What year Ford Sierra LX is most reliable?

Based on MOT first-test pass rates, the 1988 Ford Sierra LX has the highest pass rate at 100.0%, out of 9,651 vehicles tested.

What are the most common Ford Sierra LX MOT failures?

The most common Ford Sierra LX MOT failures vary by year. Check the individual year pages for detailed defect breakdowns — links in the table above.

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Ford Sierra LX — Reliability by Year

109,380 vehicles · MOT data 1986–1993 · first-test pass rates

This page shows MOT first-test pass rates for each year the Ford Sierra LX was manufactured — click any year to explore that cohort in detail. Trying to decide which year to buy? See the full buying guide →

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Best pass rate year

1988

100.0% pass rate · 9,651 vehicles

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Lowest pass rate year

1990

66.7% pass rate · 31,732 vehicles

Year	Pass rate	Avg mileage	Vehicles
1993	—	—	710
1992	80.8%	66,452 mi	13,302
1991	66.8%	33,288 mi	22,231
1990	66.7%	34,338 mi	31,732
1989	76.7%	28,853 mi	12,711
1988	100.0%	90,272 mi	9,651
1987	87.5%	54,712 mi	9,848
1986	—	—	9,195

Which year Ford Sierra LX is most reliable?

MOT pass rate by year of manufacture — averaged across each vehicle's lifetime of tests. Green = noticeably above average for this model; red = noticeably below average.

Tests range from an average of 28,853 miles (newest year) to 90,272 miles (oldest year). Older years naturally accumulate more tests at higher mileages — see the mileage-normalised breakdown →

Trying to decide which year to buy?

We've done the full analysis — which years to look for, which to avoid, and where to find the best value for reliability on a Ford Sierra LX.

See the buying guide →

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Check any UK registration — free MOT history and risk insights.