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  1. J

    2011 equinox P420 won't go away

    Hello, My wife has a 2011 equinox with the 2.4l. When this code first popped up I found that the exhaust manifold was cracked nearly in half. I replaced it, the gaskets, and the upper O2 sensor while I was there. Following that it popped back up, I know these are known to burn oil like...
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