What year MG Montego Efi MG is most reliable?

Based on MOT first-test pass rates, the 1984 MG Montego Efi MG has the highest pass rate at 95.0%, out of 2,376 vehicles tested.

What are the most common MG Montego Efi MG MOT failures?

The most common MG Montego Efi MG MOT failures vary by year. Check the individual year pages for detailed defect breakdowns — links in the table above.

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MG Montego Efi MG — Reliability by Year

26,969 vehicles · MOT data 1984–1990 · first-test pass rates

This page shows MOT first-test pass rates for each year the MG Montego Efi MG 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

1984

95.0% pass rate · 2,376 vehicles

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Lowest pass rate year

1987

59.2% pass rate · 4,054 vehicles

Year	Pass rate	Avg mileage	Vehicles
1990	75.0%	139,940 mi	219
1989	63.3%	94,094 mi	4,582
1988	61.6%	91,541 mi	5,866
1987	59.2%	78,375 mi	4,054
1986	64.5%	99,762 mi	4,617
1985	65.6%	92,869 mi	5,255
1984	95.0%	43,634 mi	2,376

Which year MG Montego Efi MG 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 43,634 miles (newest year) to 139,940 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 MG Montego Efi MG.

See the buying guide →

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