Photo: Stephen Craven / Geograph Britain and Ireland, Wikimedia Commons, CC BY-SA 2.0.
Electrified cars show a wide spread in UK MOT results
Electrified cars do not form a single reliability group, according to an analysis of more than 2.3 million UK MOT tests attributed to temporary car insurance provider Tempcover. The difference between the strongest and weakest models in the published comparison was about 25 percentage points. That is a useful warning against treating every electric or hybrid car as mechanically identical, but it is not proof that battery-electric cars are always more reliable than petrol cars.
The UK MOT is a roadworthiness inspection. It checks items such as tyres, brakes, steering, suspension, lamps, seatbelts, body structure and, where relevant, emissions-related equipment. It does not provide a complete health report for a traction battery, charging system, infotainment unit, air-conditioning compressor or gearbox. An MOT pass rate is therefore a measure of observed test outcomes, not a full ownership-cost or breakdown statistic.
What the analysis actually covers
The figures reported from the Tempcover research concern electrified vehicles in a broad sense. That category includes hybrids as well as fully electric cars. The distinction matters because one of the best-performing examples cited in the research is the Honda Jazz Crosstar, a hybrid rather than a battery-electric model.
The public summaries also do not make every adjustment visible. Vehicle age, mileage, sample size, use in fleets and the number of tests available for each model can all affect a pass rate. A young electric model may reach its first MOT with less accumulated wear than an older petrol car. An early electric model that has been used heavily may appear in a very different part of the reliability curve.
The Driver and Vehicle Standards Agency publishes the underlying MOT statistics for Great Britain. Its data includes test outcomes and defect categories. It does not describe the pass rate as a universal reliability score, because the inspection only covers defined roadworthiness and environmental items.
Honda Jazz Crosstar leads the cited comparison
The Tempcover analysis gave the Honda Jazz Crosstar a first-time pass rate of 97.2 per cent. The result belongs to a hybrid vehicle, so it should not be presented as a direct score for a pure EV. It does show that electrification alone does not determine the outcome: vehicle design, age, maintenance and the way the car is used remain important.
Reports on the study also put Jaguar and Porsche above 93 per cent across their electrified ranges. Tesla was reported at an average of 86.5 per cent, while Renault recorded 83.3 per cent. These are results from the research sample, not official DVSA ratings and not a promise that every car from those manufacturers will pass its next inspection.
Brand-level comparisons can hide important differences. A manufacturer may have a small number of models, a relatively young fleet or cars that are more likely to be serviced by a dealer. Another may have a large population of older vehicles used for high-mileage commuting. Without the age and mileage distribution, a single average should not be used to rank every vehicle on sale.
Renault Zoe records the weakest figure cited
The Renault Zoe was listed with a 71.4 per cent pass rate in the same analysis. The Zoe was one of the early volume EVs in the UK, meaning that its MOT population includes many older cars. Age and accumulated mileage provide an important context: suspension wear, tyre condition, brake corrosion and lighting faults become more likely as a vehicle gets older, regardless of its powertrain.
The figure does not identify a single cause of failure for every Zoe. It also does not tell a used-car buyer whether a particular car has a healthy battery. A model average can be a useful screening tool, but the individual vehicle’s service records, mileage, accident history and battery condition carry more weight when making a purchase decision.
What an electric car’s MOT checks
An electric car has no tailpipe and does not undergo the same emissions test as a petrol or diesel car. It still shares many roadworthiness components with conventional vehicles. Tyres, brakes, lamps, suspension, steering, windscreen condition, seatbelts, bodywork and warning indicators can all affect the result.
Tyres deserve particular attention. Battery packs can make an EV heavier than a comparable combustion car, while an electric motor can deliver its torque immediately. Those characteristics do not guarantee faster wear, because tyre choice and driving style also matter, but they make pressures, tread depth, alignment and sidewall condition important checks before an inspection.
Regenerative braking changes the way the friction brakes are used. Pads and discs may see less normal braking, but a brake that is rarely used can be vulnerable to corrosion in some conditions. Suspension arms, bushes, joints and wheel bearings remain mechanical parts. The absence of an engine and exhaust does not remove those failure points.
MOT data is not the same as total reliability
A car can pass its MOT and still have an expensive charging fault, a degraded battery, a failed heat pump, an infotainment problem or an issue with its drive unit. A petrol car can also pass while developing a clutch, turbocharger, timing-chain or transmission fault shortly afterwards. The test is not designed to forecast every breakdown.
This distinction also prevents the headline number from being overstated. If an EV has fewer emissions-related components to fail, that can help its MOT result. If it is heavy and its tyres or suspension are worn, those areas can work against it. The final pass rate reflects the balance of the items examined, plus the age and maintenance history of the cars presented for testing.
What the result means outside Britain
The findings are directly relevant to cars tested in Great Britain. They cannot be transferred without qualification to Romania, Italy, Spain, France, Germany or another market. Inspection rules, road surfaces, climate, vehicle age and driving patterns differ. A British MOT pass rate is therefore background evidence rather than a local reliability guarantee.
The practical lesson travels better than the percentage. A used EV should be checked for tyre wear, suspension play, brake corrosion, lighting faults, body damage, service history and battery health. A hybrid needs the same roadworthiness checks, plus a review of its combustion and high-voltage systems. A specialist inspection is more informative than a national average when the buyer is considering one specific car.
The measured conclusion
The Tempcover figures show a wide spread between electrified models, with the Honda Jazz Crosstar at 97.2 per cent and the Renault Zoe at 71.4 per cent in the cited comparison. They do not show that every EV is more reliable than every petrol car, nor that the lowest-ranked model is necessarily a bad purchase.
The reliable conclusion is narrower: model choice, age, mileage and maintenance affect MOT outcomes, even within the electrified market. MOT data is valuable for the components it tests, but it should be combined with service records, an independent mechanical inspection and a battery-health assessment before buying a used car.
