2009 nissan altima p0420 code

Asked by SoMisguided May 11, 2019 at 07:32 PM about the 2009 Nissan Altima 2.5 S

Question type: Maintenance & Repair

First got the code threshold low bank 2. Replaced
the rear catalytic converter and downflow pipe.
About 3 months later got the code again threshold
low bank 1 replaced the 02 sensor and the front
catalytic converter. The catalytic converter was
definitely bad. Its been another 2 months and i
have the code again threshold low bank 1. Any
ideas?  So frustrating.  

1 Answer
64,510

firebird338 answered 4 years ago

Had same problem at one time check engine light comes on put scanner on it says bank one oxygen sensor replaced sensor two days later light comes back on saying bank one oxygen sensor took vehicle to AAA auto center they said needed to replace catalytic converter vehicle running to good for it to be that as far as I was concerned so started using the high octane gas ( 93 and 94 ) instead of the low octane gas ( 87 ) to make a long story short it took ten tank fills and light coming on and going off four times but light is now out and stays out. Still use the ( 87 ) octane gas but not all the time use the ( 89 ) octane gas.

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