Statistical data set

MOT class 3 and 4 vehicles: initial failures by defect category

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Financial year Defect category % of tests % of defects
2017 to 2018 Body and structure 1.25% 1.90%
2017 to 2018 Brakes 9.20% 17.20%
2017 to 2018 Driver's view of the road 6.40% 8.70%
2017 to 2018 Driving controls 0.00% 0.00%
2017 to 2018 Fuel and exhaust 3.60% 5.40%
2017 to 2018 Lighting and signalling 17.10% 29.60%
2017 to 2018 Motor tricycles and quadricycles 0.00% 0.00%
2017 to 2018 Reg plates and VIN 0.70% 0.85%
2017 to 2018 Road wheels 0.30% 0.50%
2017 to 2018 Seat belts 1.70% 2.20%
2017 to 2018 Steering 2.40% 3.00%
2017 to 2018 Suspension 12.10% 20.20%
2017 to 2018 Towbars 0.00% 0.00%
2017 to 2018 Tyres 7.10% 10.40%
2017 to 2018 Overall Initial Failure Rate 34.50%
2017 to 2018 Average defects per Initial Test Failure 2.77
2016 to 2017 Body and structure 1.30% 2.00%
2016 to 2017 Brakes 10.00% 17.20%
2016 to 2017 Driver's view of the road 6.80% 8.80%
2016 to 2017 Driving controls 0.00% 0.00%
2016 to 2017 Fuel and exhaust 4.00% 5.60%
2016 to 2017 Lighting and signalling 18.30% 29.70%
2016 to 2017 Motor tricycles and quadricycles 0.00% 0.00%
2016 to 2017 Reg plates and VIN 0.70% 0.90%
2016 to 2017 Road wheels 0.40% 0.50%
2016 to 2017 Seat belts 1.90% 2.30%
2016 to 2017 Steering 2.60% 3.10%
2016 to 2017 Suspension 12.20% 19.40%
2016 to 2017 Towbars 0.00% 0.00%
2016 to 2017 Tyres 7.40% 10.50%
2016 to 2017 Overall Initial Failure Rate 35.40%
2016 to 2017 Average defects per Initial Test Failure 2.85
2015 to 2016 Body and structure 1.30% 2.00%
2015 to 2016 Brakes 9.70% 16.90%
2015 to 2016 Driver's view of the road 6.70% 9.00%
2015 to 2016 Driving controls 0.00% 0.00%
2015 to 2016 Fuel and exhaust 4.00% 5.60%
2015 to 2016 Lighting and signalling 17.90% 29.60%
2015 to 2016 Motor tricycles and quadricycles 0.00% 0.00%
2015 to 2016 Reg plates and VIN 0.70% 0.80%
2015 to 2016 Road wheels 0.30% 0.50%
2015 to 2016 Seat belts 1.90% 2.40%
2015 to 2016 Steering 2.70% 3.20%
2015 to 2016 Suspension 12.20% 19.70%
2015 to 2016 Towbars 0.00% 0.00%
2015 to 2016 Tyres 7.10% 10.10%
2015 to 2016 Overall Initial Failure Rate 36.80%
2015 to 2016 Average defects per Initial Test Failure 2.92
2014 to 2015 Body and structure 1.40% 2.00%
2014 to 2015 Brakes 9.60% 17.20%
2014 to 2015 Driver's view of the road 6.60% 8.50%
2014 to 2015 Driving controls 0.00% 0.00%
2014 to 2015 Fuel and exhaust 4.30% 5.80%
2014 to 2015 Lighting and signalling 18.40% 30.00%
2014 to 2015 Motor tricycles and quadricycles 0.00% 0.00%
2014 to 2015 Reg plates and VIN 0.80% 0.90%
2014 to 2015 Road wheels 0.30% 0.50%
2014 to 2015 Seat belts 2.20% 2.60%
2014 to 2015 Steering 2.90% 3.40%
2014 to 2015 Suspension 12.00% 18.70%
2014 to 2015 Towbars 0.00% 0.00%
2014 to 2015 Tyres 7.40% 10.00%
2014 to 2015 Overall Initial Failure Rate 38.30%
2014 to 2015 Average defects per Initial Test Failure 2.99
2013 to 2014 Body and structure 1.50% 1.90%
2013 to 2014 Brakes 10.40% 17.40%
2013 to 2014 Driver's view of the road 7.10% 8.70%
2013 to 2014 Driving controls 0.00% 0.00%
2013 to 2014 Fuel and exhaust 4.60% 5.90%
2013 to 2014 Lighting and signalling 19.10% 29.10%
2013 to 2014 Motor tricycles and quadricycles 0.00% 0.00%
2013 to 2014 Reg plates and VIN 0.80% 0.90%
2013 to 2014 Road wheels 0.40% 0.40%
2013 to 2014 Seat belts 2.60% 2.90%
2013 to 2014 Steering 3.30% 3.60%
2013 to 2014 Suspension 12.80% 18.70%
2013 to 2014 Towbars 0.00% 0.00%
2013 to 2014 Tyres 7.80% 9.90%
2013 to 2014 Overall Initial Failure Rate 40.00% -
2013 to 2014 Average defects per Initial Test Failure - 3.08