Code P0421 Mazda 3
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P0421 – warm up catalytic converter bank 1 efficiency below threshold
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P0421 – Warm Up Catalytic Converter Bank 1 Efficiency Below Threshold

Mazda 3 P0421 Code: Meaning, Causes, How to Fix | Drivetrain Resource

How to clear your engine light after upstream bank 1 oxygen sensor

P0421 – Warm Up Catalytic Converter Bank 1 Efficiency Below Threshold

P0421 and P0431 code | Mazda 6 Forums

Mazda 626 Service Engine Light Code P0421: Q&A on Troubleshooting and
P0421 | Mazda 6 Forums