2003 Lexus Gs430 — MOT failures & pass rate
Across 375 MOT tests, the 2003 Lexus Gs430 recorded an 80.5% pass rate. Against all cars of a similar age (27.7% fail rate), the 2003 Gs430 comes out 8.2pp better. Failures cluster in brakes, lighting & signalling and suspension.
What the MOT record shows
No single area dominates — brakes (8.8%) and lighting & signalling (8.8%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are headlamp, catalyst emissions and malfunction indicator lamp — headlamp alone was recorded 23 times.
Mileage matters less than usual here: the 2003 Gs430 fails 13.3% of the time in the 30-60k band and 17.2% at 150k+, a spread of only 3.9 points.
Advisories point at the next bill rather than this one: suspension was flagged on 28.5% of tests without failing them.
The trend is improving — the fail rate fell from 25.3% in 2021 to 13.3% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Brakes | 8.8% | 33 |
| 2 | Lighting & signalling | 8.8% | 33 |
| 3 | Suspension | 8.3% | 31 |
| 4 | Emissions & environmental | 8.3% | 31 |
| 5 | Tyres | 5.3% | 20 |
| 6 | Visibility | 4.5% | 17 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Headlamp | 23 |
| 2 | Catalyst emissions | 20 |
| 3 | Malfunction indicator lamp | 18 |
| 4 | Headlamp aim | 16 |
| 5 | Tread depth | 16 |
| 6 | Wipers | 16 |
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 | 28.5% | 107 |
| 2 | Tyres | 20.0% | 75 |
| 3 | Brakes | 18.9% | 71 |
| 4 | Lighting & signalling | 11.2% | 42 |
| 5 | Body, structure & corrosion | 10.9% | 41 |
| 6 | Other defects | 9.1% | 34 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 30-60k | 30 | 13.3% |
| 60-90k | 85 | 20.0% |
| 90-120k | 111 | 19.8% |
| 120-150k | 91 | 22.0% |
| 150k+ | 58 | 17.2% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 91 | 25.3% |
| 2022 | 92 | 22.8% |
| 2023 | 73 | 15.1% |
| 2024 | 59 | 17.0% |
| 2025 | 60 | 13.3% |
What to check before buying a 2003 Gs430
On a 2003 Gs430, brakes is what the MOT record says goes wrong most — it appeared in 8.8% of tests. Check these areas before you commit.
- Brakes (8.8% 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.
- Lighting & signalling (8.8% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Suspension (8.3% 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 Gs430s pass their MOT?
80.5% of the 375 2003 Lexus Gs430 MOT tests in this dataset passed — a 19.5% fail rate.
What is the most common MOT failure on a 2003 Lexus Gs430?
Brakes, recorded in 8.8% of tests, followed by lighting & signalling (8.8%).
Does the 2003 Gs430 get worse with mileage?
Its MOT fail rate rises from 13.3% in the 30-60k band to 17.2% in the 150k+ band.
Methodology & source. Based on 375 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.