Nissan Repair Questions? Ask a Mechanic for Answers ASAP
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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.https://dl.dropboxusercontent.com/u/104923897/P0420%20Nov%2028.pdfThe 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.https://dl.dropboxusercontent.com/u/104923897/P0057%20Nov%2028.pdf