"As Winston sat next to the lady, he started to fear the worse," the police social media post said.
"Despite a moment of panic," the two officers decided to divert to the nearby Morrinsville Fire Station where a defibrillator was located and there were fire crew with advanced medical training.
The fire teams found a pulse and gave the injured woman oxygen.
The woman later arrived at Waikato Hospital in a critical condition, but eventually gained consciousness.
The quick thinking police officers and medical training of fire crew "no doubt" saved her life earlier in the night, police said.
"So a big thanks to the Morrinsville Volunteer Fire Brigade," police said.
"A great show of how the emergency services work together."