4-Wire O2 Sensor Woes

[Six_Shooter]

When you first posted you had 3 wires going to ground, which is why I said you didn't have any wires going to your ECM by your description...

I believe you have your black and grey wires backwards, but I go by OEM wire colours on the other side of the plug, when I use a 4 wire O2 sensor, so I don't recall exactly what those wires match up to on the sensor side.

[350yj]

I will try reversing the black and gray wires tomorrow. Here is a link to the Bosch wiring diagrams I found.

https://www.boschautoparts.com/docum...sf-p3yjnLK0ksg

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Kris