Bank 1 sensor 2 downstream?

JWARD47

MEMBER
2010 INFINITI G37
3.7L
V6
2WD
AUTOMATIC
200,000 MILES

I have the vehicle listed above Sedan. The Oxygen sensor Left side (Passenger side) bank 1 sensor 2 downstream connectors are damage be on recognition. The wire connectors on both sides are down to the male and female pins but my problem is that I do not know how to match up the wires. The oxygen sensor side has 2 white, 1 grey, and 1 black. The main harness side has black, white, red, and yellow. My plan is to replace the oxygen sensor and the female connector on the wire harness,
Does anyone have access to wiring diagrams that will help me get the right match? Any help would be appreciated.

3 Replies

STEVE W.

MECHANIC
13,443 POSTS

Okay, it sounds like someone has replaced the sensor before as the OE ones generally have different colors. The vehicle side is also a bit different than the service information, but we can sort that out if you have a test light. What I show for the vehicle side is Black White Red and Pink.
The Red wire should be a battery power feed with the key on and goes in terminal position 2 in the connector. Connect the test light to ground and touch that wire it should light.

The Black wire on the vehicle side should be a ground connection to the PCM and goes in position 1 in the connector. If you use the battery feed on the red wire the test light connected between them should light with the key on.

Now the White wire should go in position 4 on the connector and it is the signal return from the sensor.

The Pink wire I show in connector position 3 should be the yellow wire you have left over. It is the O2 heater control circuit.
On your sensor the 2 white wires are for the O2 heater circuit. Those normally connect to the power feed (red wire) and the control wire (pink or yellow wire in your case), they are interchangeable in this case. The Black wire on your sensor should be the sensor ground and should connect to the black wire on the vehicle side as a ground to the PCM and the Gray wire on the sensor is the signal return which should connect to the White wire on the vehicle side.

Image (Click to make bigger)