A wideband O2 sensor works in tandem with your wideband gauge to tell you exactly what is happening inside your engine. Screwed right into your exhaust, this sensor reads the actual oxygen content in the spent gases as they leave the combustion chamber. Positioning is crucial and depends entirely on your setup. You will usually find it mounted before the catalytic converter, right by the exhaust collector piping, or just downstream of the turbo if you are running forced induction. Whether you are working with a stock daily, a full bolt-on street car, or a purpose-built track weapon, this little probe is the heavy lifter that gathers the raw data your gauge needs so you don't melt a piston.
You literally can't run a wideband air-to-fuel ratio gauge without the matching sensor feeding it information. The good news is that most complete wideband gauge kits we carry come right out of the box with the required O2 sensor included. However, these sensors live in a harsh, superheated environment and will eventually wear out, foul up, or fail. That is why we also stock standalone replacement sensors and bare gauges to get you back up and running without forcing you to buy a whole new kit. Keep your readings dead accurate and protect your build by swapping out a tired sensor the second it starts acting up.
