Uploaded May 2026 | Updated September 2026, 1 day ago

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A bad secondary air injection pump can trigger a check engine light, cause loud whining on cold start, and lead to emissions test failure even if the car drives normally. In this guide, we cover 5 common symptoms of a failing secondary injection pump, including secondary air flow codes, pump noise that sounds like a vacuum cleaner, and a pump that doesn’t run at all on cold mornings.



Timecode:
00:00:00 - Short intro
00:00:42 - What the secondary air injection pump does.
00:01:20 - Symptom 1.
00:01:55 - Symptom 2.
00:02:27 - Symptom 3.
00:03:02 - Symptom 4.
00:03:43 - Symptom 5.
00:04:17 - Replacement cost and what affects the price.
00:04:52 - What to do before replacing the pump.