What to Do If Vehicle Exhaust Fails to Meet Standards?
2 Answers
Solutions for non-compliant vehicle exhaust include: 1. Clean the three-way catalytic converter; 2. Clean the front oxygen sensor; 3. Use higher-quality gasoline; 4. Check the engine's working condition; 5. Accelerate and drive dozens of kilometers on the highway. Vehicle exhaust is an environmental pollution caused by automobile emissions, with pollutants including: carbon monoxide, hydrocarbons, nitrogen oxides, sulfur dioxide, lead compounds, and particulate matter. Reasons for non-compliant vehicle exhaust include: 1. Poor fuel quality; 2. Malfunctioning three-way catalytic converter or oxygen sensor; 3. Large spark plug electrode gap; 4. Overly rich or lean air-fuel mixture; 5. Poor gasoline atomization; 6. Abnormal engine operation; 7. Dirty intake system, exhaust system, or fuel system; 8. Vehicle aging.
Two years ago, my car failed the emissions test. At that time, I first checked the basic spark plugs and found severe erosion. After replacing them, the emissions improved significantly. Then, I checked if the air filter was dirty or clogged—timely cleaning or replacement can improve air intake. A faulty oxygen sensor can also cause uneven combustion, and replacing it isn’t expensive. Fuel system issues like clogged fuel injectors can be addressed with additives or professional cleaning. Lastly, if the catalytic converter is clogged or failing, replacing it at a repair shop is the key solution. Remember, don’t delay—small issues can worsen and affect engine lifespan. Checking these points before regular annual inspections can reduce trouble. Driving will also be more fuel-efficient and smoother.
