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

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

Knowing a few precise mechanic terms can turn a confusing estimate into a clear conversation and keep you from paying for ...

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.

A reliable indicator of the air quality in offices, classrooms, or living rooms is the CO2 content. In fresh air, the concentration of carbon dioxide is around 400 ppm. This stands for “parts per ...

The AOPA has tested unleaded avgas on a Beechcraft Baron demonstration aircraft, shown on display at EAA AirVenture Oshkosh ...

The GM Duramax 3.0L LZ0 engine relies on a Diesel Particulate Filter, or DPF, to reduce emissions. Now, we're taking a closer ...

Taiwan on Wednesday opened its first two hydrogen refuelling stations in the territory, marking a long-awaited step into hydrogen mobility as the government and state-owned energy firms evaluate the ...

CNET’s expert staff reviews and rates dozens of new products and services each month, building on more than a quarter century of expertise. Air quality infamously drops as the days grow cold and we ...