Forget the dynamometer (treadmill) exhaust emissions test. The new test involves checking your gas cap, looking at the check-engine light and plugging a device into your car’s diagnostic link.

There's a lot going on inside your vehicle at any given time, whether you're idling at a red light or driving at freeway speeds. Much of this activity involves chemical reactions that — while ...

As a result, from September this year, the European Union is adding a Real Driving Emissions (RDE) test to the Euro 6 regulations that govern what comes out of a car's exhaust. It's a test that ...

Periodic testing requirements are effective Oct. 1, 2024. For example, a vehicle with a compliance deadline of Feb. 1, 2025, may submit a passing emissions test as early as November 3, 2024 ...

I/M 240 tests require visual inspection of emissions control devices, an evaporative emissions test and a transient drive-cycle exhaust emissions test, performed while the vehicle is running on ...