My 2009 Subaru Impreza Outback and my sons car (2003 Toyota Avalon XLS) have the infamous CEL.
I'm receiving my OBDII sensor tomorrow (OBDLink MX WiFi) to better assist in analyzing the issue more in depth, but I already have a good idea that it's the output 02 sensor.
My sons car has the P420 fault, and I won't know what the fault is with the Subaru until I check it tomorrow night after I get back from the Shul.
As for a fix, I have a CEL eliminator coming (Blox Racing BXFL-00108 Check Engine Light Eliminator Adapter) to try, but I have concerns if this will affect the air/fuel mix from the computer,hence causing more harm than good. I'm also considering the idea of making an RC filter to put on the outgoing 02 sensor, instead of the CEL eliminator. I feel the filter may keep signals balanced better than the CEL eliminator, and allow the computer to process and blend the fuel mix more appropriately.
What can you tell me about this problem and my proposed fixes?

Thank you,
Randy

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Randy
Randy

Thank you Scotty. Unfortunately, there's no one like you anywhere in the Pennsylvania area that I've come across. Heck, I'm not sure there is anyone else like you, period, lol. I wish I was in your area, or you in our area. I'd be over in a jiffy. How much are those dealer scan tools? I'm guessing a lot.

ScottyKilmer
ScottyKilmer

You eliminate the cel , that doesn't fix anything. You have a root underlying problem, and with that code, there are over a dozen differrent possibilites, from a weak cat, to a lean running engine to a weak fuel pump. Sometimes even weak gasoline with trip that code, I've had guys switch to shell high test gas and then that light went out on avalons in the past. Good Luck, try to find a guy like me to analyze it in person with his dealer scan tool, guessing is foolhardy with that code

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