P0420 and exhaust leaks
Over the years I have learned many great things from the
iATN gurus . The P0420 testing tactics have evolved over the
years and have morphed into a pretty simple trouble tree .
The Input of many people way smarter than myself seem to
agree on a few easy steps. One of them being the presence of
exhaust leaks. As you already know some exhaust leaks are
rather hard to find . Mike from Ohio
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