Question about 1998 Buick Regal

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Remove oxygen sensor

How to remove oxygen sensor . Is there a special tool? I can get a wrench back there but can't enough leverage on it to remove. Ideas?

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There is no special tool needed, try spraying WD-40 on it to loosen it up, or try using a Breaker Bar or Pipe on the wrench for more leverage. It has received alot of heat there in its lifetime and could be very tight and could have welded itself to the bung. When you reinstall a new one put some Anti-Seize Compound on it so you won't have that problem next time.

Posted on Jun 03, 2010

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Yes, there is a special socket to fit the O2. You need to see if a short one or long will do the trick. All O2's are the same size(7/8"). Using a wratchet that swivels at the head will also probably help. Spray some PB Blaster on the threads and let soak a few minutes to make it easier to break it loose. Good luck.

Posted on Jun 03, 2010

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Letting the car run for 10 minutes helps as well.the heat generated from the exhaust expands the pipe making it easier to remove the sensor.just be carefull not to burn yourself.

Posted on Jul 30, 2012

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There is a special socket with a slot. I don't have one so I use an open end wrench. If that doesn't work, I use a vice grip. If you have line wrenches, those are best next to the special tool. Do you know which one you're going for? Here is the procedure from autozone.com:


REMOVAL & INSTALLATION WARNING
The oxygen sensors each use a permanently attached pigtail and connector. This pigtail should not be removed from the oxygen sensor. Damage or removal of the pigtail or connector could affect proper operation of the oxygen sensor.
NOTE Take care when handling an oxygen sensor. The in-line electrical connector and louvered end must be kept free of grease, dirt or other contaminants. Avoid using cleaning solvents of any type. DO NOT drop or roughly handle any oxygen sensor. GM says, "A dropped sensor is a bad sensor." A special anti-seize compound is used on the oxygen sensor threads. The compound consists of graphite suspended in fluid and glass beads. The graphite will burn away, but the glass beads will remain, hopefully making the sensor easier to remove. New or service sensors will already have the compound applied to the threads. If a sensor is removed from an engine and if for any reason is to be reinstalled, the threads must have anti-seize compound applied before reinstallation.

WARNING The heated oxygen sensor may be difficult to remove when the engine temperature is less than 120°F. Excessive force may damage the threads in the exhaust manifold or the exhaust pipe.

  1. Disconnect the negative battery cable.
  2. Raise and safely support the vehicle.
  3. If working on the HO2S 1, remove the intermediate exhaust pipe and the heat shield.
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Fig. Note this special socket with a cutaway slot to accommodate the oxygen sensor's wire harness (pigtail)

  1. Detach the electrical connector and carefully remove the oxygen sensor. Because the permanently attached pigtail may be difficult to work around, note that there are special wrench sockets made with the side removed to accommodate the pigtail.
To install:
  1. Coat the threads of the oxygen sensor with a suitable anti-seize compound, if necessary.
  2. Install the sensor and torque to 30 ft. lbs. (41 Nm).
  3. Install the remainder of the components in the reverse order of removal.
  4. Connect the negative battery cable.

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Oxygen sensor


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).

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How do you replace the oxygen sensors on a 1995 merc sable with a 3.0 ltr motor


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


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3 Answers

How to replace a 2002 buick rendezvous o2 sensor before CAT. Conv.


The O2 sersor will require a special socket to avoid damaging the wiring on the new unit. (the old one really doesn't matter so any socket that works can be used on it)
The first thing to do is spray a thread release agent like PB Blaster® around the threads. You should do it for several days between driving.
Call the auto parts stores to find one that has loaner tools. They will require a deposit until the socket is returned. It will look something like the picture. Yes you will need a socket wrench too.
WORKING UNDERNEATH THE VEHICLE, MAKE SURE ITS BLOCK UP SO IT CAN NOT FALL.
Some more information to consider from a forum

"You might want to take the O2 sensor you just replaced back and get two new ones. Some times new O2 sensors are defective, also when replaceing them I found it better to replace all of them at the same time for sometimes when replaceing only one the computer sometimes sends back false codes. Another thing is if you buy an after market O2 sensor the wires are just a little bit longer and can cause the computer to send back false codes. The best O2 sensors that I have found are the Boch Platinums designed for your vehicle."


bosch%2520oxygen%2520sensor%252013444.jpg 67696.jpg

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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).

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