13K views · 69 reactions | “Car exhaust system basics! Oxygen Sensor #1 checks engine gases, then they pass through the catalytic converter to reduce pollution. Oxygen Sensor #2 measures efficiency. Together, they lower emissions and trigger the check engine light if there’s a problem. Stay tuned for more auto tips!” #careskillsacademy #skilldevelopment #automobilerepairingcourse | Care Skills Academy | Facebook