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Exhaust leak and CEL?

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I have a minor exhaust leak at the flange between the header and cat #1. I also keep getting a cel p0420 which is the oxygen sensor. Could my sensor be just fine and the leak is causing the code or are the two unrelated? By leak I mean I am getting the "pebbles in a can" sound. 97 lgt with uel headers.



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An exhaust leak will cause an o2 sensor code. If you're leaking exhaust before your sensor, your sensor is going to give a false reading. If the leak is bad enough - the reading will be outside of specs -- making your check engine light come on.


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