P0420

Tiny
MOLLIE BENNETT
  • MEMBER
  • 1996 FORD TAURUS
Gave car tune up and found vacuum leak, engine light still comes on, code 420,430
Saturday, September 25th, 2010 AT 6:48 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
P0420
Catalyst System Efficiency Below Threshold (Bank 1)

P0430
Catalyst System Efficiency Below Threshold (Bank 2)

Have any other codes come up? It sounds like either there is a problem with the catalytic converters or O2 sensors.
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Sunday, September 26th, 2010 AT 1:04 AM

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