Question about 2003 Lexus SC 430

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Oxygen sensor i want to change oxygen sensor

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Its screwed into the exhaust before the catalytic convertor.Unplug the electrical plug and use ring spanner or appropriate socket to remove,easier and safer if cold.spray base of sensor a few hours before removal with crc.Nothing dificult about this job.Once replaced allow enough time for ECU to acknowledge and adapt to new sensor.

Posted on Nov 02, 2008

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What does the down stream oxygen sensor do


A downstream oxygen sensor in or behind the catalytic converter works exactly the same as an upstream O2 sensor in the exhaust manifold. The sensor produces a voltage that changes when the amount of unburned oxygen in the exhaust changes. ... The high or low voltage signal tells the PCM the fuel mixture is rich or lean.

Mar 09, 2017 | Cars & Trucks

1 Answer

Po136-o137 says change 02 sensor on bank 1 sensor2 I did but engine light is still on 2004 chevy tahoe


code p 0136 refers to heated oxygen sensor (HO2S) 2 bank 1 ---circuit malfunction===causes ---heating inoperative ---wiring---HO2S--- ECM
also refers to oxygen sensor (O2S0 2 bank 1---circuit malfunction===causes --- wiring---O2S ---ecm
it also refers to heated oxygen sensor (HO2S) 2 bank 1 ---no signal===causes ---wiring --- HO2S---
code p 0137 refers to HO2S 2 bank 1 ---low voltage -===causes --exhaust leak---wiring short to ground ---HO2S--- ECM
it also refers to O2S 2 bank 1---low voltage ===causes exhaust leak---wiring short to ground ---O2S ---ECM
to set you up here-- there are 4 oxygen sensors in the system
2 are heated oxygen sensors (HO2S) on in each exhaust manifold or exhaust pipe before the cat converter and
2 oxygen sensors (O2S) -- one in each exhaust pipe after the cat converters
heated oxygen sensors have 4 wires and O2S sensors normally only 2 wires
it is more that possible that you changed the wrong sensors and in the process damaged the delicate wires with the incorrect spanner being used

Jul 25, 2016 | 2004 Chevrolet Tahoe

1 Answer

How to change upstream o2 sensor on 2008 chevy uplander 3.9l ?


  • 1 Warm up the engine for about four minutes to bring it to operating temperature. Then turn off the engine. This will avoid damage to the exhaust pipe threads if that sensor has seized to the pipe.
  • 2 Find the oxygen sensor or sensors you need to replace. The upstream sensor is located near the exhaust manifold and the downstream sensor on the back exhaust pipe, close to the catalytic converter.
  • 3 Disconnect the oxygen sensor electrical connector. Depending on your particular Chevy model, both sensors may be disconnected from the engine compartment.
  • 4 Lift the front of your Chevy model to reach the sensor you need to change, if necessary. Use a floor jack and two jack stands to support it.
  • 5 Remove the oxygen sensor using a box-end wrench or a ratchet and oxygen-sensor socket.


  • Read more : http://www.ehow.com/how_5159092_replace-oxygen-sensor-chevy.html

    Jul 23, 2014 | Chevrolet Chevy Cars & Trucks

    2 Answers

    Check Engine light with Po131 o2 circuit low voltage sensor 1 bank 1 reading, what does that mean?


    - Front Heated Oxygen Sensor Bank 1 harness is open or shorted
    - Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
    - Faulty Front Heated Oxygen Sensor Bank 1
    - Inappropriate fuel pressure
    - Faulty fuel injectors
    - Intake air leaks may be faulty
    - Exhaust gas leaks

    Replacing the O2 Sensor 1 usually takes care of the problem

    The front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.

    Feb 07, 2012 | 2004 Honda Odyssey

    1 Answer

    How do you change o2 sencer on 1999 intrepid


    The 1999 Dodge Intrepid uses two oxygen sensors, one on each of the two exhaust manifolds. Determine which oxygen sensor is faulty before changing the sensors by having the computer in your Intrepid scanned for codes. Most major auto parts retailers will scan the computer free of charge on the hope that you will buy the parts needed from them. If you need to replace both of the oxygen sensors, the process is the same for both sides so you can just repeat it after the first one is complete.

  • 1

    Raise the front of your Intrepid with a jack and support the car with a set of jack stands positioned under the frame. Remove the jack from under the car and out of the way for now.

  • 2

    Locate the oxygen sensor from under the car. Looking up into the engine compartment--the sensor is on the outboard side of the exhaust manifold pointing out toward the fender. This location is the same for both oxygen sensors, just on opposite sides of the car.

  • 3

    Locate the wiring harness connector by following the wiring pigtail from the sensor down the wires until you see the connector. Lift the locking tab slightly on the connector and separate the two halves of the connector. Lay the wires aside and return to the oxygen sensor.

  • 4

    Turn the oxygen sensor counter-clockwise with an oxygen sensor socket and ratchet until it is loose, then remove it from the exhaust pipe. Discard the old sensor and thread the new oxygen sensor into the exhaust pipe by hand to start with. This will help avoid cross threading the sensor and exhaust pipe.

  • 5

    Tighten the oxygen sensor to 20 ft.lbs. with a torque wrench and oxygen sensor socket. Plug the wiring pigtail from the new sensor into the wiring harness connector on the car. Push the two halves together until the locking tab engages and the halves are secure.

  • 6

    Repeat the process for the other sensor if you are changing both. Raise the front of your Intrepid off the jack stands with a jack, remove the stands from under the car and lower the car to the ground.




  • Dec 06, 2011 | 1999 Dodge Intrepid

    1 Answer

    How do you change oxygen sensors on a 2000 hyundai sonata


    Locate the two oxygen sensors on either side of the Sonata's catalytic converter on the exhaust manifold. The Sonata's oxygen sensor is gold and shaped liked a spark plug.

  • 2 Remove the Sonata's wiring harness from the end of the two oxygen sensors using your fingers. Do not damage the end of Sonata's wiring harness.
  • 3 Remove the two oxygen sensors from the Sonata's manifold using the oxygen sensor wrench.
  • 4 Apply the anti-seize compound to the threads of the Sonata's two new oxygen sensors.
  • 5 Install the two new oxygen sensors to the Sonata's manifold using the oxygen sensor wrench. Re-attach the wiring harness to the two new oxygen sensors using your fingers.
  • Oct 31, 2011 | 2000 Hyundai Sonata

    1 Answer

    It will be very much appreciated if you could send me the information about how to replace the O2 sensors on a 1998 chrysler sebring convertible.


    Hello, Eventually your Chrysler Sebring's oxygen sensor will go bad and need to be replaced. The oxygen sensor regulates the oxygen-to-fuel ratio in your vehicle. It also controls your gas mileage. It senses when more or less oxygen needs to be pumped into the fuel lines. If it fails, your Sebring will run poorly and won't get very good gas mileage. Knowing how to change it yourself can save your money. Here are the instruction to change o2 sensors.
    Locate your Sebring's oxygen sensor on the pre-catalytic converter. This is located near the front right wheel well of your vehicle. Apply some anti-seize paste to the threads of the new oxygen sensor. Be careful not to get any of the paste on the sensor itself, or it will be ruined. This makes for easy removal of the sensor next time.Remove the old oxygen sensor, using the 7/8-inch wrench. Find the stock sensor wire near the engine-loop lift. This will be by the firewall of your Chrysler Sebring. Splice the stock sensor wire and connect it to the new oxygen sensor's wire, using crimp connectors.Remove the large air-intake pipe that runs from the air box to the rear turbo. Then remove the two smaller air pipes that run from the air box to the blowoff valves. This will give you access to the oxygen sensor. Soak the old oxygen sensor in WD-40 to loosen it. Screw in the sensor by hand. Use the wrench to fully tighten the oxygen sensor so it cannot be removed by hand. Replace the air pipes to the correct valves again.

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  • May 20, 2011 | 1998 Chrysler Sebring

    1 Answer

    Engine codes are 12, 51,21,53,55 can someone tell me what these codes are. engine is running extremely rich.


    12 is battery has been disconnected recently, or went dead.
    51 is Oxygen sensor stuck on lean mixture reading
    21- no change in oxygen sensor reading
    53- internal problem with logic module
    55- is end of message/codes.

    51 & 21, basically telling you same thing, but I wouldn't jump at changing oxygen sensor first, as a bad M.A.P. sensor can cause a rich mixture, thus oxygen sensor switches to lean to try and compensate. Personally, I'd go with map sensor first, check connections and vacuum lines if all good, replace it, then I'd go to oxygen sensor .

    Oct 21, 2010 | 1993 Dodge Caravan

    1 Answer

    P1176 2000 VW JETTA ALREADY CHANGED THE 02


    17584/P1176/004470 - Bank1: O2 (Lambda) Correction Behind Catalyst: Control Limit Reached Possible Causes
    • Intake Air System leaking
    • Oxygen Sensor(s) and/or Oxygen Sensor Control faulty
    Possible Solutions
    • Check Intake Air System for Leaks (False Air)
    • Check Oxygen Sensor(s) and/or Oxygen Sensor Control (all of them!)
    This is the pre 02 sensor located before the catalytic converter.

    May 10, 2010 | 2000 Volkswagen Jetta TDI

    1 Answer

    Check engine light


    P0041 Downstream Oxygen Sensors Swapped From Bank To Bank
    How does a P0041 code trigger the check engine light? This code will trigger the light to come on under the following condition:

    The Heated Oxygen Sensor Monitor, a strategy built into the computer, determines if the Heated Oxygen Sensor (HO2S) signal response for a change in fuel trim corresponds to the correct engine bank. If a response from the Oxygen Sensor being tested is not indicated, a trouble code will be set and the MIL (Malfunction Indicator Lamp) will illuminate.
    Possible Causes:
    Crossed Heated Oxygen Sensor harness connectors
    Wiring swapped from one Oxygen Sensor connector to the other
    Wiring changed at the computer connection or in the related harness

    Apr 09, 2009 | 1994 Honda Civic

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