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Mercury Master
4,390 Answers
- Posted on May 02, 2009
Re: How do you replace the oxygen sensors on a 1995 merc...
They just unscrew from the exhaust pipe.
Heated Oxygen Sensor (HO2S)
SPECIAL SERVICE TOOL(S) REQUIRED
Description
Tool Number
Oxygen Sensor Wrench
T94P-9472-A
Removal and Installation
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Disconnect battery ground cable (14301). Refer to Section 14-01 .
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On 3.0L (4V) engine remove cowl extension and right side of leaf screen.
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Disconnect engine control sensor wiring (12A581) from heated oxygen sensors (HO2S) (9F472). Do not remove harness connectors from the brackets.
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Raise vehicle on hoist. Refer to Section 00-02 .
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NOTE: If excessive force is needed to remove a heated oxygen sensor, lubricate the heated oxygen sensor with penetrating oil prior to removal.
Remove heated oxygen sensors from exhaust manifolds (9430) using Oxygen Sensor Wrench T94P-9472-A.
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To install, reverse Removal procedure. Apply a coating of anti-sieze compound to threads of heated oxygen sensor. Tighten heated oxygen sensors to 34-46 Nm (26-34 lb-ft).
Heated Oxygen Sensors—3.0L (4V) Engine
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