What to Do If Vehicle Fails Emission Test During Annual Inspection?
1 Answers
Solutions for vehicles failing emission tests during annual inspection: 1. Clean the three-way catalytic converter and oxygen sensor. Insufficient combustion of the engine's air-fuel mixture can generate large amounts of carbon deposits, which are discharged through the exhaust pipe and can adhere to the interior of the three-way catalytic converter and the surface of the oxygen sensor. 2. Clean or replace spark plugs. Ignition system faults can also cause excessive vehicle emissions. 3. Clean the carburetor. The carburetor's function is to atomize gasoline, allowing for more complete combustion. If the carburetor is not cleaned for a long time, it may lead to incomplete gasoline atomization, resulting in incomplete combustion in the engine. This not only easily accumulates large amounts of carbon deposits but also causes emission failure issues. 4. Perform a deep engine cleaning.