What year Ford Sierra Gl is most reliable?

Based on MOT first-test pass rates, the 1988 Ford Sierra Gl has the highest pass rate at 100.0%, out of 17,243 vehicles tested.

What are the most common Ford Sierra Gl MOT failures?

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

CarHunch

Get Started

Ford Sierra Gl — Reliability by Year

161,679 vehicles · MOT data 1982–1990 · first-test pass rates

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

✓

Best pass rate year

1988

100.0% pass rate · 17,243 vehicles

⚠

Lowest pass rate year

1990

40.0% pass rate · 3,861 vehicles

Year	Pass rate	Avg mileage	Vehicles
1990	40.0%	78,504 mi	3,861
1989	—	—	18,577
1988	100.0%	29,301 mi	17,243
1987	72.2%	68,424 mi	17,020
1986	90.0%	92,731 mi	14,766
1985	—	—	16,869
1984	—	—	24,806
1983	100.0%	51,614 mi	45,630
1982	—	—	2,907

Which year Ford Sierra Gl 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 29,301 miles (newest year) to 92,731 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 Gl.

See the buying guide →

← All Ford models

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