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Ask Mike V. Your Own Question
Mike V.
Mike V., Infiniti Mechanic
Category: Infiniti
Satisfied Customers: 25350
Experience:  Factory trained to repair Nissan and Subaru.
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1 code po430, 2 code po420,and 3 code po430, Yes I reset it

Customer Question

1 code po430, 2 code po420,and 3 code po430
JA: Just to clarify, what's the exact code? And have you tried to reset it?
Customer: Yes I reset it and it can back on
JA: What is the model/year of your Infiniti?
Customer: 2005 qx56 5.6 engine
JA: Are you fixing your QX56 yourself? What have you tried so far?
Customer: Nothing I need to know what codes mean first. And yesI am fixing it myself
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 10 months ago.
Category: Infiniti
Expert:  Mike V. replied 10 months ago.

Hello and thank you for your question!
My name is ***** ***** I will be assisting you with your question today.

Expert:  Mike V. replied 10 months ago.

How is the vehicle running? Loss of power or running rough or anything?

Customer: replied 10 months ago.
Running ok
Expert:  Mike V. replied 10 months ago.


These codes are for the bank 1 and bank 2 catalytic converters. The codes mean they are working below efficiency. Since the vehicle isn't showing any signs of a real issue, it might be a good idea to change gas stations. Sometimes the different additives can cause the codes to appear even though there is no problem.

Clear them and try a different gas station.

Also, give me a couple minutes. Sometimes there are service bulletins for reprogramming the ecm when you get both codes together like this. I want to take a couple minutes and see what I can find for you.

Expert:  Mike V. replied 10 months ago.

I double checked and there aren't any bulletins for these codes.

It's just not common for both to fail at the same time. One other thing would be the condition of the engine. If it's been a while since it had a tune up, it wouldn't be a bad idea to put a new air filter and set of plugs in it to hopefully solve the issue. If the light continues to come on with these codes, then you are likely going to need new converters.

Please let me know what more I can do to assist you today. Also, please remember to rate my answer, Just Answer does not compensate me for my time and resources. Follow up questions are included in the price of your question. If you are using the free trial, or have a subscription a rating is still required.
Thank you so much!