Honda 400n MOT Pass Rate
Overall pass rate across all manufacture years, based on 60 real MOT test results. Failure rate: 23.3%.
Data from official DVSA MOT testing records
Honda 400n MOT Reliability Overview
The Honda 400n is a rare vehicle in the UK, with 60 MOT test results recorded in our database spanning 1 manufacture years. It has an overall MOT pass rate of 76.7% and a failure rate of 23.3%, which is well above the UK average of approximately 37%.
Based on this data, the Honda 400n earns a "Excellent" reliability rating. The average Honda 400n presents for MOT with approximately 43,255 miles on the clock. The 1980 manufacture year performs best with a 86.8% pass rate.
The most common MOT failure for the Honda 400n is Motorcycle fuel and exhaust, affecting 10.0% of all tests. Motorcycle fuel and exhaust issues are a common cause of MOT failure. Regular inspection and maintenance of these components helps ensure your vehicle passes its MOT. The second most common issue is Motorcycle lighting and signalling at 10.0%. Motorcycle steering and suspension rounds out the top three at 8.3%. 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 | Motorcycle Steering And Suspension | 11.7% | 7 |
| 2 | Motorcycle Lighting And Signalling | 10.0% | 6 |
| 3 | Motorcycle Fuel And Exhaust | 10.0% | 6 |
| 4 | Motorcycle Lamps And Reflectors | 5.0% | 3 |
| 5 | Motorcycle Drive System | 3.3% | 2 |
| 6 | Motorcycle Tyres And Wheels | 3.3% | 2 |
| 7 | Motorcycle Body And Structure | 1.7% | 1 |
| 8 | Motorcycle Brakes | 1.7% | 1 |
Failures per 10,000 Miles
avg. 43,255 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 |
|---|---|---|---|
| Motorcycle steering and suspension | 2.70 | 11.7% | 7 |
| Motorcycle lighting and signalling | 2.31 | 10.0% | 6 |
| Motorcycle fuel and exhaust | 2.31 | 10.0% | 6 |
| Motorcycle lamps and reflectors | 1.16 | 5.0% | 3 |
| Motorcycle drive system | 0.77 | 3.3% | 2 |
| Motorcycle tyres and wheels | 0.77 | 3.3% | 2 |
| Motorcycle body and structure | 0.39 | 1.7% | 1 |
| Motorcycle brakes | 0.39 | 1.7% | 1 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Honda 400n has 43,255 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 Honda 400n has a mileage-adjusted failure rate of 5.39% per 10,000 miles driven. The average across all makes is 5.38%, so this model is worse than average.
About Honda 400n MOT Data
The Honda 400n is a rare vehicle in the UK, with 60 MOT test results recorded in our database spanning 1 manufacture years. It has an overall MOT pass rate of 76.7% and a failure rate of 23.3%, which is well above the UK average of approximately 37%.
For Honda 400n owners, these results suggest a reliable vehicle that generally passes its MOT without major issues. Focus your pre-MOT checks on motorcycle fuel and exhaust and motorcycle lighting and signalling 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 400n is likely to perform.
Motorcycle fuel and exhaust — 10.0% of failures
Motorcycle fuel and exhaust issues account for 10.0% of MOT failures on the Honda 400n. Motorcycle fuel and exhaust issues are a common cause of MOT failure. Regular inspection and maintenance of these components helps ensure your vehicle passes its MOT. Typical repair costs: £100–400. Pre-MOT check: Have this system checked during regular servicing. Look for warning signs like unusual noises, vibrations, or dashboard warning lights.
Motorcycle lighting and signalling — 10.0% of failures
Motorcycle lighting and signalling issues account for 10.0% of MOT failures on the Honda 400n. Motorcycle lighting and signalling issues are a common cause of MOT failure. Regular inspection and maintenance of these components helps ensure your vehicle passes its MOT. Typical repair costs: £100–400. Pre-MOT check: Have this system checked during regular servicing. Look for warning signs like unusual noises, vibrations, or dashboard warning lights.
Motorcycle steering and suspension — 8.3% of failures
Motorcycle steering and suspension issues account for 8.3% of MOT failures on the Honda 400n. 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.
Frequently Asked Questions
What is the MOT pass rate for the Honda 400n?
Based on 60 (based on limited data) MOT tests in our database, the Honda 400n has an overall pass rate of 76.7% (23.3% fail rate).
What are the most common MOT failures on a Honda 400n?
The top 3 reasons a Honda 400n fails its MOT are: 1. Motorcycle fuel and exhaust (10.0%), 2. Motorcycle lighting and signalling (10.0%), 3. Motorcycle steering and suspension (8.3%). Check these areas before booking your MOT.
Is the Honda 400n reliable?
With a 23.3% MOT failure rate, the 400n is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Honda 400n?
Based on failure data, focus on: Motorcycle fuel and exhaust (10.0%); Motorcycle lighting and signalling (10.0%); Motorcycle steering and suspension (8.3%). 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.