Removal Procedure

CAUTION: The oxygen sensor uses a permanently attached pigtail and connector. Do not remove the pigtail from the oxygen sensor. Damage to or removal of the pigtail connector could affect proper operation of the oxygen sensor.

CAUTION: The use of excessive force may damage the threads in the exhaust manifold/pipe.

NOTE:

The in-line connector and louvered end must be kept clear of grease, dirt or other contaminants. Avoid using cleaning solvents of any type. DO NOT drop or roughly handle the heated oxygen sensor (HO2S).
The HO2S may be difficult to remove when the engine temperature is less than 48°C (120°F).

Fig 1: Identifying Exhaust Manifold Heat Shield

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Remove the exhaust manifold heat shield studs (2).
Remove the exhaust manifold heat shield (1).

Fig 2: Identifying Engine Harness Electrical Connectors - Top Of Engine

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If equipped with regular production option (RPO) MN5, perform the following steps, remove the connector position assurance (CPA) retainer.
Disconnect the engine harness electrical connector (2) from the HO2S.
Remove the HO2S connector clip from the thermostat housing.

Fig 3: Identifying Engine Harness Electrical Connectors

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If equipped with RPO M86, perform the following steps, remove the CPA retainer (2).
Disconnect the engine harness electrical connector (1) from the HO2S.
Remove the HO2S connector clip from the thermostat housing.

Fig 4: HO2S

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Using the J 39194-C , remove the HO2S.