Hello, I know there are a few threads on this topic. I have read through them all and can't find my specific question. With that being said: I recently threw a p0491 & p0492 code. I've reset it twice with it only to come back after the drive cycle was completed. Today I was checking some of the vacuum lines and realized the secondary air pump was leaking a good amount of air from the sides. Is this normal? Can someone shed some light on the way this system should operate? I have attached a picture. The yellow circle is where the air was coming from. Thanks!
Ok just wanted to follow up on this old topic. My check engine light eventually came back on and I dealt with it for a while. Today I finally got around to doing a vacuum test on the lines. I had some leakage and traced it up to this (attached image)
From reading through the forums I've gathered that if there's a large enough leak it will throw both p0491 & p0492 codes. I believe that was my problem. I think it's all sorted now but any feedback is appreciated.