The ongoing problems with the system for testing cars in Northern Ireland are due to be raised at the Assembly this week.
Testing at MOT test centres were suspended last week following concerns over lift equipment, affecting tens of thousands of customers. Cracks were found in 48 out of 55 lifts.
A leading DUP MLA is expected to question if there was an adequate replacement programme in place for car lifts at the centres.
Infrastructure committee member Keith Buchanan wants to see the procurement details from the last process in 2010-2011.
He is concerned about the number of cycles a lift can do rather than the life span.
Each MOT lane checks up to 90 cars per day for around 320 days a year, this is almost 30,000 cars or lift cycles a year for at least eight years.
Mr Buchanan said it is important to find out if that figure is covered by the manufacturer. He also wants to know what the Department of Infrastructure's plans are.
He suspects it could be autumn before all the lifts are replaced at the earliest, as it takes three months to deliver a lift and none have been ordered.
Meanwhile at National Car Testing centres in the Republic, inspections are being carried out on all lifts as a precautionary measure.
This means operator, Applus, could also be looking for new lifts if their current inspections show they need replacements.
Mr Buchanan is concerned that with no lifts currently ordered in Northern Ireland, high demand from other countries - and potentially south of the border - could cause a backlog and delay supply further.
