The Driver and Vehicle Agency (DVA) has announced that all MOT tests for cars and light vehicles have been suspended.
They said that any customers with relevant scheduled appointments for Tuesday should not attend.
Paul Duffy, Chief Executive of the DVA, said on Monday night that "following further inspections of lift faults in MOT centres, the contractor has not provided sufficient assurance to DVA this evening on the effectiveness of the ongoing repairs".
The DVA said that tests on heavy goods vehicles and buses will continue.
Mr Duffy said that "all customers, except customers with four year old vehicles and taxis, will be automatically issued an MOT exemption certificate and therefore can continue to drive."
He added: "For customers with four year old vehicles and taxis, we are working to urgently find a solution to get these vehicles through MOT and will contact customers directly.
"The DVA will issue a further statement as a matter of urgency to advise these customers and those who have MOTs booked for later this week. We want to advise customers that more cancellations are very likely.
"The DVA recognises the considerable inconvenience and disruption this will cause for many people and sincerely apologises that it has been unable to rectify this situation more quickly.
"Given the urgency of this situation, we are asking the public to follow media, social media channels and nidirect for updates. Staff will also be kept fully informed by their centre managers.
"The Minister has held an urgent meeting with officials this evening in relation to this matter."
