Question about 1988 Oldsmobile Cutlass Ciera

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Do I need to drop the exhaust to get to the oxygen sensor? Or is there a special tool to reach it from the top of the engine? The sensor is at the back of the engine compartment. And I can't reach it.

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You should not have to completely remove the exhaust, but dropping the front of it will greatly help in changing the O2 sensor. There IS a special socket for removing / installing the sensor that is a must have to prevent damaging the wires on the new sensor. The old sensor may be difficult to remove, so I suggest some type of rust buster sprayed on before removal. Where you need to separate the exhaust depends on which O2 sensor you're changing - usually there are at least 2, an upstream and a downstream, separated by the catalytic converter.

Posted on Nov 05, 2010

  • John P Schwantes Jr Nov 05, 2010

    the sensers come out best if theengine has just been run to full operating temperture or heat the base of the senser with a map gas torch. where are several senser sockets and the one you need looks like a crows foot line wrench. If you take the exhaust down you may have torble with broken bolts and sealing up even if the bolts don't fail. I never disturb things that arn't on the work order as the added cost of fixing them is'nt something the customer signed up to pay for and you may end up doing a long hard job for free.

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  • Master
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Yes a standard oxagen senser tool will get it outwith out dropping anything. It looks like a crows foot line wreanch. and a crows foot line wreanch will work. it's 7/8 inch. sometimes you can put a closed end wrench7/8 over the connector and put the wrench on you may have to try the wrench may ways till you find a way that fits. Most of the time once the senser is loose it'll come out with your fingers.

Posted on Nov 05, 2010

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2 Answers

2009 honda civic xl failed smock test catalyst not ready


run fault codes and check for O2 sensor problems ( ones after the cat converter)
check replace the cat converter/s

Nov 12, 2017 | Honda Cars & Trucks

1 Answer

Location of oxygen sensor on 2004 blazer check engine light keeps coming on. Replaced sensor no change. At bank 1 sensor is not connected when tested.


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.

11_14_2011_1_39_03_pm.jpg

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.

11_14_2011_1_40_07_pm.jpg

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.

11_14_2011_1_37_39_pm.jpg

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

Oct 12, 2011 | Cars & Trucks

3 Answers

I am trying to locate the Oxygen Sensor on my 2003 Impala?


Chevrolet Impala comes equipped with two oxygen sensors, one on either side of the catalytic converter. Locating the sensors is as simple as crawling under the vehicle.

  1. Location
    • The bank 1, sensor 2 oxygen sensor is located downstream of the catalytic converter. To get to the sensor, crawl underneath the vehicle and trace the exhaust pipe until you reach the catalytic converter. Continue to follow the exhaust pipe until you reach the bank 1, sensor 2 oxygen sensor.

    Identification
    • You should be able to identify the oxygen sensor as a single wire about 3 to 6 inches long. The oxygen sensor is mounted to the exhaust pipe and should slightly protrude from the pipe.

    Function
    • The oxygen sensor is an important part of the vehicle exhaust system. The sensor tests the amount of air in the exhaust stream. It then sends this information to the engine control computer, which determines how much fuel is necessary to maintain a proper air-to-fuel ratio.


If this free advice was helpful, a vote with the thumbs up would be greatly appreciated.
Thanks

Aug 25, 2011 | 2006 Chevrolet Impala

1 Answer

O2 sensor how to change it out


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.
9a007ee.gif

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.

Oct 18, 2010 | 2000 Buick Century

1 Answer

I have a 2005 GMC Savana G3500 and I need to know how many O2 sensors there are and where they are. Can anyone help?


Oxygen Sensor
Removal & Installation
CAUTION
The oxygen sensor 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 oxygen
sensor.
The oxygen sensor may be difficult to remove when the engine
temperature is less than 48°C (120°F)

NOTE: Removal of the oxygen sensor is
easier when the engine temperature is above 48°C (120°F).

Upstream HO2S Sensor
To Remove:


  1. Before servicing the vehicle refer to the Cautions and
    Warnings at the beginning of this section.
  2. Raise and safely support the vehicle.
  3. Remove or disconnect the following:

    • Electrical harness connector (A) from the HO2 S.
    • Remove the HO2 S (B) using special service tool
      J39194-B.





gm_exp_oxy_snsr_upstrm.gif

To Install:

CAUTION
GM uses a special anti-seize compound on the
HO2S threads. The compound consists of liquid graphite and glass
beads. The graphite tends to burn away but the glass beads remain easing sensor
removal. New or service replacement sensors have the anti-seize compound already
applied to the threads. If the sensor is removed from an exhaust component and
if for any reason the sensor is to be reinstalled the threads must have
anti-seize compound applied before installation.


  1. Coat the HO2 S threads with GM P/N 5613695
    high-temperature anti-seize compound as needed.
  2. Install the HO2 S using special service tool
    J39194-B;

    • Torque to 31 ft-lbs (42 Nm).

  3. Connect the HO2 S electrical harness connector.
  4. Lower the vehicle to the ground.

Downstream HO2S Sensor
To Remove:


  1. Before servicing the vehicle refer to the Cautions and
    Warnings at the beginning of this section.
  2. Raise and safely support the vehicle.
  3. Remove or disconnect the following:

    • Electrical harness connector (A) from the HO2S.
    • Remove the HO2 S (B) using special service tool
      J39194-B.





gm_exp_oxy_snsr_dwnstrm.gif

To Install:

CAUTION
GM uses a special anti-seize compound on the
HO2S threads. The compound consists of liquid graphite and glass
beads. The graphite tends to burn away but the glass beads remain easing sensor
removal. New or service replacement sensors have the anti-seize compound already
applied to the threads. If the sensor is removed from an exhaust component and
if for any reason the sensor is to be reinstalled the threads must have
anti-seize compound applied before installation.


  1. Coat the HO2 S threads with GM P/N 5613695
    high-temperature anti-seize compound as needed.
  2. Install the HO2 S using special service tool
    J39194-B;

    • Torque to 31 ft-lbs (42 Nm).

  3. Connect the HO2 S electrical harness connector.
  4. Lower the vehicle to the ground.

Sep 23, 2010 | 2005 GMC Savana

2 Answers

How do I replace a oxygen sensor on a 1985 montycarlo 4.5 V6


Spend the few bucks on the correct socket from an auto parts store. It looks like a spark plug socket with a slice down the side.

You'll also want to get a certain type of grease when you install it.

Basically, you do this:

Removal & Installation

The oxygen sensor must be replaced every 30,000 miles (48,000 km.). The sensor may be difficult to remove when the engine temperature is below 120°F (48°C). Excessive removal force may damage the threads in the exhaust manifold or pipe so follow the removal procedure carefully.
  1. Disconnect the negative battery cable.
  2. Locate the oxygen sensor. On the V8 engines, it is normally on the front of the left side exhaust manifold, just above the point where it connects to the exhaust pipe. On the V6 engines, it is on the inside of the exhaust pipe where it bends toward the back of the car.
On the V6 engine you may find it necessary to raise the front of the car and remove the oxygen sensor from underneath.


dca2fab.gif
Oxygen sensor location and installation

  1. Trace the wires leading from the oxygen sensor back to the first connector and then disengage the sensor harness connector (the connector on the V6 engine is attached to a bracket mounted on the right, rear of the engine block, while the connector in the V8 engine is attached to a bracket mounted on the top of the left side exhaust manifold).
The sensor may be extremely difficult to remove when engine temperature is below 120°F (48°C). Be careful as excessive force could damage threads in the exhaust manifold or pipe.
  1. Using a special sensor tool or a socket, loosen the sensor, then carefully unthread and remove it from the engine. If sensor removal is difficult, spray a small amount of commercial heat riser solvent onto the sensor threads and allow it to soak in for at least five minutes, then attempt to loosen and remove the sensor again.

CAUTION Avoid using cleaning solvents of any type on the oxygen sensor. Keep the louvered end free of grease, dirt or other contaminants. Do not drop or roughly handle the sensor. If any of these cautions are ignored, the sensor could be damaged resulting in poor engine performance and excessive exhaust emissions.


To install:
  1. New oxygen sensors will be packaged with an anti-seize lubricant already applied to the threads. If a sensor is removed from the exhaust and is to be reinstalled for any reason, the sensor threads must be coated with a fresh anti-seize compound. Use G.M. anti-seize compound No. 5613695 or the equivalent. This is not a conventional anti-seize paste. The use of a regular compound may electrically insulate the sensor, rendering it inoperative. You must coat the threads with an electrically conductive anti-seize compound.
  2. Carefully thread the sensor into the exhaust bore, then tighten to 30 ft. lbs. (41 Nm) using a torque wrench.
  3. Engage the sensor harness.
  4. Connect the negative battery cable, then start and run the engine to check for proper operation.

Feb 13, 2010 | 1985 Chevrolet Monte Carlo

1 Answer

Change oxygen sensor


Under hood, center, front engine area, above exhaust pipe flange, mounted in exhaust manifold
Application:
Front
Under hood, center, rear engine area, above exhaust pipe flange, mounted in exhaust manifold
Application:
Rear

The oxygen sensor may be difficult to remove when the engine temperature is below 120°F (48°C). Excessive force may damage the threads in the exhaust manifold of exhaust pipe.
  1. Start the engine and let it warm up to 120°F (48°C), stop the engine and disconnect the negative battery cable.
  2. Detach the electrical connector from the oxygen sensor.
  3. Using a special, oxygen sensor socket, remove the oxygen sensor from the exhaust manifold or exhaust pipe.


NOTE A special anti-seize compound is used on the oxygen sensor threads. The compound consists of liquid graphite and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will already have the compound applied to the threads. If an oxygen sensor is removed from the engine and if for any reason, it is to be reinstalled, the threads must have this anti-seize compound applied before installation.
  1. Coat the threads of the oxygen sensor with anti-seize compound 5613695 or equivalent.
  2. Install the sensor and tighten it to 30 ft. lbs. (40 Nm).
  3. Reattach the electrical connector to the sensor and the negative battery cable.



0900c1528025ed0c.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Location of the rear O2 sensor


0900c1528025ed0d.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Location of the the front O2 sensor


0900c1528025ed0e.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Use a wrench or special socket to loosen the O2 sensor


0900c1528025ed0f.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. When replacing or reinstalling an oxygen sensor, be sure to lube the threads sufficiently

Jan 19, 2010 | 1992 Cadillac DeVille

1 Answer

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).

Jun 13, 2009 | 1996 Ford Taurus

1 Answer

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


4da449b.gif

May 02, 2009 | 1995 Mercury Sable

1 Answer

O2 Sensor on a 1996 Cadillac Eldorado


Hello mrsalbert, my name is JShreader. Thank you for choosing fixya.com

Depending on which oxygen sensor you are looking for...there are several of them throughout the Exhaust System. I will start out by giving you a brief description of what and oxygen sensor is, and they're general purpose.

DESCRIPTION
Four Heated Oxygen Sensors (HO2S) are mounted in the exhaust system where they monitor the oxygen content in the exhaust stream. There is an oxygen sensor mounted in each exhaust manifold and one on each end of the catalytic converter. the oxygen sensor located in the front exhaust manifold is the Bank 2 Sensor 1 (Front) sensor. The oxygen sensor located in the rear exhaust manifold is the Bank 1 Sensor 1 (Rear) sensor. The oxygen sensor located in the Y-pipe ahead of the catalytic converter is the Bank 1 Sensor 2 (Pre-converter) sensor. The oxygen sensor located in the catalytic converter outlet is the Bank 1 Sensor 3 (Post-converter) sensor.

OPERATION
An oxygen sensor acts like a battery because it creates its own signal voltage once it reaches operating temperature. This voltage is produced when the oxygen content in the exhaust stream is different than the oxygen content in the atmosphere. A lean condition (high oxygen content in exhaust) will produce a low voltage (near 0 volts) and a rich condition (low oxygen content in exhaust) will produce a high voltage (near one volt). The PCM provides a reference signal voltage (0.45 volt) and a ground to the sensor. The PCM reference voltage is necessary because the oxygen sensors do not provide their own voltage until they reach operating temperature.

HEATING ELEMENT
the oxygen sensors also incorporate a heating element inside of the sensor housing. This heating element is energized with the ignition On and allows the sensors to reach operating temperatures quickly. The PCM can then use oxygen sensor information sooner after engine start-up.

PCM INPUTS
The PCM uses oxygen sensor information during Closed Loop operation to constantly adjust fuel control to reduce exhaust emissions. Because the oxygen sensors provide information sooner after engine start-up, exhaust emissions are reduced. Faulty oxygen sensors will cause various driveability conditions and will set a DTC.

That being said...I uploaded a .pdf for you of pictures showing the locations of ALL the oxygen Sensors on your Vehicle. You can download it by clicking HERE.

I hope this helps you. If you have any more questions or need any more diagrams, please don't hesitate to ask...Thanks again, JShreader!

Apr 01, 2009 | 1996 Cadillac Eldorado

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