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Ron, ASE Certified Technician
Category: Nissan
Satisfied Customers: 35876
Experience:  34 years of automotive Repair
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Cel on codes po420 cat EFF low b1 and poo57 ho2s2 b2 heater

Customer Question

Cel on codes po420 cat EFF low b1 and poo57 ho2s2 b2 heater cuircut low ?
Submitted: 10 months ago.
Category: Nissan
Expert:  Ron replied 10 months ago.

Hello. My name is ***** ***** I am happy to assist you today. Give me just a moment to review your post, and I'll be right back with the help you need.

Expert:  Ron replied 10 months ago.

The fault code P0420 in most cases set due to a failing catalytic converter (Bank 1) . To check this to be sure I have enclosed the test steps in the link below.

The code P0057 sets in most cases due to a failing heater in the HO2S sensor. Bank 2 is the driver's side bank. In order to determine if the HO2S has failed I have enclosed the steps to check it in the link below as well.