The New South Wales Opposition says it wants a full audit of the lobbying firm First State, after its head breached the Government's code of conduct for lobbyists.

An investigation has found that Joseph Tannous made misleading statements when he boasted online that his role within the Liberal Party meant he could achieve the desired results for clients.

Christopher Eccles found the statement breached a section of the code of conduct for lobbyists, but decided not to de-register the firm.

Under NSW rules, lobbyists must keep their activities strictly separate to any personal involvement in a political party and they are banned from making misleading or exaggerated claims about their access to governments.

The Opposition's Luke Foley is not happy with the result of the investigation.

He says at the very least, all of Mr Tannous's interactions with the Government should now be examined.

"He's been boasting about his high office in the Liberal Party enabling him to deliver results to his clients," he said.

"We need the Director General of the Department of Premier and Cabinet to examine if there's truth to those boasts."

Mr Tannous has announced he will resign from the Liberal Party state executive at the end of the month.

Issue raised in budget estimate hearings

The issue was raised in budget estimates hearings in August.

When asked hypothetically what would happen if registered lobbyists from the Liberal Party state executive claimed to be able to deliver results because of their party positions, Premier Barry O'Farrell responded he would potentially refer the matter to ICAC.

But the Premier was less decisive when Labor's Luke Foley drew his attention to Mr Tannous, which makes exactly that claim.

"Do you think that statement is a breach of the lobbyist code of conduct Premier?" Mr Foley asked.

"I'll defer to the Director General," Mr O'Farrell said.

The Director General said he would seek advice on the matter.

Election sparks reshuffle

In September, the election of Tony Abbott as Prime Minister sparked a reshuffle within the state executive of the NSW Liberal party.

Liberal powerbroker Michael Photios announced his resignation from his official role with the executive effective at the end of October, after 30 years of voluntary service.

Mr Photios runs a lobby firm, Premier State, and had been under pressure over his influence on the state government.

Mr Abbott said he was determined to ensure there would be no such conflicts of interest nationally.

In a statement, Mr Photios said he agrees with Mr Abbott although he believes that potential conflicts of interest, either real or perceived, need to align with community expectation.