2006 Mercedes Gl420 Cdi 4-matic A MOT Pass Rate
Pass rate for Gl420 Cdi 4-matic A models manufactured in 2006, based on 210 real MOT test results.
Data from official DVSA MOT testing records
This page shows all Gl420 Cdi 4-matic A cars tested in 2006. Want to see how cars built in 2006 hold up over time?
View 2006 Mercedes Gl420 Cdi 4-matic A vintage page → (76.7% current pass rate)2006 Mercedes Gl420 Cdi 4-matic A MOT Analysis
The 2006 Mercedes Gl420 Cdi 4-matic A has an MOT pass rate of 81.9% based on 210 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 75,804 miles on the odometer. With a 18.1% failure rate, the 2006 Gl420 Cdi 4-matic A is rated as "Excellent" for MOT reliability.
The leading cause of MOT failure for the 2006 Mercedes Gl420 Cdi 4-matic A is Lamps, Reflectors and Electrical Equipment, responsible for 3.3% of failures. Lighting failures cover all external lights: headlights, tail lights, brake lights, indicators, fog lights, and reflectors. A single blown bulb will cause an MOT fail. This is one of the most preventable failure categories. Typical repair costs range from £5–50. Brakes is the second most common issue at 1.0%. Non-component advisories follows at 0.5%.
Top failures specific to 2006 models only. The overall Gl420 Cdi 4-matic A page may show different rankings.
What Fails Most
What Fails on This Car?
Click a category to see specific failure items.
View as table
| Rank | Failure Category | Rate (%) | Count |
|---|---|---|---|
| 1 | Lamps, Reflectors And Electrical Equipment | 3.3% | 7 |
| 2 | Brakes | 1.0% | 2 |
| 3 | Non-component Advisories | 0.5% | 1 |
| 4 | Seat Belts And Supplementary Restraint Systems | 0.5% | 1 |
| 5 | Suspension | 0.5% | 1 |
Failures per 10,000 Miles
avg. 75,804 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 |
|---|---|---|---|
| Lamps & Electrical | 0.44 | 3.3% | 7 |
| Brakes | 0.13 | 1.0% | 2 |
| Non-component advisories | 0.06 | 0.5% | 1 |
| Seat Belts | 0.06 | 0.5% | 1 |
| Suspension | 0.06 | 0.5% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 2006 Mercedes Gl420 Cdi 4-matic A has an MOT pass rate of 81.9% based on 210 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 75,804 miles on the odometer. With a 18.1% failure rate, the 2006 Gl420 Cdi 4-matic A is rated as "Excellent" for MOT reliability.
If you own or are considering buying a 2006 Mercedes Gl420 Cdi 4-matic A, you can expect reliable MOT performance overall. Before your MOT, pay particular attention to lamps, reflectors and electrical equipment: Walk around the car and check every light — headlights (dipped and main beam), side lights, tail lights, brake lights, indicators, hazard lights, reverse light, rear fog light, and number plate lights. Replace any blown bulbs before the test. At 75,804 average miles, these vehicles are in the mid-range where component wear starts to become a factor.
Lamps, Reflectors and Electrical Equipment — 3.3% of failures
Lamps, Reflectors and Electrical Equipment issues account for 3.3% of MOT failures on 2006 Mercedes Gl420 Cdi 4-matic A models. Lighting failures cover all external lights: headlights, tail lights, brake lights, indicators, fog lights, and reflectors. A single blown bulb will cause an MOT fail. This is one of the most preventable failure categories. Typical repair costs: £5–50. Pre-MOT check: Walk around the car and check every light — headlights (dipped and main beam), side lights, tail lights, brake lights, indicators, hazard lights, reverse light, rear fog light, and number plate lights. Replace any blown bulbs before the test.
Brakes — 1.0% of failures
Brakes issues account for 1.0% of MOT failures on 2006 Mercedes Gl420 Cdi 4-matic A models. Brake-related failures include worn brake pads, corroded brake discs, leaking brake lines, and faulty brake servos. These are safety-critical components — any brake deficiency will result in an MOT fail. Typical repair costs: £150–400. Pre-MOT check: Listen for squealing or grinding noises. Check brake pedal feel — if it feels spongy or goes to the floor, have the system inspected immediately. Look at brake pad thickness through the wheel spokes (minimum 3mm).
Non-component advisories — 0.5% of failures
Non-component advisories issues account for 0.5% of MOT failures on 2006 Mercedes Gl420 Cdi 4-matic A models. Non-component advisories 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.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.