Jaguar 420g MOT Pass Rate
Overall pass rate across all manufacture years, based on 226 real MOT test results. Failure rate: 15.9%.
Data from official DVSA MOT testing records
Jaguar 420g MOT Reliability Overview
The Jaguar 420g is a rare vehicle in the UK, with 226 MOT test results recorded in our database spanning 3 manufacture years. It has an overall MOT pass rate of 84.1% and a failure rate of 15.9%, which is well above the UK average of approximately 37%.
Based on this data, the Jaguar 420g earns a "Excellent" reliability rating. The average Jaguar 420g presents for MOT with approximately 57,913 miles on the clock. Manufacture year matters: 1970 models achieve the highest pass rate at 93.9%, while 1968 models have the lowest at 80.2%. This 13.7 percentage point difference suggests notable variation in build quality or component durability across production years.
The most common MOT failure for the Jaguar 420g is Suspension, affecting 24.3% 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 11.1%. Steering rounds out the top three at 10.2%. 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
Pass Rate by Manufacture Year
* 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 | 31.0% | 70 |
| 2 | Steering | 15.5% | 35 |
| 3 | Lamps, Reflectors And Electrical Equipment | 14.1% | 32 |
| 4 | Brakes | 11.9% | 27 |
| 5 | Tyres | 6.6% | 15 |
| 6 | Driver's View Of The Road | 4.4% | 10 |
| 7 | Exhaust, Fuel And Emissions | 3.1% | 7 |
| 8 | Body, Chassis, Structure | 2.2% | 5 |
| 9 | Body, Structure And General Items | 1.8% | 4 |
| 10 | Visibility | 1.8% | 4 |
| 11 | Noise, Emissions And Leaks | 1.3% | 3 |
| 12 | Non-component Advisories | 0.4% | 1 |
| 13 | Items Not Tested | 0.4% | 1 |
Failures per 10,000 Miles
avg. 57,913 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 | 5.35 | 31.0% | 70 |
| Steering | 2.67 | 15.5% | 35 |
| Lamps & Electrical | 2.44 | 14.1% | 32 |
| Brakes | 2.06 | 11.9% | 27 |
| Tyres | 1.15 | 6.6% | 15 |
| Visibility | 1.07 | 6.2% | 14 |
| Body & Structure | 0.69 | 4.0% | 9 |
| Emissions & Exhaust | 0.53 | 3.1% | 7 |
| Noise, emissions and leaks | 0.23 | 1.3% | 3 |
| Non-component advisories | 0.08 | 0.4% | 1 |
| Items Not Tested | 0.08 | 0.4% | 1 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Jaguar 420g has 57,913 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 Jaguar 420g has a mileage-adjusted failure rate of 2.75% per 10,000 miles driven. The average across all makes is 5.38%, so this model is better than average.
About Jaguar 420g MOT Data
The Jaguar 420g is a rare vehicle in the UK, with 226 MOT test results recorded in our database spanning 3 manufacture years. It has an overall MOT pass rate of 84.1% and a failure rate of 15.9%, which is well above the UK average of approximately 37%.
For Jaguar 420g 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 420g is likely to perform.
Suspension — 24.3% of failures
Suspension issues account for 24.3% of MOT failures on the Jaguar 420g. 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 — 11.1% of failures
Brakes issues account for 11.1% of MOT failures on the Jaguar 420g. 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).
Steering — 10.2% of failures
Steering issues account for 10.2% of MOT failures on the Jaguar 420g. Steering failures include excessive play in the steering wheel, leaking power steering fluid, worn track rod ends, and damaged steering rack. These affect vehicle control and are closely related to suspension wear. Typical repair costs: £150–600. Pre-MOT check: Check for excessive steering wheel play (more than a few inches of free movement). Listen for whining from the power steering pump. Look for fluid leaks under the car near the front wheels.
Frequently Asked Questions
What is the MOT pass rate for the Jaguar 420g?
Based on 226 MOT tests in our database, the Jaguar 420g has an overall pass rate of 84.1% (15.9% fail rate).
What are the most common MOT failures on a Jaguar 420g?
The top 3 reasons a Jaguar 420g fails its MOT are: 1. Suspension (24.3%), 2. Brakes (11.1%), 3. Steering (10.2%). Check these areas before booking your MOT.
Is the Jaguar 420g reliable?
With a 15.9% MOT failure rate, the 420g is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Jaguar 420g?
Based on failure data, focus on: Suspension (24.3%); Brakes (11.1%); Steering (10.2%). 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.