How to Fix the P0421 Code on Mazda Miata MX5 Mavyn

Dtc P0421 Mazda. P0421 Code Warm Up Catalyst Efficiency Below Threshold (Bank 1) In How to Fix the DTC P0421 Mazda? Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors If it fails to heat up efficiently, it can trigger this diagnostic trouble code

In layman's terms, it indicates that your Mazda 6's catalytic converter is not scrubbing pollutants efficiently One common cause is a malfunctioning catalytic converter

Codigo P0421 Mazda 3

Then again, maybe I've just invented another automotive myth. P0421 diagnostic help please: On my 2014 CX5 2.5 at 91,000 miles, I've also been getting P0421 consistently (I have a little gauge that monitors). The P0421 fault code is triggered by the Engine Control Module (ECM) when it detects that the rear HO2S (Heated Oxygen Sensor) value is getting closer to the value of the front HO2S

Code P0421 Mazda Warm Up Catalyst System Right Efficiency Below Threshold. How to Fix the DTC P0421 Mazda? Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors Some vehicles may experience the check engine light on with DTC P0421:00 (Catalytic converter system) without experiencing poor engine performance or misfire.

P0421 check engine light fix catalyticconverter o2sensor p0421 YouTube. Another potential culprit is an oxygen sensor that isn't functioning correctly. The Mazda 2.5L is 2/3 the displacement of the 3800 (3.8L) and I change the filter roughly 2/3 as often (20K vs 12-14 K on the 3800)