After showing you guys (and my class) the operation of an oxygen sensor on a motorcycle, I used this opportunity to discuss a very difficult topic from chapter 5 in my Engine Performance Diagnostics book. The topic is "Oxygen Sensor Bias Voltage". In this video I want to show you what it is, and how to use it to your diagnostic advantage. The first part of this video we will be reviewing some pages from my book, so if you've been wondering what type of material is in there, this is your chance to see. Then I move back to my 2016 Harley Davidson V-Rod Muscle, to show the exact same bias voltage used on some of our automotive systems is also being used on motorcycles. To see the rest of my classroom lectures on Oxygen Sensors and Fuel Trim as well as hundreds of exclusive case studies, subscribe to ScannerDanner Premium, right here on YouTube. There is a 14 day free trial period with no obligation. Thanks for your support!

Engine Performance Diagnostics chapter 5

Topics discussed

  • what is oxygen sensor bias voltage
  • how to use bias voltage to quickly locate opens and shorts in a circuit
  • what happens to bias voltage when the sensor changes temp.
  • does an oxygen sensors resistance change with temp.?
  • how to quickly check a heater circuit of an oxygen sensor
  • what is a "time to activity" test?

Tools used

  • digital multimeter
  • lab scope
  • Scope Distribution Box w/Amp Probe Loops (aeswave)

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(Chapters 4 and 5) Fuel Trim and Oxygen Sensor Testing

Related videos:

How to test an O2 sensor on a Harley Davidson:


Ford O2 Sensor Testing - wiring tests (no bias voltage):


Honda Oxygen Sensor quick tests (bias voltage):


How to quickly test an oxygen sensor circuit (GM bias voltage):


What can cause an O2 sensor to read near 5 volts? (Chrysler bias voltage):


System Too Rich P0172, P0175 from a blown O2 heater fuse (Jeep):


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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available 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. 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!