Infiniti P0420 Catalyst System Efficiency Below Threshold Bank 1 Diagnostic Trouble Code, Definition, explanations, And diagnosis Guide


What does this mean?

OBD2 Code P0421 Infiniti Definition:
Basically this means that the oxygen device at the bottom of the auxiliary switch at bank 1 detects that the switch is not working as well as it should (according to the specs). It’s part of the car’s exhaust system.


Possible indicators of OBD code P0421 Infiniti
You probably won’t see any driving problems, although there may be signs. This code can be used when the engine starts to freeze in the last 1-2 days.


Potential triggers for OBD P0421 Infiniti code
Code P0421 Infiniti could mean that one or more of the following have happened: The backup switch is not working

Possible Answers

Measure voltage on oxygen sensor on Bank 1 (rear sensor, or sensor after switch). Instead, it may be a good idea to test any oxygen O2 device while you still have it. One thing to note is that most car manufacturers offer a little extra security on air-related issues. So if you have a new car but it is out of bampala and bumper certification, there may still be warranty on this type of problem. Many manufacturers offer a five-year warranty on these items. It is worth researching.

Information for OBD2 Code to be applicable to Infiniti:

, 2013 Infiniti M35h GT, 2013 Infiniti JX, 2013 Infiniti FX, 2011 Infiniti QX, 2011 Infiniti M35h, 2011 Infiniti M, 2011 Infiniti JX Concept, 2011 Infiniti IPL G Coupe, 2011 Infiniti EX30d, 2009 Infiniti G37,2009 Infiniti FX50,2009 Infiniti FX37,2009 Infiniti FX35,2009 Infiniti Essence Concept, 2009 Infiniti EX37,2008 Infiniti QX56,2008 Infiniti M45x, 2008 Infiniti M45s, 2008 Infiniti G37 Coupe, 2008 Infiniti EX35,2007 Infiniti G35 Sedan, 2007 Infiniti EX Qeptept, 2006 Concept, 2006 Infiniti Q Concept, 2006, 2006 Infiniti Q45,2006 Infiniti M45,2006 Infiniti M35x, 2006 Infiniti M35,2006 Infiniti FX45,2005 Infiniti Q45,2005 Infiniti G35,2005 Infiniti FX45,2004 Infiniti QX56,2004 Infiniti M45 Concept, 2004 Infiniti I35,2003 Infiniti QX 2003 Infiniti Q45,2003 Infiniti M45,2003 Infiniti I35,2003 Infiniti G35,2003 Infiniti FX45,2003 Infiniti FX35


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2. Look up the next one , please use this box. Enter the 5 hard codes in the search box and send to search.

3. Don’t think special means the same for other car manufacturers as there are many factors that make it workable.

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