How to fix VW code P0491 Secondary Air Injection Low Flow
2:50
YouTubeFlat Rate Mechanic
How to fix VW code P0491 Secondary Air Injection Low Flow
And this video will be diagnosing a p0491 secondary air injection low-flow on this Volkswagen Passat with a 2.5 L engine. First we verified the air injection pump was working and it was then we checked the pressure sensor and moved on to test the combination valve for the air injection by applying power and ground to it. On this particular ...
209.4K viewsFeb 12, 2019
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