Nissan Forum - Conversation Between smj999smj and marsh9`9
Conversation Between smj999smj and marsh9`9
Showing Visitor Messages 1 to 1 of 1
  1. marsh9`9
    Mar 13th, 2019 06:19 PM - permalink
    marsh9`9
    Hello I performed a back pressure exhaust test on the upstream 02 port and got a zero reading even after increasing rpm. So according to what I have read and viewed the converters are good.. I know the rear one is because it is new along with the muffler. I am thinking if I install the upstream converter the PO420 code will still cause the check engine light to reappear. I have changed both O2 sensors with Bosch, OEM.. the upstream about 2 years ago the and rear with the new exhaust replacement parts. The gas mileage is as it should be 22 city and more on highway.
 
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