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Locating O2 sensors

Tiny
LISA D CAREY
  • MEMBER
  • 2004 NISSAN XTERRA
  • 3.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 214,000 MILES
O2 sensors on the driver and passenger sides has come up as an error code. I am trying to figure out if it is the upstream and/or downstream. It is the top that has been identified.
Saturday, September 30th, 2017 AT 10:53 AM

1 Reply

Tiny
STEVE W.
  • MECHANIC
  • 13,442 POSTS
First, what is/are the actual codes you have. There are many times an O2 sensor has been changed when it was not the real problem.

As for how many sensors you have, four total. Two in front of the forward converters and two behind them.
Bank one is the passenger side. Upstream = Sensor 1 / Downstream = Sensor 2.
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Saturday, September 30th, 2017 AT 11:41 AM

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