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AutoRank's latest top-defects feed shows the most common MOT fails are often the sort of things you can see before the test. This guide walks through the biggest repeat offenders, from windscreen damage and weak lamps to tyre tread, handbrake efficiency, engine warning lights and broken springs. It also explains why left and right side faults show up separately in MOT records, then turns the data into a simple pre-test check you can do at home. If you have ten minutes, a clean cloth and a quick walk round the car, you can often spot the easy failures before they cost you a retest.