1999 Jeep Wrangler — MOT failures & pass rate
655 MOT tests on the 1999 Jeep Wrangler are in this dataset, and 73.7% of them passed. Against large SUVs of a similar age (24.6% fail rate), the 1999 Wrangler comes out 1.6pp worse. Failures cluster in lighting & signalling, brakes and suspension.
What the MOT record shows
One area stands out: lighting & signalling, recorded in 18.5% of tests against 11.6% for the next-worst category.
At component level the recurring items are position lamp, catalyst emissions and headlamp aim — position lamp alone was recorded 42 times.
Condition tracks the odometer closely. Failures run at 18.6% in the 30-60k band and 29.3% in the 120-150k band, a 10.7-point spread.
Suspension is the most common advisory, noted on 32.8% of tests — work that passed today but is likely due soon.
The trend is worsening — 23.0% of tests failed in 2021 against 29.0% in 2025, the usual pattern as a fleet ages.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 18.5% | 121 |
| 2 | Brakes | 11.6% | 76 |
| 3 | Suspension | 10.4% | 68 |
| 4 | Emissions & environmental | 5.3% | 35 |
| 5 | Visibility | 5.0% | 33 |
| 6 | Body, structure & corrosion | 4.6% | 30 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Position lamp | 42 |
| 2 | Catalyst emissions | 41 |
| 3 | Headlamp aim | 40 |
| 4 | Rigid brake pipes | 31 |
| 5 | Service brake imbalance | 27 |
| 6 | Service brake performance | 26 |
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 | 32.8% | 215 |
| 2 | Brakes | 24.6% | 161 |
| 3 | Body, structure & corrosion | 10.7% | 70 |
| 4 | Lighting & signalling | 9.2% | 60 |
| 5 | Steering | 9.0% | 59 |
| 6 | Other defects | 9.0% | 59 |
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 | 102 | 18.6% |
| 60-90k | 262 | 24.1% |
| 90-120k | 189 | 31.2% |
| 120-150k | 58 | 29.3% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 126 | 23.0% |
| 2022 | 136 | 25.0% |
| 2023 | 129 | 25.6% |
| 2024 | 133 | 28.6% |
| 2025 | 131 | 29.0% |
What to check before buying a 1999 Wrangler
The failure pattern for this year is specific enough to inspect against: lighting & signalling accounted for 18.5% of tests. Start there.
- Lighting & signalling (18.5% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (11.6% 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.
- Suspension (10.4% 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 1999 Jeep Wranglers pass their MOT?
73.7% of the 655 1999 Jeep Wrangler MOT tests in this dataset passed — a 26.3% fail rate.
What is the most common MOT failure on a 1999 Jeep Wrangler?
Lighting & signalling, recorded in 18.5% of tests, followed by brakes (11.6%).
Does the 1999 Wrangler get worse with mileage?
Its MOT fail rate rises from 18.6% in the 30-60k band to 29.3% in the 120-150k band.
Methodology & source. Based on 655 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.