What does it mean when the dashboard displays 'Please Check Emission System'?
2 Answers
The dashboard displaying 'Please Check Emission System' indicates a potential issue with the exhaust pipe. The vehicle's exhaust pipe is equipped with a three-way catalytic converter designed to reduce the levels of pollutants in the exhaust gases. If the three-way catalytic converter fails, it can cause the vehicle's emissions to exceed the standard limits, resulting in the vehicle failing the annual inspection. The car's exhaust pipe, also known as the exhaust flexible pipe, is installed between the engine exhaust manifold and the muffler, providing a flexible connection for the entire exhaust system. It serves to reduce vibration and noise, facilitate installation, and extend the lifespan of the exhaust muffler system. The exhaust pipe is primarily used in light-duty vehicles, compact cars, and buses. Its structure consists of a double-layer corrugated pipe covered with a steel wire mesh sleeve, with clamping rings at both ends. To enhance the muffling effect, the corrugated pipe can be equipped with an expansion joint or mesh sleeve internally.
That day when I was driving, the 'Check Emission System' warning light suddenly appeared on the dashboard, which made me nervous, so I quickly pulled over. It means the vehicle's emission control system detected an issue, possibly due to a minor component failure, such as a faulty oxygen sensor or an exhaust pipe leak, causing excessive exhaust emissions. That time, I went to a nearby repair shop, and the mechanic scanned it with a diagnostic tool, finding that the oxygen sensor readings were inaccurate. It cost about 300 yuan to fix. Ignoring this light for a long time can increase engine burden, even pollute the environment, or cause the vehicle to fail the annual inspection. Remember to check if the fuel tank cap is tightened properly—it's a common but easily overlooked cause. It's recommended not to ignore this warning and to address it promptly to save money and ensure safety.
