2014 Mazda 3 p0421 code
Hey everyone,
I have a 2014 Mazda 3 2.0L isv model I have done the TSB ECM update for this code (p0421 bank 1) i have changed both o2 sensors everything but attempt to replace the catalytic converter for this code to my understanding this car has 2 catalytic converters (1 by the exhaust manifold and 1 under the car by the tail pipe) how am I supposed to know which one to change? the code is p0421 bank 1 thanks! |
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