Mazda 3 Engine Light Code P0421
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Mazda mazda3 won't start Engine light goes on and off periodically Mazdaspeed 3 brake lights and horn not working cel codes p0703 / p0571
Check engine light on with dtc p0421
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Rough Idle 2009 Mazda 3 Check engine light code P0123 - YouTube
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Mazda 3 Check Engine Light: Q&A on E85 Tester, P2404 Code, and Evap
MAZDASPEED 3 BRAKE LIGHTS AND HORN NOT WORKING CEL CODES P0703 / P0571
Check Engine Light On With DTC P0421 - 2014-2016 Mazda
Engine light goes on and off periodically - Mazda Forum - Mazda
Q&A: Understanding P0421 Error Code in Mazda & Peugeot