Question about 1998 Ford Windstar

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Oxygen sensor what does the vehicle do when the oxygen sensor need to be replaced?

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Seem be be having to add power steering fluid every few days. Is the power steering pump going.

Posted on Nov 25, 2008

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You will start to see a reduction in fuel millage.
and your check engine will light and set a code

Posted on Nov 14, 2008


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Oxygen Sensors are coding, and need to be replaced. Is there somewhere other than Google that can give me an accurate Location of where on this Engine the Upstream, and Downstream are?

The up stream O2 sensor is on the back side of the engine in the exhaust manifold ! The down stream O2 sensor is under the vehicle after the catalytic converter ! What code P0xxx what . Just because it has an O2 sensor code doesn't mean the sensors are bad . Should check wiring , signal wire to PCM an Ground .

Heated Oxygen Sensor Replacement - Sensor 2

Tools Required

J 39194 Oxygen Sensor Wrench

Removal Procedure

  1. Turn OFF the ignition.

  2. Caution: To avoid any vehicle damage, serious personal injury or death when major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed and strap the vehicle to the hoist.

  3. Raise and support the vehicle.

Remove the splash shield (3). Disconnect the electrical connector retaining tab (1) from the heated oxygen sensor (HO2S) electrical connector (2). Disconnect the oxygen sensor connector (4) from the HO2S electrical connector (2).

Important: The HO2S may be difficult to remove when engine temperature is below 48?°C (120?°F). Excessive force may damage threads in exhaust manifold or exhaust pipe.

Use the J 39194 in order to remove the oxygen sensor (4) from the exhaust pipe .

Heated Oxygen Sensor Replacement - Sensor 1

Notice: The Heated Oxygen Sensor (HO2S) and the Oxygen Sensor use a permanently attached pigtail and connector. Do not remove this pigtail from the Heated Oxygen Sensor. Damage or the removal of the pigtail or the connector could affect the proper operation of the sensor.

Take care when handling the HO2S and the O2S. Keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Also avoid using cleaning solvents of any type. Do not drop the HO2S or the O2S. Do not roughly handle the HO2S or the O2S.

Removal Procedure

  1. Remove the fuel injection sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical .

  2. Turn OFF the ignition switch.

  3. Remove the HO2S retaining clip from the bracket.

  4. Disconnect the HO2S electrical connector tab from the HO2S 1 retaining clip .

  5. Remove the HO2S electrical connector retainer.

  6. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

Sep 21, 2015 | 2001 Buick LeSabre


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 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.

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

P0421 code

"FWIW, according to the Mazda factory service manual, the P0421 code indicates "Warm up catalyst system efficiency below threshold".

The DETECTION CONDITION for this code indicates "Number of heated oxygen sensor (rear) inversion becomes closer to that of heated oxygen sensor (front)".


Warm up three way catalytic converter deterioration
Leakage exhaust system
Heated oxygen sensor (front) malfunction
Heated oxygen sensor (rear) malfunction
Mass air flow sensor malfunction
Throttle position sensor malfunction
Vehicle speed sensor malfunction"
I copied the above from a discussion group on the PO421 code. The code can be caused by any of the above listed problems. The vehicle should be further inspected and diagnosed, so you do not have components replaced that do not need to be replaced.

Apr 16, 2014 | 1998 Mazda 626

1 Answer

What does the oxygen sensors look like in a 2003 Chevy Venture (warner Brothers Edition) ? How many are there? Where are they located? Can you show a picture of them in place? How do i replace them? Chevy...

There should be an O2 sensor before and after the catalytic converter on your vehicle, so it will have 2 sensors. You'll need a 7/8" open end wrench or an O2 sensor socket to replace them.

It'll look something like this:

May 20, 2011 | 2003 Chevrolet Venture Passanger

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

How do you replace the oxygen sensors

Mostly with any vehicle, they are mounted on the exhaust manifold, or just below it on the exaust pipes. if it`s a V6-V8, there will be one on each side of the engines exaust pipe before the 2 pipes Y together. Then one before the catalytic converter and one after.

I would take it to a auto parts store and get them to scan your check engine OBD II memory for code errors, before spending money. They should pin pint which Oxygen Sensor it is.

To replace, let vehicle cool down enough for the exaust not to be hot. With the vehicle in park, emergency brake on and wheel blocks. Then you can unhook the negative battery cable, Jack up the vehicle enough to reach the Oxygen sensors, always use jack stands for safety. Then find the Oxygen sensor your going to replace. Unhook the electrical connection and the plastic connection to the frame, then remove the old Oxygen sensor. (New ones will have grey anti-sieze on the threads) Screw in the new Oxygen sensor, don`t over tighten, just snug it up like you would a spark plug, the heat will do the rest. Then hook up your electrical connection and secure it to the frame. Making sure your new oxygen sensor wire is not touching the exaust pipe. Then rehook up your negative battery cable.

Things you need- 7/8inch wrench, penetrating oil to losen stuck oxygen sensors, safety glasses

Feb 26, 2011 | 2001 Ford Explorer Sport

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

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.


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

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

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


    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

2 Answers

Check engine light is on

Typically most vehicles will have to oxygen sensors. The job of the oxygen sensor is to measure the oxygen going into the intake and measure the oxygen from the exhaust. This will tell the computer how well or bad the vehicle is burning your fuel and hence adjust fuel level and other components to keep your vehicle running well. If the computer gave an faulty oxygen sensor, it may be clogged and need replacing. Typically oxygen senors are inexpensive, but due to the location of some of them, troublesome to replace. There is also a special tool you will need, looks like a socket, if you are going to be working in a tight spot. Hope this help you out.

May 13, 2009 | 2006 Chevrolet Trailblazer

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