Can someone tell me how to convert my one-wire O2 sensor on a PR3 to a 4-wire on a P28? Basically need the pinout on the P28...

Thanks!

 

The CX is a 1 wire O2 sensor that is a WHT wire that goes directly to D14 which is O2 sensor input.

To convert to a 4 wire O2 sensor. That WHT wire will be utilized and goes to the WHT wire on the 4 wire O2 sensor.

The others are as follows from the O2 sensor, wire color change (if any) and to the according pinout to OBD1 ECU:

From O2:

O2 ground: GRN to GRN/WHT to D22 (which is also for Intake Air Temp sensor (white sensor on the intake manifold)

O2 Power: BLK to YEL/BLK to junction connector that goes to A25 (or B1, whichever you prefer)

Heater Control: BLK to ORG/BLK to A6.

HTH man

 

i just connect the wires to places in the engine bay. green and a black to ground, other black to switched power, and white to signal