What does it mean when the catalytic converter system efficiency is below the threshold?
2 Answers
Catalytic converter system efficiency below the threshold refers to the poisoning of the catalytic converter caused by high lead content in gasoline, requiring cleaning or replacement of the three-way catalytic converter. It is recommended to use high-grade clean gasoline in daily use. The main reasons for catalytic converter system efficiency being below the threshold include high-temperature deactivation, chemical poisoning, carbon deposit deactivation, and clogging failure. For vehicles with low mileage, cleaning the three-way catalytic converter may resolve the issue. For vehicles with higher mileage or older age, cleaning may not be effective, and the catalytic metals may not be properly restored, necessitating replacement of the three-way catalytic converter. Catalytic converter system efficiency below the threshold is currently the most common issue with environmentally friendly engines. All systems in an environmentally friendly engine are designed to maximize the conversion efficiency of the three-way catalytic converter. Maintenance of the three-way catalytic converter is central to the upkeep of environmentally friendly engines. Once the three-way catalytic converter is poisoned, deactivated, or clogged, conversion efficiency cannot be guaranteed, and the environmentally friendly engine will not function properly.
As someone who frequently works on car repairs, I know that catalytic converter system efficiency below threshold is quite common. Simply put, the device that converts exhaust gases isn't working efficiently anymore and fails to meet the minimum standard set by the car's computer, often triggering OBD trouble codes like P0420. This happens because the internal structure of the catalytic converter has aged or become clogged, preventing it from effectively converting harmful gases like carbon monoxide into harmless substances. Common causes include engine air-fuel ratio imbalance, exhaust leaks, or long-term use of low-quality fuel leading to carbon buildup. The consequences? Significantly increased exhaust pollution, potentially causing the car to fail emissions tests; engine performance may also decline, manifesting as sluggish acceleration and increased fuel consumption. For repairs, start by diagnosing trouble codes and checking related sensors; minor issues may be resolved with specialized cleaning agents, while severe cases require replacing the catalytic converter—costly but necessary. For daily prevention, pay attention to maintaining the engine and exhaust system, and avoid short trips that lead to carbon buildup. Don't delay repairs for too long, as it may damage more components.
