Why does engine emission failure occur?

[Reed]

Engine emission failure is caused by issues in the emission system. Reasons for emission failure: Most engine exhaust system failures are due to the quality of domestic fuel, damage to the oxygen sensor in the three-way catalytic system, or poisoning of the three-way catalytic converter. Solutions for emission failure: If the engine exhaust system fails while driving, immediately reduce speed and drive to the nearest service station for inspection and repair. If the vehicle stalls and cannot start, this is usually due to a fuel pump or ignition system failure—call for a tow truck directly. If the vehicle can still be driven but exhibits severe shaking, lack of acceleration power, or similar symptoms, turn off the engine immediately and call for a tow truck.

[LeEzra]

Having run my repair shop for so many years, I've seen plenty of emission failures. The core issues often lie in exhaust system components. For example, a faulty oxygen sensor affects air-fuel ratio adjustment, leading to excessive exhaust emissions; a clogged or failed catalytic converter can't filter harmful gases; dirty fuel injectors cause inaccurate fuel spraying and incomplete combustion; or a stuck EGR valve disrupts exhaust gas recirculation. All these will trigger the dashboard warning light. First, use a diagnostic tool to read the trouble codes for confirmation—don't replace parts blindly. Additionally, poor fuel quality and excessive carbon buildup can worsen the problem. It's recommended to use high-quality gasoline and regularly drive at highway speeds to help clear deposits. Delaying repairs can easily damage the engine and increase repair costs. Seeking professional inspection promptly saves both hassle and money.

[VanAsher]

Last time my car's emission light came on was quite a headache, with noticeably reduced power and higher fuel consumption while driving. Common triggers include a dirty mass airflow sensor giving inaccurate readings or fuel leaks contaminating emissions. First, check if the fuel cap is tightened properly to prevent air leaks, and see if the air filter is clogged and affecting air intake. Daily habits like using fuel system cleaners can reduce carbon buildup, but prompt diagnosis after the light appears is crucial—otherwise, you might fail the annual inspection or face fines. Pay attention to dashboard warnings and performance changes while driving, prioritizing prevention. Regular maintenance ensures the system runs healthily, avoiding small issues turning into big troubles.

[Avery]

From an environmental perspective, emission failures pose significant hazards as they exacerbate air pollution by releasing toxic gases like carbon monoxide, which harm health. Typical causes include exhaust treatment system failures, such as aging catalytic converters with reduced filtration capacity or faulty sensors leading to regulation imbalances. Timely repairs not only restore vehicle performance but also protect the environment. Advocating for green driving practices, such as smooth acceleration and reduced hard braking, helps lower emissions. Regular vehicle maintenance should be ensured to keep systems operating efficiently.