Ford Sierra MOT Pass Rate
Overall pass rate across all manufacture years, based on 57,946 real MOT test results. Failure rate: 30.9%.
Data from official DVSA MOT testing records
Ford Sierra MOT Reliability Overview
The Ford Sierra is a moderately popular vehicle in the UK, with 57,946 MOT test results recorded in our database spanning 12 manufacture years. It has an overall MOT pass rate of 69.1% and a failure rate of 30.9%, which is slightly above the UK average of approximately 37%.
Based on this data, the Ford Sierra earns a "Good" reliability rating. The average Ford Sierra presents for MOT with approximately 51,789 miles on the clock. Manufacture year matters: 1986 models achieve the highest pass rate at 81.5%, while 1992 models have the lowest at 61.4%. This 20.1 percentage point difference suggests notable variation in build quality or component durability across production years.
The most common MOT failure for the Ford Sierra is Suspension, affecting 25.8% of all tests. Suspension failures typically involve worn bushes, leaking shock absorbers, broken coil springs, and damaged suspension arms. These affect ride quality, tyre wear, and road holding. The second most common issue is Brakes at 21.1%. Lamps, Reflectors and Electrical Equipment rounds out the top three at 14.7%. Together, these top 3 failure categories account for a significant portion of all MOT failures for this model.
Top failures across all manufacture years combined. Individual year pages may show different top failures.
What Fails Most
Best Year to Buy
Based on MOT data, 1987 models have the highest pass rate at 89.6%.
Based on 2024 MOT test results only — the most recent data available. "Built" = year of manufacture. Cars need their first MOT at 3 years old, so the newest cars shown are from ~3 years ago.
Bar chart showing pass rate by manufacture year from 1987 to 1992
📈 How Each Vintage Ages
Tracking how each manufacture year's MOT pass rate changes as the car ages. Showing 11 vintages — click year chips to highlight.
Multi-line chart showing how different Ford Sierra vintages degrade over time, from age 3 to 41 years.
Only vintages with 100+ tests in at least 3 different test years are shown. Fleet average is the UK-wide pass rate for all cars at each age.
📉 How Age Affects Reliability
MOT failure rate by vehicle age for the Ford Sierra. The dashed red line marks when the manufacturer warranty typically expires (3 years).
Line chart showing MOT failure rate by vehicle age from 16 to 20 years, with warranty expiry marked at 3 years.
💡 What does the warranty cliff mean?
The Ford Sierra shows a relatively stable failure rate after warranty — the change of 0% is negligible. Peak failure occurs at age 17 (50.2% fail rate).
Note: pass rates may improve for very old vehicles due to survivorship bias — only well-maintained cars remain on the road.
* High Fail Rate badge indicates an MOT pass rate below 65% (failure rate above 35%).
What Fails on This Car?
Click a category to see specific failure items.
View as table
| Rank | Failure Category | Rate (%) | Count |
|---|---|---|---|
| 1 | Suspension | 38.8% | 22,510 |
| 2 | Brakes | 30.2% | 17,496 |
| 3 | Lamps, Reflectors And Electrical Equipment | 25.5% | 14,762 |
| 4 | Tyres | 10.9% | 6,342 |
| 5 | Exhaust, Fuel And Emissions | 10.5% | 6,094 |
| 6 | Seat Belts And Supplementary Restraint Systems | 9.2% | 5,359 |
| 7 | Body, Structure And General Items | 8.5% | 4,942 |
| 8 | Steering | 7.6% | 4,430 |
| 9 | Driver's View Of The Road | 7.5% | 4,351 |
| 10 | Body, Chassis, Structure | 3.3% | 1,901 |
| 11 | Noise, Emissions And Leaks | 2.5% | 1,443 |
| 12 | Registration Plates And Vin | 2.1% | 1,191 |
| 13 | Visibility | 1.3% | 777 |
| 14 | Non-component Advisories | 1.1% | 666 |
Failures per 10,000 Miles
avg. 51,789 miFor every 10,000 miles driven, this shows what percentage of MOT tests fail for each category. This accounts for how far cars are actually driven, not just raw pass/fail counts.
View as table
| Category | Rate / 10K mi | Raw % | Count |
|---|---|---|---|
| Suspension | 7.50 | 38.8% | 22,510 |
| Brakes | 5.83 | 30.2% | 17,496 |
| Lamps & Electrical | 4.92 | 25.5% | 14,762 |
| Body & Structure | 2.28 | 11.8% | 6,843 |
| Tyres | 2.11 | 10.9% | 6,342 |
| Emissions & Exhaust | 2.03 | 10.5% | 6,094 |
| Seat Belts | 1.79 | 9.2% | 5,359 |
| Visibility | 1.71 | 8.8% | 5,128 |
| Steering | 1.48 | 7.6% | 4,430 |
| Noise, emissions and leaks | 0.48 | 2.5% | 1,443 |
| Registration Plates and VIN | 0.40 | 2.1% | 1,191 |
| Non-component advisories | 0.22 | 1.1% | 666 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Ford Sierra has 51,789 miles when tested for MOT.
📊 Mileage-Adjusted Failure Rate
How often this car fails MOT relative to how much it's driven — a fairer comparison than raw pass rate.
The Ford Sierra has a mileage-adjusted failure rate of 5.97% per 10,000 miles driven. The average across all makes is 5.38%, so this model is worse than average.
About Ford Sierra MOT Data
The Ford Sierra is a moderately popular vehicle in the UK, with 57,946 MOT test results recorded in our database spanning 12 manufacture years. It has an overall MOT pass rate of 69.1% and a failure rate of 30.9%, which is slightly above the UK average of approximately 37%.
For Ford Sierra owners, these results suggest a reliable vehicle that generally passes its MOT without major issues. Focus your pre-MOT checks on suspension and brakes for the best chance of a first-time pass. Use our detailed year-by-year breakdown and failure analysis below to understand how your specific Sierra is likely to perform.
Suspension — 25.8% of failures
Suspension issues account for 25.8% of MOT failures on the Ford Sierra. Suspension failures typically involve worn bushes, leaking shock absorbers, broken coil springs, and damaged suspension arms. These affect ride quality, tyre wear, and road holding. Typical repair costs: £200–500. Pre-MOT check: Look for uneven tyre wear, listen for clunking over bumps, and check if the car pulls to one side. A bouncy ride suggests worn shock absorbers. Visually inspect coil springs for cracks.
Brakes — 21.1% of failures
Brakes issues account for 21.1% of MOT failures on the Ford Sierra. Brake-related failures include worn brake pads, corroded brake discs, leaking brake lines, and faulty brake servos. These are safety-critical components — any brake deficiency will result in an MOT fail. Typical repair costs: £150–400. Pre-MOT check: Listen for squealing or grinding noises. Check brake pedal feel — if it feels spongy or goes to the floor, have the system inspected immediately. Look at brake pad thickness through the wheel spokes (minimum 3mm).
Lamps, Reflectors and Electrical Equipment — 14.7% of failures
Lamps, Reflectors and Electrical Equipment issues account for 14.7% of MOT failures on the Ford Sierra. Lighting failures cover all external lights: headlights, tail lights, brake lights, indicators, fog lights, and reflectors. A single blown bulb will cause an MOT fail. This is one of the most preventable failure categories. Typical repair costs: £5–50. Pre-MOT check: Walk around the car and check every light — headlights (dipped and main beam), side lights, tail lights, brake lights, indicators, hazard lights, reverse light, rear fog light, and number plate lights. Replace any blown bulbs before the test.
Frequently Asked Questions
What is the MOT pass rate for the Ford Sierra?
Based on 57,946 MOT tests in our database, the Ford Sierra has an overall pass rate of 69.1% (30.9% fail rate).
What are the most common MOT failures on a Ford Sierra?
The top 3 reasons a Ford Sierra fails its MOT are: 1. Suspension (25.8%), 2. Brakes (21.1%), 3. Lamps, Reflectors and Electrical Equipment (14.7%). Check these areas before booking your MOT.
Is the Ford Sierra reliable?
With a 30.9% MOT failure rate, the Sierra is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Ford Sierra?
Based on failure data, focus on: Suspension (25.8%); Brakes (21.1%); Lamps, Reflectors and Electrical Equipment (14.7%). These are the areas most likely to cause a fail. Also check all lights, tyres (minimum 1.6mm tread), and windscreen condition — these are quick wins that apply to all cars.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.