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Court documents show Pivac, who lives in the North Shore suburb of Murrays Bay, was stopped by police on Oteha Valley Rd.
Testing revealed he had a blood-alcohol reading of 171 micrograms, more than twice the legal limit of 80mg.
Pivac appeared in the North Shore District Court last Friday where he pleaded guilty to a charge of drink-driving. He was fined $1050 and disqualified from driving for nine months.
His bosses at Auckland Rugby were told of the incident as soon as it happened.
"Auckland Rugby is disappointed in Wayne's poor decision, as is he," chief executive Andy Dalton said.
"It has been dealt with by the North Shore District Court. Wayne has been dealt with internally the same as any staff member who compromises the values and standards of Auckland Rugby."
A spokeswoman said she could not comment more on this as "it is an employer/employee issue".
Pivac didn't want to talk about the incident.
"I've got nothing to say," he told APNZ.
This is Pivac's second stint in charge of the Auckland team, which made the ITM's premiership semi finals last year.
He was named New Zealand Rugby coach of the year in 2003 after a successful first spell with the Auckland team that included three provincial titles
Pivac has also coached Fiji, Northland and North Harbour, the team he played for in the 1980s.
- By Jimmy Ellingham of APNZ