AA Vehicle Inspections has revealed that most faults they find on used diesel cars relate to the engine, which could result in costly repairs.
The service, which carries out pre-sale inspections for used car dealers, founds that 96% of faults found on diesel cars are to do with the engine – compared to just 64% on petrol cars.
Perhaps unsurprisingly, electric and hybrid cars were more likely to reveal electrical issues.
Alarmingly, vans are the most likely to have hidden faults, with 40% of AA vehicle inspectors saying that vans they inspected on the forecourt had the most problems.
AA Vehicle Inspections director, David Bruce, said: “A high number of our inspectors found more faults on vans at dealers than any other vehicle type. Identifying faults and providing feedback before vehicles are sold to customers helps dealers to improve their stock.”
The revelation comes after news that half of all vans fail their first MOT.
More than half of the inspectors surveyed revealed that a quarter of the vehicles they inspected had illegal or unsafe tyres.