Lewandowski resigned from the force in November, a spokesperson said.
At the misconduct hearing, a statement read in the former PC’s absence heard he expressed “sincere and unreserved regret” for his actions and admitted it could undermine confidence in the police, the force said.
The statement said he had been experiencing a number of personal issues at the time that led him to behave “out of the character”.
Temporary Chief Constable Steve Cooper said it was “wholly unacceptable” for a member of the force to behave in this way, adding: “As an organisation we invest a lot of time and effort into explaining the dangers of drink-driving to the public.
“As this former officer has now admitted, his actions had the potential to undermine public confidence in policing and, by extension, in his former colleagues.
“That is an extremely serious matter that could only be addressed by a finding of gross misconduct and his formal dismissal from the organisation.”