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O2 sensor replacement - 1992 Chevrolet Caprice

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The sensor is located on the exhaust manifold on the drivers side of the engine compartment... approximately straight down from where you put the oil in. It's a mother to get to. I had the most luck from the top. Get a special O2 sensor socket from Autozone or Advance. This looks like a normal socket but has the side cut out to make room for the wire that comes out of the sensor. Since the old sensor is rusted in there it helps if you let the engine warm up first so that the sensor and threads are nice and hot. Turn off the car. You'll probably have to get under the car to unplug the connector comming from the sensor. Now stick the socket on the sensor, an extension, and a socket wrench and just pray to God that that thing will turn. After cursing at it for a solid hour it will eventually break free and you'll be able to turn it about 5 degrees at a time before your ractchet will hit something in the engine compartment. After you've got it out, carefully start threading the new one in. Make sure you don't get any of the "never-seze" grease that are on the threads of the new one on the head of the sensor. That stuff will ruin the sensor and you'll have to repeat this whole procedure over again. OK, screw the sensor in till it's tight, reconnect the wire and you're good to go!

Posted on Jan 24, 2009

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How many o2 sensore are on the 99 bravado? I replaced the o2 sensor before the cat converter, now code says bank one( before cat.) needs replacing. are there 4?


the sensor before the cat is NOT an O2 sensor but a HO2S sensor ( two different sensors with different operations). If this is a V6 engine there are 4 sensors -- 2 --HO2S sensors before the cats --one for each bank cat and 2 O2 sensors after the cats.
The fault code would have spelt out the correct sensor for replacing

Jan 24, 2015 | 1999 Oldsmobile Bravada

Tip

How to Replace the O2 Sensor in Mercury villager?


O2 sensor needs to be replaced when you get low gas mileage in car.
The procedure to replace is as follows: ----
1) There is primary and secondary O2 sensor connector.
2) Do the replacement of the O2 sensor only when the engine is completely cool.
3)You will see primary O2 sensor on the exhaust manifold.The secondary O2 sensor is located after the catalytic converter.
4)Put the car on jack stands on the rack, this will give you proper sensor location in the car.
5)Remove the O2 sensor with a socket wrench and O2 removal tool extension. Turn the O2 sensor counterclockwise to remove.
6) Most of the times the O2 sensor comes out very easily but if its bit hard to remove it then you can use "FREEZE spray" to make it gets loose.
7)The spray will make it come out easily.
8)When the O2 sensor is getting removed, some of the wiring's will also come out.
9)Before removing the O2 sensor, take the note of the wiring's and the position of wiring so while inserting new O2 sensor you don't get confused.
10) Now after you remove the old faulty O2 sensor out. Carefully insert new O2 sensor in same position.
11) And reverse/refit all the wires / parts which you removed while replacing the old O2 sensor.
This will help. Thanks.

on Mar 22, 2010 | Mercury Villager Cars & Trucks

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How to Replace the O2 Sensor in a Buick Century Car?


O2 sensor needs to be replaced when you get low gas mileage in car.
The procedure to replace is as follows: ----
1) The oxygen sensor is located under the car.
2) Put the car on jack stands on the rack, this will give you proper sensor location in the car.
3) The sensor has to be turned a bit then it can be easily removed.
4) Most of the times the O2 sensor comes out very easily but if its bit hard to remove it then you can use "FREEZE spray" to make it gets loose.
5) The spray will make it come out easily.
6) When the O2 sensor is getting removed, some of the wiring's will also come out.
7) Before removing the O2 sensor, take the note of the wiring's and the position of wiring so while inserting new O2 sensor you don't get confused.
8) Now after you remove the old faulty O2 sensor out. Carefully insert new O2 sensor in same position.
9) And reverse/refit all the wires / parts which you removed while replacing the old O2 sensor.
This will help. Thanks.

on Mar 22, 2010 | Buick Century Cars & Trucks

1 Answer

What does a o2 sensor look like


Heated Oxygen Sensor

Print


Removal & Installation

3.5L

WARNING When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.

  1. Disconnect the negative battery cable.
  2. Disconnect the heated oxygen sensor electrical connector.
  3. Use a socket such as a crowfoot wrench to remove oxygen sensor.

To Install:

NOTE When replacing an O2 Sensor, the PCM RAM memory must be cleared, either by disconnecting the PCM C-1 connector or momentarily disconnecting the Battery negative terminal. The NGC learns the characteristics of each O2 heater element and these old values should be cleared when installing a new O2 sensor. The customer may experience driveability issues if this is not performed.
  1. After removing the sensor, the threads must be cleaned with an 18 mm X 1.5 + 6E tap. If reusing the original sensor, coat the sensor threads with an anti-seize compound such as Loctite 771- 64 or equivalent. New sensors have compound on the threads and do not require an additional coating. Tighten the sensor to 28 Nm (20 ft. lbs.) torque.
  2. Connect the heated oxygen sensor electrical connector.
  3. Install the wiring clip to the heat shield.
  4. Connect the negative battery cable.

    0996b43f80202384.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig.


3.8L Downstream Sensor

WARNING When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.
  1. Disconnect negative battery cable.
  2. Raise and support vehicle.
  3. Disconnect the electrical connector.
  4. Use a socket such as a crowfoot wrench to remove oxygen sensor.

3.8L Upstream & Downstream Sensors

NOTE When replacing an O2 Sensor, the PCM RAM memory must be cleared, either by disconnecting the PCM C-1 connector or momentarily disconnecting the Battery negative terminal. The NGC learns the characteristics of each O2 heater element and these old values should be cleared when installing a new O2 sensor. The customer may experience driveability issues if this is not performed.
  1. After removing the sensor, the threads must be cleaned with an 18 mm X 1.5 + 6E tap. If reusing the original sensor, coat the sensor threads with an anti-seize compound such as Loctite 771- 64 or equivalent. New sensors have compound on the threads and do not require an additional coating. Tighten the sensor to 28 Nm (20 ft. lbs.) torque.
  2. Connect the heated oxygen sensor electrical connector.
  3. Connect the negative battery cable.

3.8L Upstream Sensor

WARNING When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.
  1. Disconnect negative battery cable.
  2. Disconnect the upper O2 sensor connector.
  3. Use a socket such as a crowfoot wrench to remove oxygen sensor.

    0996b43f80202385.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig.


    0996b43f80202386.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig.


To Install:


Testing


NOTE Allow the O2 Sensor to cool down before conducting the test. The O2 Sensor voltage should stabilize at 5.0 volts. Raising the hood may help in reducing under hood temps quicker.

  1. Turn the ignition on, engine not running. With the scan tool, actuate the O2 Heater Test.
  2. With the scan tool, monitor O2 Sensor voltage for at least 2 minutes. Does the O2 Sensor voltage stay above 4.5 volts- If so, sensor is normal.
  3. If voltage does not stay above 4.5v as indicated, check wiring and connectors. Check O2 sensor for contamination.
  4. If wiring from the O2 sensor is damaged, DO NOT repair it; replace the O2 sensor.
  5. Turn the ignition off. Allow the O2 sensor to cool down to room temperature.
  6. Disconnect the O2 Sensor harness connector.
  7. Measure the resistance across the O2 Sensor Heater element component side. Resistance for either O2 Sensor should be 2.1-2.7 ohms.
  8. If the O2 Sensor is not within range, turn the ignition off.
  9. Disconnect the O2 Sensor harness connector. Turn the ignition to ON; engine not running.
  10. With the proper scan tool, actuate the O2 Heater Test.
  11. Using a 12-volt test light connected to ground, probe the O2 Heater Control circuit in the O2 Sensor harness connector.
  12. If the test light illuminates brightly and flashes on and off, replace the O2 Sensor.
  13. Confirm the repair with the appropriate Verification Test.
  14. Turn the ignition off.
  15. Disconnect the O2 Sensor harness connector.
  16. Disconnect the PCM harness connector.
  17. Measure the resistance between ground and the O2 Heater Control circuit in the O2 Sensor harness connector.
  18. Is the resistance below 5.0 ohms- If yes, repair the short to ground in the O2 Sensor Heater Control circuit. If resistance is okay, go to step 20.
  19. Confirm the repair.
  20. If resistance was okay when measured in step 17, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  21. If the resistance is still not within specified range, replace and program the Powertrain Control Module in accordance with the service information.
  22. Confirm the repair.

Jul 13, 2012 | 2004 Chrysler Pacifica

1 Answer

Engine light came on. checked for codes, 1129 appeared. can't find the code anywhere. prior to this code, replaced O2 sensor and transmisson was rebuilt . trans was done first and then code 300 came up....



Jeep code 1129:



Possible Causes

  • RESTRICTED FUEL SUPPLY LINE
  • FUEL PUMP INLET STRAINER PLUGGED
  • FUEL PUMP MODULE
  • O2 SIGNAL CIRCUIT
  • O2 RETURN CIRCUIT
  • O2 SENSOR HEATER OPERATION
  • O2 SENSOR
  • MAP SENSOR OPERATION
  • ECT SENSOR OPERATION
  • ENGINE MECHANICAL PROBLEM
  • FUEL FILTER/PRESSURE REGULATOR (HIGH)
  • PCM

Mar 02, 2011 | Jeep Grand Cherokee Cars & Trucks

Tip

How to Replace the O2 Sensor in a Audi All road Car?


O2 sensor needs to be replaced when you get low gas mileage in car.
The procedure to replace is as follows: ----
1) The oxygen sensor is located under the car.
2) Put the car on jack stands on the rack, this will give you proper sensor location in the car.
3) The sensor has to be turned a bit then it can be easily removed.
4) Most of the times the O2 sensor comes out very easily but if its bit hard to remove it then you can use "FREEZE spray" to make it gets loose.
5) The spray will make it come out easily.
6) When the O2 sensor is getting removed, some of the wiring's will also come out.
7) Before removing the O2 sensor, take the note of the wiring's and the position of wiring so while inserting new O2 sensor you don't get confused.
8) Now after you remove the old faulty O2 sensor out. Carefully insert new O2 sensor in same position.
9) And reverse/refit all the wires / parts which you removed while replacing the old O2 sensor.
This will help. Thanks.

on Mar 22, 2010 | Audi AllRoad Cars & Trucks

Tip

How to Replace the O2 Sensor in a Chevrolet Cavalier Car?


O2 sensor needs to be replaced when you get low gas mileage in car.
The procedure to replace is as follows: ----
1) The oxygen sensor is located under the car.
2) Put the car on jack stands on the rack, this will give you proper sensor location in the car.
3) The sensor has to be turned a bit then it can be easily removed.
4) Most of the times the O2 sensor comes out very easily but if its bit hard to remove it then you can use "FREEZE spray" to make it gets loose.
5) The spray will make it come out easily.
6) When the O2 sensor is getting removed, some of the wiring's will also come out.
7) Before removing the O2 sensor, take the note of the wiring's and the position of wiring so while inserting new O2 sensor you don't get confused.
8) Now after you remove the old faulty O2 sensor out. Carefully insert new O2 sensor in same position.
9) And reverse/refit all the wires / parts which you removed while replacing the old O2 sensor.
This will help. Thanks.

on Mar 22, 2010 | Chevrolet Cavalier Cars & Trucks

5 Answers

My Service Engine Soon light came on about a year ago. I took it into the shop and got that problem fixed but the light stayed on, so I took it to advance auto parts and code tested it and it said that...


There are several types of O2 Sensor codes. There can be "Lean O2 Sensor" codes, "Rich O2 Sensor" codes, "O2 Sensor Slow Response" codes, or "O2sensor Heater Circuit" codes. The specific code that is being set changes the way you must go about diagnosing and repairing the problem. I will say however, that in about 80% of all the O2 Sensor code problems that I have had to diagnose, the O2 Sensor itself was NOT the problem. The O2 Sensor was only reporting a problem that was actually caused elsewhere. O2 Sensors are the final checkpoint in the engine management system. I think of them like a report card. If the O2 Sensors are right, the rest of the engine management system is right. If the O2 Sensors are not right, the rest of the engine management system is probably not right. (Except in the 20% of the cases where the problem is actually being caused by a failed O2 Sensor)

Dec 04, 2010 | Mitsubishi Galant Cars & Trucks

1 Answer

Oxygen sensor replacement


It's something you can with simple tools, you have four O2 sensors. Your going to have to get the truck rescanned or if you have the DTC code, you can find out which O2 sensor has gone bad so you can replace it. Your going to have Two upstream O2 sensors on each exhaust bank, one O2 sensor before the Catalytic Converter, and the last one after the Catalytic Converter. Its like replacing a Spark plug and you can pick up the O2 sensor at any large Auto Parts store with a can of WD 40. Just unclip the wire leads to the O2 sensor and then with a O2 sensor socket or hint close end wrench and hammer, you can remove the O2 sensor from the exhaust pipe. Good luck and be safe.

Nov 22, 2009 | 2004 Chevrolet Silverado 2500HD

2 Answers

96 Dodge Neon O2 sensor Ckt No Activity bank 1 sensor 1----how do I replace the sensor, will that correct a problem with the check engine light?


That would correct the problem, the O2 sensor is on the exhaust manifold or on the exhaust manifold down pipe. If you go to Auto Zone, they will have the O2 sensor you need and also the loaner tool you may need to remove the O2 sensor. Auto Zone also can give you the step by step instructions to replacing the O2 sensor in about 30 min. Once you located the O2 sensor, disconnect the wire harness and use the O2 sensor socket to remove the sensor from the exhaust. It's like removing a spark plug, to install the new O2 sensor is just to follow the same procedure in revers to the removal. Good luck.

Oct 28, 2009 | 1996 Dodge Neon

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