Uploaded December 2016 | Updated September 2026, 2 weeks ago

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Oxygen, lambda, or air/fuel sensors are a critical but ofttimes overlooked component of fuel injected engines. Further to my video about upstream sensors, here are a few points relating to downstream (after cat) O2 sensors and using them for some basic tests.

First O2 Sensor Basics video: youtu.be/ekf-Xy9nEwY

O2 sensor socket tool Amazon links ~
US: amzn.to/2f9nuy6 | UK: amzn.to/2gsm6gj

Amazon for O2 sensors ~
US: amzn.to/2fd7zCu | UK: amzn.to/2ePIZbW

OBD2 scan tool shown ~
Review: youtu.be/KdvnPC204zU
Amazon US: amzn.to/2cgqSbU | UK: amzn.to/2cd2Jm0

(Using the above Amazon links helps support my channel and is appreciated!)