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possible exhaust leak in 5.3 2013 silverado

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  • possible exhaust leak in 5.3 2013 silverado

    hello all, I have a new to me truck that I'm trying to get the check engine light off. I have an intermittent p015b cel (delayed response lean to rich). I know from research this could be 02 sensor or possibly an exhaust leak. I know anything is possible at any time are these 5.3 run on cng prone to exhaust leaks. I only question cause I hear random ticking at light throttle sometimes but not always. The o2 sensor was only $28 so I bought one and put it in today but don't want to assume that is the fix.

    Thanks in advance.

    Shaun
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