What Does Engine Emission Fault Mean?
3 Answers
Engine emission control system fault refers to a problem in the engine emission system. The following measures can be taken: 1. If the car can still be driven when the engine fault indicator light is on, the owner can continue driving, but it is best to go to the nearest repair shop in time to let the maintenance personnel detect the engine and related components, find out the faulty part and repair it. 2. You can repeatedly start and turn off the car three times in a row, or disconnect the negative terminal of the car battery, wait for 30 seconds and then reconnect it, to check whether it is a false fault problem of the engine.
When the engine emission malfunction light popped up on the dashboard, I was completely stunned. Last time I drove my dad's old Corolla, the same thing happened - the whole car was shaking, and black smoke was coming out of the tailpipe. The mechanic said this kind of fault is actually caused by problems in the exhaust treatment system, where the computer detects excessive emissions and triggers the warning. Common causes include a clogged catalytic converter, faulty oxygen sensors, or malfunctioning fuel injectors leading to incomplete fuel combustion. The most troublesome part is when some vehicles experience cylinder misfires, causing noticeable shaking during acceleration. From my experience, first try adding two bottles of fuel system cleaner. If the light stays on after highway driving, then it's time for a thorough inspection - otherwise fuel consumption will skyrocket, and you'll definitely fail the annual inspection.
The engine emission fault light indicates abnormal operation of the exhaust purification system. Modern vehicles are equipped with OBD systems that trigger warnings whenever emissions exceed standards. Issues typically occur in three key areas: the front-end sensor section (such as failed mass airflow sensors or oxygen sensors affecting air-fuel mixture ratios), the mid-section combustion process (incomplete combustion due to aged spark plugs or excessive carbon buildup), and the rear-end exhaust treatment devices (most commonly reduced efficiency of catalytic converters). I recall when repairing a Volkswagen Tiguan last year, many owners experienced premature catalytic converter failure due to fuel quality issues. It's recommended to perform regular fuel system maintenance, especially checking air filter condition after long-distance driving.
