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This video will show you how to replace the upstream oxygen sensor bank 1 on a Nissan Armada and or Infiniti Qx56/Qx80 this was done on a 2012 but should be the same for various years of these vehicles and possibly the Nissan Titan. Vehicle was throwing code p0420 Catalyst system efficiency bank 1 and replacing the O2 sensor fixed this code. O2 sensor was purchased from Amazon listed below is a link to it and also a link to the 7/8" O2 sensor socket.
Oxygen Sensor: www.amazon.com...
Oxygen Sensor Socket: www.amazon.com...
#p0420
#p0430
#infiniti
#nissan