What will happen if the secondary air pump is not replaced when it fails?

1 Answers
DiVera
07/29/25 7:13pm
The secondary air pump failing and not being replaced will affect the three-way catalytic converter. Below are specific details about the secondary air pump: 1. Function: The secondary air pump supplies air to the three-way catalytic converter when the engine is cold. This allows the exhaust gases to mix with the oxygen in the air for secondary combustion, thereby increasing the temperature of the three-way catalytic converter. This helps the catalytic converter reach its optimal operating temperature more quickly, reducing the emission of harmful substances and serving an environmental protection purpose. 2. Other Causes: The symptoms of a faulty secondary air pump include the illumination of the check engine light and the appearance of a fault code indicating "incorrect secondary air flow." These symptoms may also be caused by other issues such as a broken secondary air pipe, a ruptured vacuum hose, a damaged secondary injection valve, incorrect positive wire installation, or a blocked exhaust channel in the cylinder head.
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