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A faulty TPMS sensor can now lead to an immediate MOT testing failure. As of 1st January 2015, any car manufactured from 2012 onwards that displays a TPMS warning light on the dashboard due to a system malfunction will automatically fail its MOT test. This new regulation emphasizes the importance of regular tyre services and effective vehicle diagnostics to ensure compliance.

There are 2 types of TPMS systems fitted on cars today. Direct systems use radio sensors mounted inside each wheel to measure tyre pressures – they ‘directly’ measure the pressure within each tyre and send the data to a control unit. In contrast, indirect systems utilize the vehicle’s existing ABS sensors to measure and compare the rotational speeds of the tyres and vibrations to ‘indirectly’ calculate the pressure within the tyres. Both types of system work with the vehicle’s ECU to alert the driver via dashboard warning lights to any pressure loss or variance issues. Regular MOT testing and tyre services can help ensure these systems function properly, contributing to overall vehicle diagnostics and safety.