Catalyst system below threshold bank 1 problem?

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... which is Catalyst System; Bank 1: Efficiency Below Threshold. I have diagnosed the problem and it turned out to be fuel filter. - Read more

... Catalyst System; Bank 1: Efficiency Below Threshold ... Catalyst Efficiency Below Threshold Bank 1 2. sensor ... Jun 21, 2014 ยท if the catalyst is the problem, ... - Read more

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Catalyst system below threshold bank 1 problem? resources

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P0420 Catalyst System below threshold (Bank 1) I failed inspection . How do this problem get fixed? Thank you. - Ford 1998 Explorer Problem by pspght

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Subaru WRX Forum > WRX Tech Forums > Problem Diagnosis > P0420 Catalyst System Efficiency Below Threshold ... P0420 Catalyst System Efficiency Below Threshold (Bank 1)?!

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code reads p0420,Catalyst system efficiency below level Bank 1, could you tell me what cat this is

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Don't know much about windows, but it sounds like a dirty switch, or a bad relay or servo. Your other problem is most likely an O2 sensor, but you might be unlucky...

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wow i love guess and check technicians. its either the rear o2 or cat crapped out.. highly unlikeyly both. but yea replacing both will fix your problems.

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