Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › How do O2 sensors work? If one is defective. › Reply To: How do O2 sensors work? If one is defective. October 28, 2020 at 7:02 pm #986874 Richard KirshyParticipant These should answer any questions. https://www.youtube.com/results?search_query=+how+O2+sensors+function