Question about 2001 BMW 325

1 Answer

If my car uses a 2-wire oxygen sensor can I use a 4-wire oxygen sensor?

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1 Answer

No & why would you

Use the internet to educate yourself

You use what the car was designed for,
you know that.

Four wire has 2 that are for the heater,
1 ground & 1 output

How would you put the 2 harness connectors
together

I don't think you thought that question out too well

Posted on May 28, 2011

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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

Tip

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

How many 02 sensor and how many wire each sensor


depending on the engine make
v8 and v6 have 2 oxygen sensors( O2S) , one after each cat converter with 2 wires and 2 heated oxygen sensors ( HO2S) in the exhaust manifold/ pipe before the cat converter with 4 wires each
6 cyl and 4 cyl engines have one oxygen sensor after that cat converter and one heated oxygen sensor before the cat converter

Mar 24, 2016 | Cars & Trucks

2 Answers

What is a H2Os that was mentioned in my answer.


Stands for Heated oxygen sensor. You will see it designated like this: HO2S. Later model cars use a heater circuit in the oxygen sensor to heat it up for quicker operation. This is why you see 4- wire oxygen sensors; a heating element in the sensor requires 2 more wires- a power wire to the element and a ground wire for it.

Jun 26, 2014 | Cars & Trucks

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

    Where Are The sensor Banks On The 2004 GC


    Grand Cherokee oxygen sensor locations for 4.0 and 4.7 engines

    510d5d9.jpg


    f8b5293.jpg


    Four wires (circuits) are used on each O2 sensor:

    • 12–volt feed circuit for the sensor heating element
    • Ground circuit for the heater element
    • Low-noise sensor return circuit to the PCM
    • Input circuit from the sensor back to the PCM to detect sensor operation

    O2S Sensor removal Never apply any type of grease to the oxygen sensor electrical connector, or attempt any soldering of the sensor wiring harness.
    WARNING: THE EXHAUST MANIFOLD, EXHAUST PIPES AND CATALYTIC CONVERTER(S) BECOME VERY HOT DURING ENGINE OPERATION. ALLOW ENGINE TO COOL BEFORE REMOVING OXYGEN SENSOR.
    1. Raise and support vehicle.
    2. Disconnect O2S pigtail harness from main wiring harness.
    3. If equipped, disconnect sensor wire harness mounting clips from engine or body.
    CAUTION: When disconnecting sensor electrical connector, do not pull directly on wire going into sensor.
    4. Remove O2S sensor with an oxygen sensor removal and installation tool.

    02S Sensor installation
    Threads of new oxygen sensors are factory coated with anti-seize compound to aid in removal. DO NOT add any additional anti-seize compound to threads of a new oxygen sensor.
    1. Install O2S sensor. Tighten to 22 ft. lbs. (30 N·m) torque.
    2. Connect O2S sensor wire connector to main wiring harness.
    3. If equipped, connect sensor wire harness mounting clips to engine or body. When Equipped: The O2S pigtail harness must be clipped and/or bolted back to their original positions on engine or body to prevent mechanical damage to wiring.


    Hope thats help (remember comment and rated this).

    Apr 29, 2010 | 2004 Jeep Grand Cherokee

    2 Answers

    Where is the O2 sensor located on the 2003 V6 All Wheel Santa Fe and how dificult is it to replace?


    Hyundai Santa Fe 2001-05
    Heated Oxygen Sensor (H02S): The sensors are located in the exhaust system. On some vehicles, one sensor is located up at the exhaust manifold(s) and the other sensor is located down at the catalytic converter. On other vehicles, both sensors are located down at the catalytic converter.

    d2217fa.jpg

    How to Replace an Oxygen Sensor
    Parts:
    1. Oxygen Sensor
    2. Oxygen Sensor

    Tools:
    1. 3/8 in. Drive Ratchet
    2. Multimeter
    3. Oxygen Sensor Socket
    4. Combination Wrench Set
    5. Crimp Tool
    6. Socket Set
    7. Scan Tool

    Steps:
    Step 1 * Park the vehicle on a level surface. Set the parking brake and open the hood.
    o Tip: Safety Tip:Always wear safety glasses when working on your vehicle. Wear other personal protective equipment (PPE) when necessary, for example latex gloves or safety shoes.
    o Tip: Always make sure the struts on the hood can fully support the weight of the hood so that it does not close on you while working. The use of a hood prop can securely hold it in place.

    Step 2 * With the engine off and cool, locate the defective oxygen sensor in the exhaust manifold or pipe. If necessary, lift the front of the vehicle and support it with jack stands.
    o Tip: Most vehicles have multiple oxygen sensors. How many sensors, depends on the model year and type of engine.

    Step 3 * Disconnect the wire connector at the defective oxygen sensor.

    Step 4 * Remove the oxygen sensor from the exhaust system.

    Step 5 * If you are installing a universal oxygen sensor, cut off the connector from the original sensor and splice the connector wires to the new oxygen sensor. Follow the manufacturer’s instructions supplied with the sensor.

    Step 6 * For threaded oxygen sensors, apply anti-seize compound to the threads and install the new sensor.

    Step 7 * For flange mounted oxygen sensors, install a new gasket and tighten the mounting bolts.

    Step 8 * Reattach the wire connector from the sensor.

    Step 9 * If necessary, connect the OBD I/II scanner and erase the fault code.

    Hope help with this (remember rated and commented this help) Good luck.

    Mar 01, 2010 | 2003 Hyundai Santa Fe

    1 Answer

    Having trouble with wiring of oxygen sensor


    there should be a paper inside the parts box that tells you how to rewire the after market sensor

    Jan 21, 2010 | 1997 Geo Metro

    1 Answer

    My 1997 dodge ram 1500 keeps dieing out on me when I take my foot


    At the shop we test the oxygen to determine which one is bad.
    1. Disconnect the the negative of the battery cable.
    2.Disconnect the wiring harness from the oxygen sensor.
    3. Remove the oxygen sensor.
    To install new oxygen sensor.
    1. clean the thread on the mount.
    2. install oxygen sensor.
    3. connect wiring harness
    4. connect battery cable.

    Mar 13, 2009 | 1997 Dodge Ram 1500 Club Cab

    1 Answer

    Oxygen sensor 2000 2 liter Tracker


    You have an heated Oxygen sensor. 2 of the wires heat up the sensor and keep it at a certain temperature, it is turned on and off by the computer. The other 2 are use to send a very low voltage reading back to the computer to tell the computer if the engine is running rich or lean. I don't have a diagram to tell you which wire does what but you can get a manual and that should give you the information that you need and tell you how to trouble shoot it to tell if the sensor is bad or not, you may want to look for a wire laying on the exhaust, I have found wires burnt and lay on the metal.

    Sep 08, 2008 | 2001 Chevrolet Tracker

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