Lighting defects account for over 19 million MOT failures since 2020

New research based on DVSA data reveals that over 3.4 million lighting-related faults are recorded annually, with simple 'not working' bulbs being the most frequent cause of failure

Lighting defects account for over 19 million MOT failures since 2020
Photo: Bigstock

Lighting defects have contributed to more than 19 million MOT failures since 2020, according to our new research based on a Freedom of Information (FOI) request submitted to the Driver and Vehicle Standards Agency (DVSA).

The data reveals that over 3.4 million lighting-related faults are recorded every year. The highest number of defects was recorded in 2021, with 3,515,710 contributing to MOT failures, indicating a small improvement in subsequent years.

The most common defect between 2020 and 2025 was lights “not working,” accounting for 7.2 million recorded instances. Other top faults include “Projected beam image is obviously incorrect” (1,877,732) and “Not working on dipped beam” (1,781,560). These figures highlight a large volume of low-tech issues that drivers could identify themselves.

Ben Welham, our motoring expert, said: “Our research shows that minor lighting faults contribute to millions of MOT failures each year. The good news is that these are usually easy to spot and fix before your MOT, such as replacing a bulb or checking headlight alignment, helping drivers avoid extra costs and stay safe on the road.”

The data also showed that headlights aimed “too low” (1,006,788 defects) are 60% more common as major defects than those aimed “too high,” highlighting a potential hidden safety risk for reduced visibility.

Ben advised drivers to perform simple visual checks: “Walk around your Mercedes with all lights turned on, including indicators, brake lights… high/main and dipped beams, and hazards. In less than a few minutes you can understand whether your car’s lighting works properly or not.” He noted that garages can easily check alignment if a driver is uncertain, adding: “MOT tests are rigorous with lighting checks because they’re so important for safety.”

Source: Cinch

1 Comment

  1. Headlamp aim is a complicated adjustment that needs special equipment to check/adjust beam position. I don’t recommend people attempt to adjust this at home. modern headlamps are sophisticated pieces of equipment with complex lenses and potentially dangerous voltages lurking around the back of the lamp. Most garages will check / adjust for you for a small fee.

    Reply

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