I get code PO420 catalyst system efficiency.

Tiny
ANONYMOUS
  • 2003 NISSAN ALTIMA
  • 185,000 MILES

I get code Po420 catalyst system efficiency below threshold bank 1

Thursday, November 29th, 2012 AT 8:54 AM

1 Reply

Tiny
CARADIODOC
  • EXPERT
  • 26,046 POSTS

Replace the driver's side catalytic converter.

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Thursday, November 29th, 2012 AT 9:14 AM

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