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One-fifth of drivers are at risk of this MOT failure, according to the specialists at the RAC.
They have previously warned that lighting and signalling issues account for 18.9% of DVSA test failures.
Suspension issues, brake faults, and tyre problems account for 13 per cent, 10 per cent, and 7.7 per cent, respectively.
Experts at the RAC have urged road users to conduct a series of tests at home before setting off for a garage.
RAC Drive explained: “Nearly a fifth of all cars which fail their MOT do so because of an issue with their lights. Often, this will be as simple as a blown bulb. Switch all your lights on and walk around your car to check they’re in working order.
“Do the indicators flash as they should? Do the sidelights and fog lights function as they should?
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