P0420

1996 FORD TAURUS
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MOLLIE BENNETT
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  • 1 POST
gave car tune up and found vacuum leak,engine light still comes on,code 420,430
Sep 24, 2010 at 11:48 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 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.
Sep 25, 2010 at 6:04 PM
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