What Are the Causes of Excessive Engine Emissions?

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Excessive engine emissions can be caused by poor fuel quality, incomplete fuel combustion, failure of the three-way catalytic converter, etc. Specific reasons include: Poor fuel quality: Low-quality fuel will result in excessive exhaust emissions regardless of how it is burned. Incomplete fuel combustion: Chemical complexes formed by sulfur, phosphorus in the fuel, and carbon monoxide from incomplete combustion lead to excessive emissions. These issues are primarily caused by faults in the fuel system (intake system, three-way catalytic converter, fuel injectors, etc.) or lack of regular cleaning. Failure of the three-way catalytic converter: The three-way catalytic converter, installed in the vehicle's exhaust system as the most important external purification device, converts harmful gases such as CO, HC, and NOx from vehicle exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction reactions.