Upstream Heated Oxygen Sensors 1/1 and 2/1 Replacement

This engine uses four heated oxygen sensors, two upstream, one in each exhaust manifold.

REMOVAL

WARNING: THE EXHAUST MANIFOLD, EXHAUST PIPES AND CATALYTIC CONVERTER BECOME VERY HOT DURING ENGINE OPERATION. ALLOW ENGINE TO COOL BEFORE REMOVING OXYGEN SENSOR.

1. Disconnect the heated oxygen sensor electrical connector.

CAUTION: When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.

Upstream Heated Oxygen Sensor Right Bank 1/1:

Upstream Heated Oxygen Sensor Left Bank 2/1:

2. Use a socket such as Snap-On YA8875 or a crow foot wrench to remove oxygen sensor.

INSTALLATION
1. After removing the sensor, the exhaust manifold threads must be cleaned with an 18 mm X 1.5 + 6E tap. If reusing the original sensor, coat the sensor threads with an anti-seize compound such as Loctite 771-64 or equivalent. New sensors have compound on the threads and do not require an additional coating. Tighten the sensor to 28 N.m (20 ft. lbs.) torque.
2. Connect the heated oxygen sensor electrical connector.