P0420 fix
toyotanation.com
P0420 fix
I recently ran into this with my brothers Sienna. Code P0420 was present. I tested the converters and it appeared they were bad. I then checked the tech info center at www.techinfo.toyota.com and ran across a TSB on this . ECM replacement was required. I replaced the ECM a week ago and 2 days...
Aug 11, 2019
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[nonda Auto DIY Center] P0420 is the most common engine error code, it stands for catalyst system efficiency below threshold. Check out this self-repair video tutorial created by nonda's expert mechanics. Fix it yourself and save $$$ on your repair fees. Don't forget to claim your FREE ZUS Smart Vehicle Health Monitor here https://bit.ly/FreeZUS-ADC and get an in-depth diagnosis of your vehicle condition. | nonda
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