Oxygen Sensor Replacement Procedure (using 3-Wire Universal) 1990-1992

By: Matt ???

1. Disconnect OXS sensor connector (located at passenger rear engine

mount).

2. Remove OXS connector bracket from passenger rear engine mount

(10mm).

3. Raise the car and support it securely on jackstands.

4. Unscrew OXS sensor from the top front of catalytic converter. The

special OXS sensor wrench is a good investment. A 22mm crowsfoot

extension would probably work too. Otherwise the three bolts

which hold the cat to the downpipe will have to be removed so the

cat can be lowered enough to get a wrench on the sensor.

5. Remove sensor and harness from car.

6. Cut the sensor off of the wiring harness approx. 3" back from the

sensor.

7. Splice in the universal 3-wire sensor using the crimp connectors

and the heatshrink tubing supplied, or solder and heat shrink

the sensor into the harness. (Refer to diagram for connections).

8. Remove the plastic cap from the sensor. Be careful you don't get

any anti-seize on the sensor probe (if you do, wipe it off very

carefully so none gets in the probe slots).

9. Screw the sensor back into the cat. Torque to 37 ft lbs.

10. Fish the connector bracket from the cat to the engine mount and

reattach the bracket to the mount.

11. Secure the OXS harness wire with the clip on the subframe, so it

doesn't lay on the hot exhaust. I also wrapped this clip with

some electrical tape since my original harness was about to be

eaten by the sharp edges on this clip.

12. Reconnect OXS harness connector.

13. Smile, you just saved yourself ~$70 on parts alone.

BTW, I bought my Bosch Universal 3-wire OXS sensor from GPR for $69. GPR's number is 1-800-321-5432