Hundreds of data quality issues with the clean car discount scheme have now been resolved, officials say.
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The used car industry has complained that wrong or missing data is leading to some customers getting the wrong rebates or fees since the scheme began three months ago.
The Transport Agency said it resolved 619 out of the 697 queries about data quality it had received by the end of April.
It fixed 95 used vehicles eligible for the scheme which did not have emissions data, and found and fixed four wider data quality trends by the end of April, according to a Transport Ministry Official Information Act response quoting NZTA.
At one point it could not print a key form but fixed that on 22 April, and was tracking and fixing where the wrong details of vehicles were being loaded into the Motor Vehicle Register.
It was "continuing to improve its in-house systems and processes to reduce errors and improve data quality".
Leading into the scheme, Waka Kotahi "advised that there could be some data quality issues associated with some vehicle attributes (largely for used vehicles)", the ministry said.
Updating historical vehicle model records with more accurate emissions figures was "largely complete", and the transport rule that kicked in in April now required importers to provide more complete information about CO2 emissions.
Over time, the way vehicles were tested for emissions in Japan and the UK would increasingly align with the test New Zealand recognised.