A surprising trend is emerging in vehicle inspections: electric vehicles (EVs) are experiencing higher failure rates on their first mandatory technical inspection, known as the MOT test in the UK, than their internal combustion engine (ICE) counterparts. While often touted as mechanically simpler and requiring less maintenance, data suggests a different reality, raising questions about the long-term reliability and potential hidden costs of EV ownership.
Recent statistics from the Driver and Vehicle Standards Agency (DVSA) in Great Britain reveal that battery electric vehicles account for half of the ten models with the worst first-time MOT pass rates. This finding challenges the common perception of EVs as inherently low-maintenance machines, prompting scrutiny of manufacturer claims and the potential for unforeseen issues.
Premium Brands at the Bottom
Perhaps the most striking revelation is the poor performance of the Mercedes-Benz EQC. This premium electric SUV, positioned in the luxury segment, exhibited a first-time failure rate exceeding 17% in the past year. Analysis indicates that a significant proportion of these vehicles failed inspection within three years of registration. This suggests that even high-end EVs are not immune to the issues leading to MOT failures.
Tesla models also feature prominently among the least reliable vehicles during their first technical inspection. The popular Model Y and Model 3 recorded failure rates approaching 15%, placing them among the vehicles most likely to fail the test. BMW i4 and the Citroën E-C4 electric crossover also registered concerning results.
The Root Cause Isn’t the Battery
Experts emphasize that the failures aren’t attributable to the batteries or electric motors themselves. Instead, the primary culprit appears to be a more fundamental physical factor: tire wear. EVs demonstrate a 40% higher rate of excessive tire wear compared to vehicles with traditional combustion engines.
This accelerated wear is a direct consequence of the combination of the substantial weight of EV batteries and the instantaneous torque delivery characteristic of electric motors. The ability to apply significant power to the road from a standstill puts considerable stress on tires, leading to faster degradation and an increased likelihood of failing to meet the legal tread depth requirement of 1.6 millimeters.
The issue isn’t necessarily a flaw in the EVs themselves, but rather a consequence of the physics involved. Owners may not be aware of the increased rate of tire wear and may delay replacement, leading to failure during inspection.
Potential Changes to Vehicle Inspections
Recognizing the unique challenges presented by EVs, discussions are underway in the European Union and other countries regarding potential revisions to technical inspection regulations. Current methodologies were developed for vehicles powered by gasoline and diesel and may not adequately address the specific characteristics of electric vehicles.
Proposed changes could involve a greater focus on software functionality, the performance of advanced driver-assistance systems (ADAS), and the safety features of the electric powertrain. The goal is to adapt the inspection process to reflect the evolving nature of automotive technology. The increasing complexity of modern vehicles, with their reliance on software and electronic systems, necessitates a more comprehensive and nuanced approach to vehicle safety checks.
Preparation is Key to Passing
When selecting a vehicle, considering its reliability and the experiences of other drivers is crucial. MOT failure rates can serve as an objective indicator of potential issues. While certain EV models have shown higher failure rates, this doesn’t necessarily disqualify them from consideration.
However, EV owners must be aware of the specific factors that can contribute to MOT failures, such as accelerated tire wear. Diligent maintenance and preparation remain essential to avoid unexpected issues during inspection. A proactive approach to vehicle maintenance, including regular tire checks and timely replacements, can significantly reduce the risk of failure.
while EVs offer numerous benefits, including reduced emissions and lower running costs, potential buyers should be aware of the potential for higher MOT failure rates and the importance of proper maintenance. Source
