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Need to replace oxygen sensor - 2008 Acura Mdx

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Buy one at a parts store, go to a muffler shop and pay them 20 bucks to install your part.

Posted on Nov 08, 2010

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How do I replace an oxygen sensor (code 21) in a 1993 Toyota Camry?


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.

Sep 16, 2013 | Toyota 4Runner Cars & Trucks

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Which Oxygen Sensor Is It?


There are many inquiries online about which oxygen sensor to change. Oxygen sensor failure codes are very common on a lot of vehicles. With all of today's vehicles having at least two oxygen sensors and many having three or four of them, it can be a little confusing as to which one is causing the problem.

Before we get into which sensor is which, we need to have a little discussion about oxygen sensor fault codes. There are several different types of oxygen sensor fault codes. Here are just some of the most common ones:

P0135 "Oxygen Sensor Heater Circuit Bank1 Sensor 1"
P0141 "Oxygen Sensor Heater Circuit Bank 1 Sensor 2"
P0147 "Oxygen Sensor Circuit Bank 1 Sensor 3"
P0152 "Oxygen Sensor Voltage High Bank 2 Sensor 1"
P0159 "Oxygen Sensor Slow Response Bank 2 Sensor 2"
P0171 "Oxygen Sensor Lean Sensor 1 Bank 1"
P0172 "Oxygen Sensor Lean Sensor 1 Bank 2"
P0174 "Oxygen Sensor Rich Sensor 1 Bank 1"
P0175 "Oxygen Sensor Rich Sensor 1 Bank 2"

There are many more possible oxygen sensor codes, but I only listed these to make my point. Many times the oxygen sensor code is NOT caused by the oxygen sensor itself. "Lean" or "Rich" oxygen sensor codes (i.e. P0171, P0174) are usually caused by something other than the oxygen sensor. Something is wrong, causing the engine to run lean (not enough fuel or too much air) or causing the engine to run rich (too much fuel or not enough air). In these cases, replacing the oxygen sensor will not fix a thing. (That is, unless you are trying to fix your bank account from having too high of a balance!) The new oxygen sensor will just set the same code as the original one. This is because the oxygen sensor is not CAUSING the problem, it is only REPORTING the problem.

High voltage codes (like P0152 above) can be caused by the oxygen sensor wires being shorted to another wire inside the wiring harness. Sometimes these codes are caused by bad grounds where some other component is trying to ground through the oxygen sensor circuit. Again, replacing the oxygen sensor will not fix this! In short, the problem needs to be diagnosed before running out and buying an oxygen sensor.

Just because a fault code has "Oxygen Sensor" or "O2 Sensor" or "O2S" in its description does not necessarily mean that an oxygen sensor needs to be replaced. Many do-it-yourselfers believe that all there is to fixing the car is to hook it to the "magic box", collect the fault codes and replace the parts the computer tells you to replace. There is nothing further from the truth.

Fault codes only point you toward which SYSTEM is failing. The system must be diagnosed to find the CAUSE of the failure. If this is not done properly, it will only result in wasting a bunch of your money. This is what you were trying to avoid by doing it yourself!

So, after reading all of the above, if you think you still want to replace an oxygen sensor, but don't know which one; here is how to figure it out:

Oxygen sensors are always numbered like this:

Bank 1 Sensor 1
Bank 2 Sensor 1
Bank 1 Sensor 2
Bank 2 Sensor 2

Some manufacturers use a kind of shorthand that reads different, but means the same thing:

Sensor 1/1 or O2s 1/1
Sensor 2/1 or O2s 2/1
Sensor 1/2 or O2s 1/2
Sensor 2/2 or O2s 2/2

Bank 1 is always the side of the engine where cylinder #1 is located and, of course, Bank 2 is the opposite side.
On a 4 cylinder engine, there is only one bank and it is always referred to as Bank 1. The exception to the 4 cylinder rule is on certain 4 cylinder engines (specifically, some Toyotas) there are two catalytic converters used. In this case, Bank 1 sensors will still be in the pipe for the catalyst that is connected to cylinder #1 and Bank 2 sensors will be in the other one.

Sensor 1 is always the "upstream" sensor (the one located BEFORE the catalytic converter).
Sensor 2 is always the "downstream" sensor (the one that is located AFTER the catalytic converter).
Sensor 3 refers to the ONLY "downstream" sensor where there are two sensors before the catalyst and only one after the catalyst. On very few vehicles the reference to this reads "Bank 1 Sensor 3".

If you do not know where cylinder #1 is, then you need to get a diagram of the firing order for your engine. Just post a question on FixYa.com and make sure you give the YEAR, MAKE, MODEL, and ENGINE SIZE of your vehicle and one or more of our experts will be happy to tell you how to find cylinder #1.

- DTTECH
ASE Certified Master Automobile Technician


Also check out this article by dttech: What Else Could Be Wrong?

on Apr 29, 2011 | Ford F-150 Cars & Trucks

1 Answer

Code 21,43,and 42


You have two oxygen sensors but 21 is upstream sensor. This is the sensor between engine and catalytic converter. There is three possible problems that it could be.
1 oxygen sensor input voltage maintained above the normal operating range.
2 no signal at 02 2/1 sensor
3 oxygen sensor input voltage sustained above thenormal operating range. What all this means is you need to replace the sensor.
when getting the replacement this is your O2 2/1 sensor.

May 13, 2013 | 1996 Jeep Cherokee Country

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

    2 Answers

    I am a female trying to save some money, I would like to know if the 02 sensor something that I can replace


    Depends on how strong you are because these sensors are in the exhuast manifold and they are uasally rusted.You have to be careful not to cross thread them when you reinstall.

    Apr 09, 2011 | Mitsubishi Diamante Cars & Trucks

    1 Answer

    Need to replace oxygen sensor


    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.

    Dec 30, 2010 | 1998 Lexus ES 300

    1 Answer

    Have a oxygen sencor and dont know were to put it in at thanks....


    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.

    Dec 08, 2010 | 2002 Jaguar S-Type

    1 Answer

    My 2003 Kia Optima check engine light keeps coming on. I was told "Bank 1 Sensor 1" needs to be replaced. Where is Bank 1 Sensor 1?


    P0130 Oxygen Sensor Circuit Malfunction - Bank 1 Sensor 1.
    P0131 Oxygen Sensor Circuit Low Voltage - Bank 1 Sensor 1.
    P0132 Oxygen Sensor Circuit High Voltage - Bank 1 Sensor 1.
    P0133 Oxygen Sensor Circuit Slow Response - Bank 1 Sensor 1.
    P0134 Oxygen Sensor Circuit No Activity detected - Bank 1 Sensor 1.
    P0135 Oxygen Sensor Heater Circuit Malfunction - Bank 1 Sensor 1


    Jun 23, 2010 | 2003 Kia Optima

    1 Answer

    REPLACING OXYGEN SENSORS


      Remove the Oxygen Sensor
    1. Step 1 Start the engine and let it idle for four minutes to raise the exhaust system temperature. This will make removal of the oxygen sensor much easier and prevent damage to threads on the exhaust pipe.
    2. Step 2 Turn off the engine.
    3. Step 3 Detach the ground battery cable using a wrench.
    4. Step 4 Locate the oxygen sensor or sensors you need to replace. The sensors are threaded into the exhaust pipes before and after the catalytic converter. The oxygen sensor has a cylindrical body and the approximate size of a spark plugmag-glass_10x10.gif.
    5. Step 5 Raise the front of your vehicle using a floor jack and support it on two jack stands. This will help you gain access to the sensor or sensors if necessary. If you need to work under the vehicle, wear safety goggles.
    6. Step 6 Unplug the sensor electrical connector.
    7. Step 7 Unscrew the oxygen sensor using a box-end wrench or a ratchet and oxygen sensor socket.
    8. Step 8 Remove the sensor or sensors from the vehicle.
    9. Install the New Oxygen Sensor
    10. Step 1 Apply a light coat of electrically conductive anti-seize compound to the threads of the new oxygen sensor.
    11. Step 2 Thread the oxygen sensor into the exhaust pipe by hand first.
    12. Step 3 Finish tightening the sensor using the box-end wrench or ratchet and oxygen sensor socket.
    13. Step 4 Plug the sensor electrical connector.
    14. Step 5 Lower the vehicle.
    15. Step 6 Attach the ground, battery cable using the wren

    Jan 28, 2010 | 2002 Nissan Pathfinder

    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


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    May 02, 2009 | 1995 Mercury Sable

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