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Old 08-24-2021, 03:23 PM   #1
clockrepairman
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Dazed po420 po430 code

Hello, just wanted to post that I had the code po420 pop up on my Saturn Aura XE 96,000 miles. This car has never wanted for an oil change, I have just got lazy and have paid to have the oil changes done. I always assumed that the tech would try to sell parts and check the air filter and things like that. I guess not. I used my code reader and pulled up the graph showing the before and after ratings on all 4 O2 sensors, the lower sensor on bank 1 was all over the place. Fortunately, I did some more research and found one website that said to check the air filter. I pulled it out and it was very plugged. I took it out threw it away and ordered a fresh one, I started up the car and let it warm up and watched the graphs of all 4 O2 sensors after they were warmed up bank 1 was erratic for a short time, and it just slowly looked almost identical to bank 2. The problem is solved. Lesson learned, start with the easiest, cheapest possible cause and start there. I am so glad I didn't purchase a pre cat for it. I wonder how often this is misdiagnosed?
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Old 08-26-2021, 07:37 PM   #2
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2008 AURA XE
Default Re: po420 po430 code

Good info, thanks
...
2008 Saturn Aura XE 3.5L 4 spd
2000 Saturn SL1 1.9L SOHC (Retired)
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