2003 Lexus Sc430 — MOT failures & pass rate
The 2003 Lexus Sc430 passed 82.5% of its 1,704 recorded MOT tests. That is 10.1 percentage points better than all cars of a similar age, which fail at 27.6%. Failures cluster in emissions & environmental, lighting & signalling and suspension.
What the MOT record shows
No single area dominates — emissions & environmental (6.4%) and lighting & signalling (6.2%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are catalyst emissions, malfunction indicator lamp and headlamp aim — catalyst emissions alone was recorded 72 times.
A 150k+ example is materially riskier than a 0-30k one: 22.8% versus 10.4%.
Advisories point at the next bill rather than this one: suspension was flagged on 21.7% of tests without failing them.
The trend is worsening — 17.6% of tests failed in 2021 against 20.0% in 2025, the usual pattern as a fleet ages.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Emissions & environmental | 6.4% | 109 |
| 2 | Lighting & signalling | 6.2% | 105 |
| 3 | Suspension | 6.0% | 103 |
| 4 | Brakes | 5.9% | 101 |
| 5 | Tyres | 4.2% | 72 |
| 6 | Visibility | 2.6% | 44 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Catalyst emissions | 72 |
| 2 | Malfunction indicator lamp | 58 |
| 3 | Headlamp aim | 57 |
| 4 | Position lamp | 52 |
| 5 | Ball joint | 49 |
| 6 | Service brake performance | 35 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Suspension | 21.7% | 370 |
| 2 | Tyres | 19.6% | 334 |
| 3 | Brakes | 15.6% | 266 |
| 4 | Body, structure & corrosion | 10.6% | 181 |
| 5 | Emissions & environmental | 5.2% | 89 |
| 6 | Other defects | 4.2% | 71 |
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 | 48 | 10.4% |
| 30-60k | 240 | 9.6% |
| 60-90k | 502 | 15.3% |
| 90-120k | 454 | 17.8% |
| 120-150k | 308 | 25.7% |
| 150k+ | 149 | 22.8% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 358 | 17.6% |
| 2022 | 345 | 17.1% |
| 2023 | 348 | 16.1% |
| 2024 | 318 | 17.0% |
| 2025 | 335 | 20.0% |
What to check before buying a 2003 Sc430
On a 2003 Sc430, emissions & environmental is what the MOT record says goes wrong most — it appeared in 6.4% of tests. Check these areas before you commit.
- Emissions & environmental (6.4% of tests): More common on older diesels (DPF/EGR) — can be expensive; check for warning lights and smoke. Typical repair: £100–£600.
- Lighting & signalling (6.2% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Suspension (6.0% of tests): Worn drop links, bushes, springs or shocks — listen for knocks over bumps and check for uneven tyre wear. Typical repair: £150–£450 per corner.
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 2003 Lexus Sc430s pass their MOT?
82.5% of the 1,704 2003 Lexus Sc430 MOT tests in this dataset passed — a 17.5% fail rate.
What is the most common MOT failure on a 2003 Lexus Sc430?
Emissions & environmental, recorded in 6.4% of tests, followed by lighting & signalling (6.2%).
Does the 2003 Sc430 get worse with mileage?
Its MOT fail rate rises from 10.4% in the 0-30k band to 22.8% in the 150k+ band.
Methodology & source. Based on 1,704 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-27. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.