The air flow from the secondary air injection pump doesn’t reach into the exhaust system because the system is blocked. Therefore, the O2 sensors before the catalytic converter don’t register a dip in mixture and it sets the code and results in the check engine light coming on.
Using the AGA N62 Secondary Air Cleaner Kit.
This takes an extremely expensive repair down to a fraction of the cost by using a very simple kit made by AGA Tools.
Secondary Air Tool