Should I check the MOT history before buying a 1988 Ford Sierra Gls I?

Yes. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. A full MOT history analysis will highlight patterns that a single test result won't reveal.

What corrosion should I look for when inspecting a 1988 Ford Sierra Gls I?

Check brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that is expensive to fix and can fail an MOT.

How are tyres and brakes typically on a 1988 Ford Sierra Gls I?

Tyres and brakes are the most common advisory items on vehicles of this age. Budget for replacement if they are near the limit, and factor this into your offer price.

Do I need an HPI check when buying a 1988 Ford Sierra Gls I?

Yes. The MOT history will not show outstanding finance, insurance write-offs, or stolen status. An HPI check covers these areas and should be part of any used car purchase.

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Ford Sierra Gls I (1988)

7,361 real MOT outcomes analysed • 0.1% first-time pass rate

1988 Ford Sierra Gls I

CarHunch analysed 7,361 real MOT records for the 1988 Ford Sierra Gls I. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.

This 1988 Ford Sierra GLS I is essentially unreliable by modern standards, with a first-time pass rate of just 10% against the UK average of 80%—meaning nine out of ten examples fail their MOT on first attempt. No petrol variants in this dataset passed first time, and the median CarHunch reliability score sits at 50, placing it in the bottom half of vehicles on test.

At nearly 56,000 miles on average, these cars are now 36 years old and genuinely past their safe operational life; the zero dangerous defects recorded here likely reflects that most problem vehicles have already been scrapped rather than any inherent strength. If you're considering one, treat it as a hobby project rather than daily transport, and budget heavily for immediate welding, suspension, and brake work before it will pass an MOT.

Below average reliability 79.9% below UK average

0.1%

pass MOT first time

UK average: ~80%

ever had a dangerous defect

recorded at any MOT

avg MOT failures per car

over 1 tests on record

What to check before buying a 1988 Ford Sierra Gls I

Practical pre-purchase checks for this age and model.

📋 Check the full MOT history. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. Enter the reg below for a full AI analysis.
🔍 Inspect for corrosion in person. Brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that's expensive to fix and can fail an MOT.
🛞 Check tyres and brakes. The most common advisory items at this age. Budget for replacement if they're near the limit — factor this into your offer price.
📄 Run an HPI check. The MOT history won't show outstanding finance, insurance write-offs, or stolen status — an HPI check will.

Before you buy a Ford Sierra Gls I

MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.

Inspection

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Pass Rate by Fuel Type

Fuel type	Vehicles	Pass rate	Avg failures
Petrol (100%)	7,353	0%	0
Other (0%)	6	77.1%	1.67
Diesel (0%)	2	0%	0

MOT History Averages

Avg MOT tests per vehicle

Avg failures per vehicle

Avg advisories per vehicle

Found a specific Ford Sierra Gls I?

Enter the reg to see its individual MOT history, AI Hunches, and how it compares to this cohort.

Other model years — Ford Sierra Gls I:

1987 1989 1990 1991 1992 1993