The Retail Motor Industry Federation (RMIF) has advised MOT testers to ensure that they follow the new requirements of the computerised system.
According to the RMIF, failing to follow the test in the correct order can result in disciplinary action being taken against the testing centre.
Among the new facilities available to testers is the pass after rectification at the station (PRS), which was included when the MOT computer was introduced to testing centres.
Explaining the system, Stephen Coles, head of the RMIF's MOT team, explained that PRS allows testers to highlight that a vehicle has successfully passed its MOT after a minor fault has been corrected.
"It is possible to use PRS, pass the vehicle, and then perform the repair afterwards before returning the vehicle to the customer, but the strict rules of the MOT do not allow for this," he warned.
Consequently, some testers may be using the PRS system incorrectly and passing a vehicle before a repair has been made, he added.
The Vehicle and Operator Services Agency computerised the MOT scheme to provide more accurate information for testing stations, as well as enabling garages to pass on data electronically.
