https://stream.echo6.co/videos/watch/3784f14e-b03a-465c-8f7a-f9aa35019d72 This is an older GM vehicle (1994) but the tests I am showing can be applied to all oxygen sensor circuits that are using a bias voltage on the O2 signal wire. GM O2 Sensor Testing Using O2 Sensor bias voltage to quickly test for an open in the signal circuit. Symptoms: failed emission test, check engine light, poor gas mileage Fix:, replace faulty O2 sensor Testing methods shown:, how to use bias voltage on an O2 sensor to determine wiring integrity (opens and shorts) Tools used:, Scan tool, incandescent test light Related videos:, What can cause an O2 sensor to read near 5 volts? (bias voltage) https://youtu.be/v8XrM-7BuOg, Oxygen Sensor quick tests (bias voltage) https://youtu.be/nLhqTG0iBVU, Engine runs rich P0172, P0175 from a blown O2 heater fuse https://youtu.be/SEuGtggZAvo, Playlist: (Chapters 4 and 5) Fuel Trim and Oxygen Sensor Testing https://www.youtube.com/playlist?list=PLD2809EEC7BAAF989, For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book. Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium https://www.scannerdanner.com/join-scannerdanner-premium.html There is a 14 day free trial. On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere! Disclaimer: Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC. Mon, 04 May 2026 01:28:37 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/3784f14e-b03a-465c-8f7a-f9aa35019d72 All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.