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It has a brand new cat so thats not the problem, the check engine light is on because it threw the EGR code and the knock sensor code (irrelevant), and would the EGR not functioning at all cause high nox emissions? or does it do nothing in low rpms and just kick in at high rpms.. I was pretty sure it was the EGR, but I just wanted someone to confirm my thoughts.
also does anyone have some good pictures of how the EGR is fully set up?
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