What does 'Check Emission System' mean?

1 Answers
LaPhoebe
07/29/25 9:10am
If the 'Check Emission System' warning appears on the car's dashboard, it indicates a possible fault in the exhaust pipe, which could be due to poor gas combustion. It may also alert if the three-way catalytic converter or oxygen sensors are dirty. It's best to have it inspected at a 4S shop. Below is more information about car exhaust pipes: 1. Composition of the exhaust pipe: A car's exhaust pipe consists of three sections: the front pipe, mid pipe, and tail pipe. The three-way catalytic converter is located in the front pipe, also known as the exhaust manifold, which can usually be seen by opening the engine hood. The three-way catalytic converter may fail after prolonged use, and if it does, it could cause the engine warning light to illuminate. 2. Function of the oxygen sensor: Most cars have two oxygen sensors, one located behind the exhaust manifold and the other behind the three-way catalytic converter. The oxygen sensors detect the oxygen content in the exhaust and feed this information back to the ECU.
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