How To Test An O2 Sensor

What is an Oxygen Sensor? What does it do? When I get an O2 sensor fault code, should I just replace the sensor or do testing to prove that it is faulty?
Today we are looking at a Toyota Camry 2003 4 cylinder with a fault code, but no check engine light.
How do we determine what the fault code is and what testing we need to do.
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#sensors#AutomotiveMaintenance#oxygensensor
Disclaimer:
MiracleMAX wants you to be safe, however, no guarantee can be given against improper use or unauthorised modifications on the information provided. The repair shown in this video is carried out at your own risk and any property damage or injury is your own responsibility. Please ensure you carry out this repair safely using approved safe work practices, correct use of recommended tools and equipment. This video is educational only and is no guarantee of a result if done incorrectly. Any injury, damage or loss due to incorrect use of tools, information or equipment is the sole responsibility of the person carrying out the repair and not MiracleMAX
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[@colinreid7305]

You remind me of my instructor in the very early 1970s, clear logical and excellent communications. Using the multimeter and scope takes away all guessing, but sadly some people jump the gun and forget the fundamentals. Great easy-going video.

[@MiracleMAX]

Thank you for your comment. It means a lot. 👍🤗

[@GerardBurkeBurkesGarage]

Nice work as always mate, enjoyed the video. I think you may need a new assistant 📹😂

[@MiracleMAX]

Thanks mate....you can't choose your relatives 😊☹️

[@nava-kit]

learned valuable thing

[@MiracleMAX]

Thank you - glad to hear 👍

[@13yearsaprepperr.jtilbury.51]

Hey Max , I have seen so many O,S changed then only to find the power feed isn't there ,,,,
always
check confirm fix !
Great video mate
Rob
Nowra
NSW

[@MiracleMAX]

Thanks Rob - it's all about the diagnosis! 👍

[@RichieRich845]

👍

[@MiracleMAX]

Thanks 👍