2000 Nissan Sentra code PO420 and PO430

2000 NISSAN SENTRA
89,700 MILES • 4 CYL • FWD • AUTOMATIC
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NNILOO
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My engine light is on. I asked AutoZone and the did Zero it but it is back on again. They gave me these 2 codes after they diagnozed it. Would you please help me to fix it. Thanks. Niloo
Feb 28, 2009 at 8:40 AM
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F4I_GUY
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P0420 is for bank 1. P0430 is for bank 2.

This is an excellent link explaining the code and how to diagnose it properly.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
Mar 7, 2009 at 8:06 PM