What are the causes of engine emission failure?
2 Answers
Engine emission failures can be caused by: 1. Sensor issues: When water temperature, crankshaft position, air flow, intake temperature, or oxygen sensors are damaged, have poor connections, or experience signal interruptions, the vehicle's ECU cannot accurately obtain engine data; 2. Maintenance problems: Irregular maintenance and poor driving habits can increase the operational burden on the engine; 3. Fuel quality issues: The fuel added to the car has specific octane ratings, and failure to meet these requirements can cause engine wear; 4. Poor mixture combustion: This can lead to engine carbon buildup or knocking issues, which will be detected by the engine's oxygen sensor; 5. False faults: These may occur due to impacts while driving, tampering with certain engine connectors, or temporary ECU signal interruptions.
The most common causes of engine emission failures include problems with the oxygen sensor, which monitors exhaust gases. Once it malfunctions, it cannot properly regulate the air-fuel mixture combustion, leading to excessive emissions. Another issue is a clogged catalytic converter, which loses its purification function over time due to carbon buildup. Additionally, a blocked air filter restricts the engine's air intake, affecting combustion efficiency. Poor fuel quality or dirty fuel injectors causing irregular fuel injection can also lead to problems. Electrical issues such as aging wiring and ECU faults are often culprits as well. I often notice these minor issues while driving. If not addressed promptly, the emission warning light will come on, resulting in increased fuel consumption, reduced power, and higher pollution. Therefore, I recommend regular inspections and visiting a professional repair shop as soon as the light appears to avoid safety hazards.
