2021 Isuzu D-Max Dl40 Auto — MOT failures & pass rate
Across 878 MOT tests analysed for the 2021 Isuzu D-Max Dl40 Auto, the most common recorded failure areas were lighting & signalling, tyres and brakes. Its pass rate of 89.5% was below the average for cars of a similar age (91.2%). Higher-mileage examples failed more often — 17.0% in the 90-120k group versus 9.1% in the 0-30k group.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 4.9% | 43 |
| 2 | Tyres | 3.5% | 31 |
| 3 | Brakes | 3.1% | 27 |
| 4 | Suspension | 2.1% | 18 |
| 5 | Visibility | 1.1% | 10 |
| 6 | Seat belts & restraints | 1.0% | 9 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Headlamp aim | 34 |
| 2 | Shock absorbers | 23 |
| 3 | Tread depth | 17 |
| 4 | Brake pads | 12 |
| 5 | Malfunction indicator lamp | 8 |
| 6 | Pedal | 8 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Tyres | 19.5% | 171 |
| 2 | Brakes | 12.9% | 113 |
| 3 | Other defects | 6.8% | 60 |
| 4 | Lighting & signalling | 3.5% | 31 |
| 5 | Suspension | 3.1% | 27 |
| 6 | Visibility | 2.7% | 24 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 0-30k | 252 | 9.1% |
| 30-60k | 402 | 10.0% |
| 60-90k | 161 | 10.6% |
| 90-120k | 53 | 17.0% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2024 | 430 | 11.2% |
| 2025 | 445 | 9.7% |
What to check before buying a 2021 D-Max Dl40 Auto
Before buying a 2021 Isuzu D-Max Dl40 Auto, focus on the areas it most often fails on. Lighting & signalling accounted for 4.9% of tests for this year.
- Lighting & signalling (4.9% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Tyres (3.5% of tests): Usually a quick, known-cost fix, but check tread, age and uneven wear (which can hint at alignment or suspension issues). Typical repair: £50–£120 per tyre.
- Brakes (3.1% of tests): Pads/discs are routine wear; binding, imbalance or corroded pipes are more serious — test for pulling under braking. Typical repair: £100–£350 per axle.
Repair costs are rough UK ballpark ranges to set expectations, not quotes — actual prices vary widely by car, parts and garage.
Frequently asked questions
How many 2021 Isuzu D-Max Dl40 Autos pass their MOT?
89.5% of the 878 2021 Isuzu D-Max Dl40 Auto MOT tests in this dataset passed — a 10.5% fail rate.
What is the most common MOT failure on a 2021 Isuzu D-Max Dl40 Auto?
Lighting & signalling, recorded in 4.9% of tests, followed by tyres (3.5%).
Does the 2021 D-Max Dl40 Auto get worse with mileage?
Its MOT fail rate rises from 9.1% in the 0-30k band to 17.0% in the 90-120k band.
Methodology & source. Based on 878 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-01. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.