What does it mean when the engine emission system warning light is on?

[PeterFitz]

When the engine emission system warning light is on, it indicates a malfunction in the emission system. Possible causes: Issues in the fuel supply system, ignition system, etc., engine overheating, backfire, leading to sintering or peeling of the three-way catalytic converter substrate, increased exhaust resistance, etc. Automobile exhaust system: The automobile exhaust system refers to the system that collects and discharges exhaust gases, typically composed of the exhaust manifold, exhaust pipe, catalytic converter, exhaust temperature sensor, automobile muffler, and exhaust tailpipe. Solutions for the warning light: Start and turn off the vehicle three times in a row, or disconnect the negative terminal of the engine battery, wait for 30 seconds, and then reconnect it. After performing the above steps, check whether the engine warning light on the dashboard is still on.