Thread: Diagnosing a P0420 code
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Old 06-25-2018, 05:13 AM   #4 (permalink)
Baltothewolf
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Winsight - '00 Honda Insight
90 day: 56.69 mpg (US)

Miaderp - '95 Mazda Miata
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Buy a spark plug anti fouler and drill it out to 1/2 inch and install it on the downstream sensor and just be done with it. Worry about it next time you have to smog it.
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