Top 10 cars that fail their first MoT Comparison site TootCompare.com has compiled a list of the cars with the best and worst pass rates for their first MoT, using data supplied by the Vehicle Operator and Services Agency (VOSA). Cars require their first MoT three years after they are registered; this list is based on cars that were registered in 2010 and tested in 2013. TootCompare ignored models for which there were less than 1,000 tests during the year. Half of the cars most likely to fail their first MoT are MPVs. Click through our gallery to see the full list. The top 10 cars that are most likely to pass their MoT test.