OEM code 0420 Catalyst efficiency low.

Tiny
ANONYMOUS
  • 2001 FORD TAURUS
  • 133,900 MILES

OEM code 0420
Catalyst efficiency low bank 1
oxygen sensor monitor the catalytic converters ability to store oxygen
Probable cause
Catalytic converter defective

Wednesday, March 27th, 2013 AT 6:09 PM

1 Reply

Tiny
ASEMASTER6371
  • EXPERT
  • 25,526 POSTS

Cat has failed and needs to be replaced.
Roy

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Wednesday, March 27th, 2013 AT 7:05 PM

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