P0421 Mazda
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Mazda 6 p0421 code: meaning, causes, how to fix
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Obd code p0421, 1999 mazda protege — car forums at edmunds.comP0421 code: warm up catalyst efficiency below threshold (bank 1) .
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P0421 | Mazda 6 Forums
Mazda 6 P0421 Code: Meaning, Causes, How to Fix | Drivetrain Resource