What Causes the Emission Exceedance Warning Light to Illuminate?
1 Answers
Emission exceedance warning light illumination is caused by a damaged catalytic converter. Below is more relevant information: 1. Principle: When the computer receives parameters from the oxygen sensor indicating that the tailpipe emissions severely exceed national legal standards, and the internal program cannot adjust them back within the standard range, the engine control computer will then trigger the pollution emission exceedance warning light (yellow pollution light) on the dashboard to alert the owner to check the engine's pollution emission light at a service station. 2. Reasons for the pollution light to illuminate: (1) Poor gasoline quality can lead to incomplete combustion of the air-fuel mixture in the cylinders, causing the pollution light to illuminate and also easily leading to carbon buildup. (2) Carbon deposits in the intake tract or on the piston crown can result in poor atomization, leading to incomplete combustion and causing the pollution light to illuminate. (3) During cold starts, especially when temperatures drop sharply, the computer's temperature correction may cause the pollution light to illuminate during startup. However, once the temperature stabilizes at a certain level without fluctuations, the light will stabilize accordingly.
