Chapter 17 - Videos

Exhaust and Emission System

Exhaust and emission systems on newer vehicles have become more complex than in the past. The emission system is used to monitor air-fuel ratios and has many benefits to the operator and the environment. For many years, automotive manufacturers were just concerned about getting the hot and toxic exhaust gases out to the side or rear of the vehicle. Today exhaust and emission systems are complex mechanisms that provide safety, efficiency, and concern for our fragile environment. Periodically, exhaust and emission system components need replacing.

Exhaust Systems – Explained
(Engineering Explained)

How exhaust systems work

Replacing an Oxygen Sensor on Your Car
(Bosch Auto Parts)

Four-Way Conversion Catalyst


Three-Way Catalytic Converter


Clearing California Skies
(California Air Resources Board)

How Mufflers Work
(Summit Racing)


Exhaust Resonator
(Pep Boys Auto)


Emissions – Gas vs. Electric Cars
(Union of Concerned Scientists)

How EGR Works


How to Replace a PCV Valve
(O’Reilly Auto Parts)

Selective Catalytic Reduction

How to Refill DEF

EPA – Ozone Standards

Air We Breathe

Environmental Science and Protection Technician

These videos are embedded from YouTube and have been organized to support content learned in the Auto Upkeep curriculum. Even though the videos have been screened, due to the nature of the Internet students may navigate from the intended video to unanticipated content. It is also possible that the video maker may edit the video that is embedded. If this site is used in an educational institution it is recommended that the instructor review the videos before sending students to them.

If you would like to view additional videos from the video maker, the video’s YouTube Channel link is in parentheses ( ) after the title. and do not endorse any YouTube Channel listed. The videos were embedded to help you understand basic car care, maintenance, repair, and how cars work.

If you find additional YouTube videos that you believe would support the content in the Auto Upkeep curriculum, please email us the YouTube link.