Mazda 6 P0421. P0421 and P0431 code Mazda 6 Forums 2.2M posts 103K members Since 2002 Mazda6club.com is a forum dedicated to the. The P0421 code appears in a 2010 Mazda 6 2.5L because of the following conditions: Leakage exhaust system; Loose A/F sensor; Loose HO2S; TWC deterioration or malfunction; PCM malfunction; What are the Possible Causes of the P0421 Code?
P0421, CO2 sensor bank 1 Bob Is The Oil Guy from www.bobistheoilguy.com
Unfortunately, the P0421 is a fairly straight forward code, and a fairly common problem A P0421 happens when the downstream O2 sensor inverts its signal too quickly (basically matching the upstream O2 sensor) The computer reads this as a catalytic converter that is no longer reacting and just allowing un-catalyzed exhaust to pass by.
P0421, CO2 sensor bank 1 Bob Is The Oil Guy
The Oxygen Sensors measure the amount of emissions in the exhaust going into, and then out of the converter. 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 Unfortunately, the P0421 is a fairly straight forward code, and a fairly common problem
P0421 on 2003 Mazda Protege 5, catalytic converter remove and install. don't jump until you have exhausted checking other things. How can I repair OBDII code P0421 in a Mazda related to the Warm Up Catalyst System Right Efficiency Below Threshold? - Repair options may include replacing the catalytic converter, fixing any exhaust leaks, replacing the oxygen sensor, or addressing issues with the engine's air-fuel mixture
P0421 Mazda 6 Forums. 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 This code points to a failing Warm-Up Catalytic Converter