and run its VIN and mileage through our free VIN decoder and clocking check.

What a 35-year-old car fails on

A 1991 car is 35 years old now, and age drives the failure mix more than the badge does. Across all cars tested, these are the categories that actually cause failures:

• Lights and electrical: 10.36% of all cars tested
• Suspension: 8.65% of all cars tested
• Tyres: 6.23% of all cars tested
• Brakes: 6.1% of all cars tested
• Visibility: wipers, washers, glass: 4.65% of all cars tested
• Body, chassis and structure: 3.18% of all cars tested

That is around average, so condition and service history will tell you more than the odometer does. On a 1991 Ford Sierra the average at test was 52,217 miles, so treat anything far above that as a car that has worked harder than its peers, and anything far below as one worth checking for the faults that come from standing still.

The strongest year for this model is 1990 at 88.5%, and the weakest in our data is 1992 at 83.3%. That 5.2 point spread across the model's life is why comparing a 1991 car against a newer one tells you very little.

Nearby model years

• 1990 Ford Sierra - 88.5%
• 1992 Ford Sierra - 83.3%

All Ford Sierra MOT data · Every model