How should i go about removing the top oxygen sensor?

you need oxygen socket and 3/8 ratchet wrench.easy way to replace oxygen sensor is to start vechicle let run few minutes just enough to get exhaust system hot so it will make it easier remove oxygen sensor.just remove heat shields disconnect oxygen sensor electrical connector then replace oxygen sensor.use penetrating oil let it soak around oxygen sensor for 20 minutes that will help make it easier to remove sensor.

Removal & Installation

Raise and support the vehicle.
Support rear of the powertrain frame.
Remove four rear frame bolts.
Lower the frame no more than 73.2 mm (3 inches).
Disconnect the rear oxygen sensor electrical connector.
Remove the rear oxygen sensor from the rear exhaust manifold.

To install:

Install the rear oxygen sensor in the rear exhaust manifold. Tighten the rear heated oxygen sensor (HO2S) sensor to 41 Nm (30 ft. lbs.).
Connect the rear oxygen sensor connector.
Raise the frame.
Install the four rear frame bolts. Tighten the frame bolts to 100 Nm (74 ft. lbs.).
Lower the vehicle.


Heated Oxygen Sensor Bank 1 Sensor 1 (HO2S 1/1)

WARNING: Handle the oxygen sensors carefully in order to prevent damage to the component. Keep the electrical connector and the exhaust inlet end free of contaminants. Do not use cleaning solvents on the sensor. Do not drop or mishandle the sensor.

CAUTION: Remove oxygen sensors with the engine temperature above 48C (120F). Otherwise the oxygen sensors may be difficult to remove.

A special anti-seize compound is used on the oxygen sensor threads. New service sensors should already have the compound applied to the threads. Coat the threads of a reused sensor with anti-seize compound P/N 5613695 or equivalent.



Fig. Showing the location of the HO2S Bank 1 Sensor 1

Heated Oxygen Sensor Bank 1 Sensor 2 (HO2S 1/2)

CAUTION
Handle the oxygen sensors carefully in order to prevent damage to the component. Keep the electrical connector and the exhaust inlet end free of contaminants. Do not use cleaning solvents on the sensor. Do not drop or mishandle the sensor.

CAUTION: Remove oxygen sensors with the engine temperature above 48C (120F). Otherwise the oxygen sensors may be difficult to remove.

WARNING: A special anti-seize compound is used on the oxygen sensor threads. New service sensors should already have the compound applied to the threads. Coat the threads of a reused sensor with anti-seize compound P/N 5613695 or equivalent.



Fig. Showing the location of the HO2S Bank 1 Sensor 2

Raise and support the vehicle.
Remove the heat shield.
Disconnect the heated oxygen sensor electrical connector.
Remove the heated oxygen sensor.

To install:

Install the heated oxygen sensor. Tighten the heated oxygen sensor (HO2S) to 41 Nm (30 ft. lbs.).
Connect the heated oxygen sensor electrical connector. CAUTION
Ensure connectors are securely installed beneath harness heat shield to prevent damage.
Install the heat shield.
Lower the vehicle.


Heated Oxygen Sensor Bank 2 Sensor 1 (HO2S 2/1)

CAUTION: Handle the oxygen sensors carefully in order to prevent damage to the component. Keep the electrical connector and the exhaust inlet end free of contaminants. Do not use cleaning solvents on the sensor. Do not drop or mishandle the sensor.

CAUTION: Remove oxygen sensors with the engine temperature above 48C (120F). Otherwise the oxygen sensors may be difficult to remove.

WARNING: A special anti-seize compound is used on the oxygen sensor threads. New service sensors should already have the compound applied to the threads. Coat the threads of a reused sensor with anti-seize compound P/N 5613695 or equivalent.

Raise and support the vehicle.
Remove the air deflector.
Disconnect the front oxygen sensor electrical connector.
Remove the front oxygen sensor from the front exhaust manifold.



Fig. Showing the location of the HO2S Bank 2 Sensor 1

To install:
Install the front oxygen sensor in the front exhaust manifold. Tighten the front HO2S sensor to 41 Nm (30 ft. lbs.).
Connect the front oxygen sensor electrical connector.
Install the air deflector.
Lower the vehicle.

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Removal & Installation

Raise and support the vehicle.
Support rear of the powertrain frame.
Remove four rear frame bolts.
Lower the frame no more than 73.2 mm (3 inches).
Disconnect the rear oxygen sensor electrical connector.
Remove the rear oxygen sensor from the rear exhaust manifold.

To install:

Install the rear oxygen sensor in the rear exhaust manifold. Tighten the rear heated oxygen sensor (HO2S) sensor to 41 Nm (30 ft. lbs.).
Connect the rear oxygen sensor connector.
Raise the frame.
Install the four rear frame bolts. Tighten the frame bolts to 100 Nm (74 ft. lbs.).
Lower the vehicle.


Heated Oxygen Sensor Bank 1 Sensor 1 (HO2S 1/1)

WARNING: Handle the oxygen sensors carefully in order to prevent damage to the component. Keep the electrical connector and the exhaust inlet end free of contaminants. Do not use cleaning solvents on the sensor. Do not drop or mishandle the sensor.

CAUTION: Remove oxygen sensors with the engine temperature above 48C (120F). Otherwise the oxygen sensors may be difficult to remove.

A special anti-seize compound is used on the oxygen sensor threads. New service sensors should already have the compound applied to the threads. Coat the threads of a reused sensor with anti-seize compound P/N 5613695 or equivalent.



Fig. Showing the location of the HO2S Bank 1 Sensor 1

Heated Oxygen Sensor Bank 1 Sensor 2 (HO2S 1/2)

CAUTION
Handle the oxygen sensors carefully in order to prevent damage to the component. Keep the electrical connector and the exhaust inlet end free of contaminants. Do not use cleaning solvents on the sensor. Do not drop or mishandle the sensor.

CAUTION: Remove oxygen sensors with the engine temperature above 48C (120F). Otherwise the oxygen sensors may be difficult to remove.

WARNING: A special anti-seize compound is used on the oxygen sensor threads. New service sensors should already have the compound applied to the threads. Coat the threads of a reused sensor with anti-seize compound P/N 5613695 or equivalent.



Fig. Showing the location of the HO2S Bank 1 Sensor 2

Raise and support the vehicle.
Remove the heat shield.
Disconnect the heated oxygen sensor electrical connector.
Remove the heated oxygen sensor.

To install:

Install the heated oxygen sensor. Tighten the heated oxygen sensor (HO2S) to 41 Nm (30 ft. lbs.).
Connect the heated oxygen sensor electrical connector. CAUTION
Ensure connectors are securely installed beneath harness heat shield to prevent damage.
Install the heat shield.
Lower the vehicle.


Heated Oxygen Sensor Bank 2 Sensor 1 (HO2S 2/1)

CAUTION: Handle the oxygen sensors carefully in order to prevent damage to the component. Keep the electrical connector and the exhaust inlet end free of contaminants. Do not use cleaning solvents on the sensor. Do not drop or mishandle the sensor.

CAUTION: Remove oxygen sensors with the engine temperature above 48C (120F). Otherwise the oxygen sensors may be difficult to remove.

WARNING: A special anti-seize compound is used on the oxygen sensor threads. New service sensors should already have the compound applied to the threads. Coat the threads of a reused sensor with anti-seize compound P/N 5613695 or equivalent.

Raise and support the vehicle.
Remove the air deflector.
Disconnect the front oxygen sensor electrical connector.
Remove the front oxygen sensor from the front exhaust manifold.



Fig. Showing the location of the HO2S Bank 2 Sensor 1

To install:
Install the front oxygen sensor in the front exhaust manifold. Tighten the front HO2S sensor to 41 Nm (30 ft. lbs.).
Connect the front oxygen sensor electrical connector.
Install the air deflector.
Lower the vehicle.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

TO REPLACE OXYGEN YOU NEED A SLOTTED SOCKET AND A TUBE ANTI SEIZE COMPOUND. MOST OF THE TIME NEW OXYGEN SENSOR ALREADY HAS ANTI SEIZE COMPOUND USED ON THE THREADS.TO REPLACE OXYGEN SENSOR FIRST CRANK VECHICLE FOR A FEW MINUTES SO YOU CAN REMOVE OXYGEN SENSOR MORE EASILY. ONCE YOU GET THE EXHAUST LITTLE WARM.YOU DISCONNECT OXYGEN SENSOR CONNECTOR TAKE SLOTTED SOCKET REMOVE OXYGEN SENSOR APPLY ANTI SEIZE ON OXYGEN SENSOR THREADS THE SCREW IT IN PLACE..WEAR LONG SLEEVES COVERALLS, SAFETY GLASSES KEEP RUST PARTICLES GETTING INTO YOUR EYES. AND LEATHER GLOVES KEEP HANDS FROM CUTS AND EXHAUST BURNS. IF YOU REPLACING DOWN STREAM OXYGEN SENSOR YOU HAVE TO RAISE VECHICLE SUPPORT ON JACKSTANDS. FOR UP STREAM OXYGEN SENSOR YOU CAN REPLACE WITHOUT RAISING THE VECHICLE.REASON I SAY CRANK ENGINE TO WARM UP EXHAUST SYSTEM BECAUSE METAL EXPANDS WHEN HOT THAT MAKES REMOVING OXYGEN SENSOR EASIER. IF YOU DONT CRANK VECHICLE THE COLD CAUSES METAL TO SHRINK MAKING HARDER TO REMOVE OXYGEN SENSOR.POSSIBLY DAMAGING SENSOR THREADS WHILE TRYING TO LOOSEN SENSOR FROM EXHAUST MANIFOLD OR PIPE. YOU CAN BUY SLOTTED SOCKET AND ANTI SEIZE COMPOUND AT ANY AUTO PARTS STORES.

WELL WHICH OXYGEN YOU REPLACING THE UPSTREAM OXYGEN SENSOR MOUNTED IN EXHAUST MANIFOLD AND THE DOWN STREAM OXYGEN SENSOR LOCATED IN THE EXHAUST SYSTEM AFTER THE CATALYTIC CONVERTER .YOU NEED A OXYGEN SENSOR SOCKET TO REMOVE IT.TO REMOVE OXYGEN SENSOR CRANK VECHICLE TO GET OXYGEN SENSOR HOT BECAUSE HARD TO REMOVE WHEN COLD.BECAREFUL DONT GET BURN ON EXHAUST MANIFOLD WHEN REMOVING OXYGEN SENSOR.AND WHEN INSTALLING NEW OXYGEN SENSOR USE ANTI SEIZE COMPOUND ON SENSOR THREADS.BUT MOST OF THE TIME NEW SENSOR WILL HAVE ANTI SEIZE COMPOUND ON IT.

Heated Oxygen Sensor (HO2S)- The Bank 1 Sensor 1 tells me that it's an upstream O2 sensor. The larger the number the further down the line of the exhaust it is. Removal & Installation 4.2L Engine
To Remove:

1. Raise and safely support vehicle.
2. Disconnect battery ground cable.
3. Detach electrical connector from right inner fender splash shield (if necessary).
4. Remove right inner fender splash shield (if necessary).
5. Disconnect heated oxygen sensor electrical connector.
6. Remove heated oxygen sensor.

To Install:

1. Apply anti-seize lubricant to heated oxygen sensor threads.
2. Install heated oxygen sensor. Torque to: 34 ft-lbs (46 Nm)
3. Connect heated oxygen sensor electrical connector.
4. Install right inner fender splash shield (if necessary).
5. Attach electrical connector to right inner fender splash shield (if necessary).
6. Connect battery ground cable.
7. Lower vehicle.

4.6L and 5.4L Engines
To Remove:

1. Raise and safely support vehicle.
2. Disconnect battery ground cable.
3. Disconnect heated oxygen sensor electrical connector.
4. Remove heated oxygen sensor.

To Install:

1. Apply anti-seize lubricant to heated oxygen sensor threads.
2. Install heated oxygen sensor. Torque to: 34 ft-lbs (46 Nm)
3. Connect heated oxygen sensor electrical connector.
4. Connect battery ground cable.
5. Lower vehicle.

UPSTREAM OXYGEN SENSOR
The oxygen sensor is installed in the exhaust manifold Upstream Heated Oxygen Sensor - 2.4L. or Upstream Heated Oxygen Sensor - 3.0L. or Upstream Heated Oxygen Sensor - 3.3/3.8L .

CAUTION: Do not pull on the oxygen sensor wire when unplugging the electrical connector.

WARNING: THE EXHAUST MANIFOLD AND CATALYTIC CONVERTER MAY BE EXTREMELY HOT. USE CARE WHEN SERVICING THE OXYGEN SENSOR.

REMOVAL
Raise and support vehicle.
Unplug oxygen sensor electrical connector.
Use a socket such as Snap-On YA8875 or equivalent to remove sensor.
When the sensor is removed, the exhaust manifold threads must be cleaned with an 18 mm X 1.5 + 6E tap. If using original sensor, coat the threads with Loctite 771-64 anti-seize compound or equivalent.
INSTALLATION
Reverse removal procedure to install a new sensor
New sensors are packaged with compound on the threads and no additional compound is required. The sensor must be tightened to 27 N·m (20 ft. lbs.) torque

you need to borrow the oxygen sensor wrench from autozone or whereever you bought the sensor. Section 03-14: Engine Controls, Electronic 1996 Taurus, Sable Workshop Manual REMOVAL AND INSTALLATION -------------------------------------------------------------------------------- Heated Oxygen Sensor (HO2S) SPECIAL SERVICE TOOL(S) REQUIRED Description Tool Number Oxygen Sensor Wrench T94P-9472-A Removal and Installation Disconnect battery ground cable (14301). Refer to Section 14-01 . On 3.0L (4V) engine remove cowl extension and right side of leaf screen. Disconnect engine control sensor wiring (12A581) from heated oxygen sensors (HO2S) (9F472). Do not remove harness connectors from the brackets. Raise vehicle on hoist. Refer to Section 00-02 . 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. 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).

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

1. Disconnect battery ground cable (14301). Refer to Section 14-01 .
   

1. On 3.0L (4V) engine remove cowl extension and right side of leaf screen.
   

1. Disconnect engine control sensor wiring (12A581) from heated oxygen sensors (HO2S) (9F472). Do not remove harness connectors from the brackets.
   

1. Raise vehicle on hoist. Refer to Section 00-02 .
   

1. 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.
   

1. 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
   
   
   

Heated Oxygen Sensor (HO2S) SPECIAL SERVICE TOOL(S) REQUIRED Description Tool Number Oxygen Sensor Wrench T94L-9472-A
Removal and Installation
NOTE: If excessive force is needed to remove heated oxygen sensor (HO2S) (9F472) , lubricate heated oxygen sensor with penetrating oil prior to removal.

1. Disconnect battery ground cable (14301) .

1. Disconnect heated oxygen sensors from engine control sensor wiring (12A581) .

1. Raise vehicle on hoist. Refer to Section 00-02 .

1. Remove heated oxygen sensors from dual converter Y pipe (5F250) using Oxygen Sensor Wrench T94L-9472-A.

1. To install, reverse Removal procedure. Tighten heated oxygen sensors to 36-46 Nm (26-34 lb-ft).