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Finding the oxygen sensor

I need to find the oxygen sensor on my matrix

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Hello, there are two sensors, an air/ fuel ratio sensor and an oxygen sensor, the #1 or a/f sensor is in the exhaust manifold near the firewall, the #2 or oxygen sensor is behind the catalytic converter.

Posted on Mar 20, 2014

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Posted on Jan 02, 2017

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I have a 2009 oyota matrix turns over fine but wont start


code p 2238 refers to heated oxygen sensor(HO2S) 1 bank 1 positive current control --circuit low===causes --wiring short to ground --HO2S
also refers to oxygen sensor (O2) 1 bank 1 -positive current control --circuit ;ow==causes --wiring short to ground ---O2S
also refers to heated oxygen sensor 1 bank 1 ---implausible signal===causes --wiring short to positive, short to ground --HO2S---ECM
at this point I suggest changing the heated oxygen sensor in bank 1 exhaust before the cat converter using the specialist tool as the sensor wires are delicate and subject to easy damage

Feb 15, 2017 | 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

Where is bank 1 02 sensor located on 2003 Toyota matrix


Hello, there are two sensors, one is the air/fuel ratio sensor which is in the pipe between the exhaust manifold and the catalytic converter and the oxygen sensor which behind the cat converter in the exhaust pipe, The most common fault is the front sensor but it depends on what the diagnostic code number is to be more specific.

Dec 03, 2014 | 2003 Toyota Matrix

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

    1 Answer

    2007 Toyota Matrix XR Idling is rough most when engine still cold. I already change the 2 oxygen sensors , PCV valve , MAF sensor and exhaust gasket.any suggestions?


    Idling goes down it is about .8 and engine shake little.some times work excellentI replace spark plugs with new but it is same.any sugestions?

    Jan 20, 2013 | 2004 Toyota Matrix

    1 Answer

    Wher is the oxygen sensor 1984 cutlass supreme oxygen sensor


    check the exhaust, under the car, or if it's front wheel drive may be right on the front of the engine on the exhaust manifold.

    Jun 19, 2012 | Cars & Trucks

    1 Answer

    Where are the 02 sensors located on a chevy venture


    I have written a couple articles that cover subjects including oxygen sensors, oxygen sensor codes, and oxygen sensor locations. I recommend that you read these articles before pending your money on trying to replace any oxygen sensors. Click the links below to see the articles.

    What Else Could Be Wrong?

    Which Oxygen Sensor Is It?

    Apr 26, 2012 | 2003 Chevrolet Venture Passanger

    2 Answers

    How do you fix the oxygen sensor for 1996 ford explorer


    pctech1_31.jpg

    NOTE: If excessive force is needed to remove heated oxygen sensor, lubricate heated oxygen sensor with Penetrating Lubricant prior to removal.

    1. Disconnect battery ground cable.
    2. Disconnect heated oxygen sensor from engine control sensor extension wiring.
    3. On 3.0L, 4.0L and 5.0L raise and support vehicle.
    4. Remove heated oxygen sensors from exhaust manifold, inlet pipe, or dual converter Y pipe, using an Oxygen Sensor Wrench.
    Installation
    1. To install, reverse the removal procedure.
    2. Apply a light coat of anti-seize compound to thread.
    3. Tighten heated oxygen sensors to 36-46 Nm (27-33 lb-ft).

    Mar 06, 2011 | 1996 Ford Explorer

    1 Answer

    I have a 07 f150 4.6L V8 and I need to replace the Bank 1 sensor 1 oxygen sensor but cant figure out which sensor it is since there are 4 sensors. Where can I find a picture of the location?


    Heated Oxygen Sensor (HO2S)- The Bank 1 Sensor 1 tells me that it's an upstream O2 sensor. The larger the number the further down the line of the exhaust it is. Removal & Installation 4.2L Engine ford-04-42-2750.gif
    To Remove:
    1. Raise and safely support vehicle.
    2. Disconnect battery ground cable.
    3. Detach electrical connector from right inner fender splash shield (if necessary).
    4. Remove right inner fender splash shield (if necessary).
    5. Disconnect heated oxygen sensor electrical connector.
    6. Remove heated oxygen sensor.
    To Install:
    1. Apply anti-seize lubricant to heated oxygen sensor threads.
    2. Install heated oxygen sensor. Torque to: 34 ft-lbs (46 Nm)
    3. Connect heated oxygen sensor electrical connector.
    4. Install right inner fender splash shield (if necessary).
    5. Attach electrical connector to right inner fender splash shield (if necessary).
    6. Connect battery ground cable.
    7. Lower vehicle.
    4.6L and 5.4L Engines ford-04-46-2751.gif
    To Remove:
    1. Raise and safely support vehicle.
    2. Disconnect battery ground cable.
    3. Disconnect heated oxygen sensor electrical connector.
    4. Remove heated oxygen sensor.
    To Install:
    1. Apply anti-seize lubricant to heated oxygen sensor threads.
    2. Install heated oxygen sensor. Torque to: 34 ft-lbs (46 Nm)
    3. Connect heated oxygen sensor electrical connector.
    4. Connect battery ground cable.
    5. Lower vehicle.

    Nov 07, 2010 | Ford F-150 Cars & Trucks

    1 Answer

    Obd code 141


    DESCRIPTION
    The Engine Control Module (ECM) uses oxygen sensor signals to maintain the air fuel mixture at the ratio resulting in optimum fuel economy and reduced emissions. The amount of oxygen in the exhaust gases indicates, to the front oxygen sensor, whether the air fuel mixture being supplied to the engine cylinders is rich or lean. The readings of the rear oxygen sensor are used to indicate the efficiency of the catalytic converter. The ECM calculates catalytic convener efficiency by comparing the rear oxygen sensor signal to the front oxygen sensor signal.

    A normal oxygen sensor signal will constantly fluctuate above and below 500 mV , with the front oxygen sensor signal frequency of at least 5 Hz at 2500 RPM . Due to the effect of the catalytic converter, the rear oxygen sensor signal frequency will be lower than the front oxygen sensor signal frequency. If the rear oxygen sensor signal coincides with the front oxygen sensor signal a large percentage of the time, this indicates a loss in efficiency of the catalytic converter or a malfunction within the fuel system.

    FAILURE CONDITIONS
    After the engine runs for 2 minutes , the ECM checks the rear oxygen sensor heater circuit. If during two driving cycles the rear oxygen sensor's heater resistance is less than 4.6 Ohms or greater than 19.5 Ohms , the ECM will set P0141 and MIL will turn on. This code indicates an unusually high or low heater circuit resistance reading by the rear oxygen sensor or ECM.
    If you find this information to be helpful please give me a fixya! rating Thank you ,Randy
    If you need any further assistance please contact me by fixya or at fixincars@yahoo.com

    www.aceautomotive1.com

    Aug 18, 2008 | Hyundai Elantra Cars & Trucks

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