Oxygen Sensor Replacement For Turbos (11-34-89)

Publication date: 1989-02-10
Reference number: 11-34-89

OXYGEN SENSOR REPLACEMENT FOR TURBOS

TECHNICAL SERVICE BULLETIN

Reference Number(s): 11-34-89, Date of Issue: February 10, 1989
Superceded Bulletin(s): 11-33-88, Date of Issue: January 6, 1989

Model(s): All Subaru Turbo Models

Group: Engine Performance

Bulletin No.: 11-34-89

Date: February 10, 1989

This bulletin supersedes and cancels Service bulletin No. 11-33-88, release date of January 6, 1989.

NOTE: Allow exhaust center pipe to cool to the touch before attempting to remove oxygen sensor from vehicle.

Remove spare tire and supporter assembly.
Disconnect oxygen sensor wire harness at connector.
Spray base of oxygen sensor with penetrant oil and allow to stand for one (1) minute or more.
Using Special Tool (P/N 499990110), and a 3/8 ratchet, "TIGHTEN" (Rotate Clockwise), the oxygen sensor until you feel it move slightly. This will help loosen any carbon which may surround the threads.
"LOOSEN" (Rotate Counter-Clockwise) the oxygen sensor approxi- mately 1/8 turn and spray penetrant on the base of oxygen sensor once again. It may be necessary to rotate the oxygen sensor back and forth several times while spraying penetrant oil on the base of sensor to completely free it from the exhaust pipe.

NOTE: Care must be taken to prevent damage to the exhaust pipe threads.

Coat oxygen sensor threads with an anti-seize compound and torque it to specifications: 18-25 ft. lbs. (2.5-3.5 kg/m). DO NOT ALLOW COMPOUND TO CONTACT SENSOR BODY.
Reconnect the oxygen sensor harness.
Re-install the supporter assembly and spare tire.