Thread: p0420 code, which o2 sensor do i replace?

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#5 Re: p0420 code, which o2 sensor do i replace?
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02-15-2010

Does it say "PO420 catalyst system efficiency below thresh hold (bank 1)"? If so, I would say the rear 02 sensor.

'99 GTP coupe - Growing mod list/summer car
'98 GTP Sedan - Winter ride, 315,000+kms and going strong!

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