2001 Toyota Corolla p0420

2001 TOYOTA COROLLA
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TINKERSTINKER87
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2001 Toyota Corolla 4 cyl Automatic

took car for emissions test failed due to this P0420(bank1)(5) ?
Aug 2, 2010 at 10:49 AM
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MMPRINCE4000
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It is a cat. effeciency below threshold error.

Downstream O2 sensors measure CAT effeciency. Problem could be CAT itself or O2 sensor.
Aug 4, 2010 at 7:35 AM