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...
Feb 4, 2010
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