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- - Engine light helpps (https://www.mazda3club.com/mazda3-mazdaspeed3-98/engine-light-helpps-56426/)

Claughton17

Mar 25, 2012 02:07 AM

Engine light helpps

So I keep having an engine light come on and off at Random times, so I got it tested and it Sao code po421 was just wondering of anybody knows what that code means? Thanks!

Thrizzl3

Mar 26, 2012 12:52 PM

P0421 Warm Up Catalyst Efficiency Below Threshold

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