Allianz Cornhill and Norwich Union (NU) are visiting brokers in a last ditch attempt to achieve 95% compliance with the motor insurance database (MID).
From October insurers that do not ensure that 95% of all driver data is delivered to database within 14 days face fines of up to £250,000.
Allianz Cornhill is understood to have one of the best performing compliance rates at 93%, while NU's performance is believed to be 91%.
NU is thought to be targeting brokers who submit data on a 'manual' basis, such as via letters and faxes, rather than through EDI.
One broker, who did not want to be named, said the insurer had plans to visit more than 100 of its broker partners.
NU broker compliance manager Graham Condie confirmed it had been in contact with brokers.
He said: "The MID is a top priority. We are proactively managing the message with all our brokers to enhance the effectiveness of our processes."
Condie denied that NU had targeted certain brokers. "Problems manifest themselves in many ways," he said.
"Manual systems do not represent the bulk of the problems.
"Having said that we are all driven by process in technology and we always are looking for ways to improve."
A spokeswoman for Allianz Cornhill said the company had been speaking to brokers "to see what we can do to make sure that the relevant data is in place".