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96 2rz O2 sensor

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Old 11-28-2012, 05:47 AM   #1
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96 2rz O2 sensor

Throwing a cel, scanner says catalyst bank one low efficiency or something like that. I'm guessing its the O2 before the cat ? Sound right ?
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Old 11-28-2012, 10:01 AM   #2
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I have a feeling that it is not right. A P0420 is catalytic converter low efficiency. That USUALLY, but not always, indicates either a bad catalytic converter, or a problem with the O2 sensor AFTER the cat, which is what measures the cats efficiency. An exact code number would help.
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