If you build engines, tune cars, or even just like mashing your foot on the throttle with conviction, you’ve probably heard ...

Don't let failing oxygen sensors compromise your engine's performance. O2 sensors are critical to emissions control on your car, SUV or truck. As the name implies, the O2 sensor (also called an ...

Can you remove an O2 sensor with a standard wrench? Learn when you need a special socket, what's in a kit, and how thread chasers can save your DIY project.

We tested popular wideband O₂ controllers against lab-grade equipment to see how accurate their lambda readings really are under real engine conditions.

Q: I would like to know when it is necessary to change O2 sensors. I have a Chevy Malibu 2001. Also, if these sensors are to be replaced, why are they so hard to take off? They seems welded to the ...

Q: Where are the oxygens sensor(s) located on a 1999 Toyota Corolla? A: In the exhaust system, before and after the catalytic converter. Q: We just recently purchased a 1996 Ford Explorer, and it has ...