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Old 07-14-2019, 02:01 AM   #230 (permalink)
mpg_numbers_guy
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Toby - '13 Toyota Prius C
90 day: 61.95 mpg (US)

Daz - '15 Mazda 3 iTouring w/ Tech Package
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Quote:
Originally Posted by 19bonestock88 View Post
Car is throwing an 0420 code, you know, “catalyst efficiency below threshold”... it runs in closed loop though and over 95% of the time runs totally fine
If it's P0420 then replacing the other piping won't fix it; it needs a replacement catalytic. You could probably try cleaning it too. RockAuto has good prices on aftermarket catalytics, or you could just straight pipe it with an O2 fooler.
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2013 Toyota Prius C 2 (my car)


2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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