P0420

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

JACOBANDNICKOLAS

MECHANIC
108,217 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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P0420

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