I received a code 21 and replaced all my O2 Sensors. Still getting code 21 after clearing codes. I would like to check the wiring harness and need the pin numbers on the computer connector. Does anyone have the pin numbers for the O2 sensors?

 

Looks like pins 51, 29, 30, and 1 (or A1)

I might suggest that you have the codes read instead of using the MIL. It is far more specific, denoting which O2 sensor is the problem based on the code.

You can obtain a list of the codes from Autozone.com