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Where is the forward oxygen sensor located - 2000 Honda Civic

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On my 98 civic, the first O2 sensor is right on the front of the motor under the metal plate that covers the exhaust manifold.

Posted on Jul 31, 2008

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My husband cannot locate the oxygen sensor on the 1991 civic. Can it come out easily and where can I get a scematic or something to locate it? Sheryl

Posted on Jul 28, 2008

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P0057 - Where is Sensor 2 Bank 2 Located?


On V engines one of the cylinder heads is located further forward than the other. That is the side that has cylinder #1 on it. That is bank 1. The other side is bank 2. There are 2 oxygen sensors-one in front of the cat convertor and one behind it. Sensor 2 is behind the convertor. It looks kind of like a spark plug with wires coming out the top

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Kia oxygen sensor


Bank 1 is cylinder 1- drivers side, in forward facing engines.

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Code reading po135 2002 jeep


PO135 is oxygen sensor heater failure bank 1 sensor 1, most likely if no wiring damage is seen it is the oxygen sensor itself. (forward most oxygen sensor on #1 cylinder side)

Apr 04, 2013 | Jeep Grand Cherokee Cars & Trucks

1 Answer

What is the best way to remove O2 sensor bank 1 sensor 2?


Here is the low-down on oxygen sensors, and their location designations explained:

Oxygen sensors are screwed into the exhaust system at various points. Some people say that there are 4 oxygen sensors, but technically, that is not correct. Only the front 2 are considered oxygen sensors.

These oxygen sensors are screwed into the exhaust pipe or directly into the exhaust manifold, one on each bank. Because they are in front of the catalytic converter, this is often referred to as 'upstream'.

The other 2 are actually called catalyst monitors. They are oxygen sensors, but they serve a different purpose. They monitor the activities of the catalytic converters, thus the name, catalyst monitors. They are screwed into the exhaust one on each bank, after, or downstream, of the catalytic converters.

On a 4 cyl engine, there are only a total of two such sensors, the one in front of the catalytic converter is the O2 sensor, the one behind the cat is the catalyst monitor.

The location names for them are as follows:
  • On a 4 cyl, the front / upstream is called "bank 1 sensor 1" and the rear / downstream sensor is called "bank 1, sensor 2."

  • On a V6 or V8 engine:

    • the passenger side bank on a forward facing engine, or the bank closest to the firewall on a transverse mounted engine, is bank number 1, so the forward / upstream sensor on that bank would be "bank 1, sensor 1."

    • The driver's side bank (forward facing mount engine), or front bank (transverse engine) would be bank number 2, thus the forward / upstream sensor on that bank would be "bank 2, sensor 1," and the rearmost / downstream sensor on that bank would be "bank 2, sensor 2."

Jul 28, 2012 | 2004 Mitsubishi Endeavor

2 Answers

2004 saturn vue v6 sensor 1 bank 1 where is that


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Fig. Heated Oxygen (HO2S) location (bank 1, sensors 1 & 2) - 3.5L engine


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Fig. Heated Oxygen (HO2S) location (bank 2, sensors 1 & 2) - 3.5L engine


Hope helps.

Jan 28, 2011 | Saturn Vue Cars & Trucks

1 Answer

How do you know which o2 sensor is bank 1 sensor1


sure do. the bank 1 sensor 1 oxygen sensor is located in the exhaust pipe on the same side as the number 1 cylinder. So if the number 1 cylinder is on the driver's side, then the bank 1 sensor will be the forward most oxygen sensor on the drivers side, then next one in line will be the bank 1 sensor 2. Obviously, the other side will be bank 2, sensor 1 and bank 2 sensor 2.....good luck!

Aug 25, 2010 | 1997 Chrysler Sebring

3 Answers

Were on exaust is oxygen sensor in 1999 subaru impreza auto sport


On the SOHC engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the front catalytic converter. On the DOHC engine the front oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the catalytic converter.

Oxygen sensor location-Baja 2.5L SOHC engine
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Oxygen sensor location-Baja 2.5L DOHC engine
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On the 2.0L engine the front (A/F) oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the rear catalytic converter. On the 2.2L engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the rear catalytic converter.

Oxygen sensor location-Impreza 1998-2001 2.2L engine
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moz-screenshot.pngOxygen sensor location-Impreza 1998-2002 2.5L SOHC engine
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I hope helped with this; remember rated this help. Good luck.

Nov 20, 2009 | 1999 Subaru Impreza

2 Answers

How many oxygen sensors in a 2001 chrysler sebring 3.0


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Fig. Heated Oxygen (HO2S) location (sensor 1)-2.4L engine

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Fig. Heated Oxygen (HO2S) location (sensor 2)-2.4L engine

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Fig. Heated Oxygen (HO2S) location (bank 1, sensor 2) (bank 2, sensor 2)-2.7L engine

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Fig. Heated Oxygen (HO2S) location (bank 2, sensor 1)-2.7L engine

I hope help you with this (rated this help). Good luck.

Sep 09, 2009 | 2001 Chrysler Sebring

1 Answer

O2 Sensor on a 1996 Cadillac Eldorado


Hello mrsalbert, my name is JShreader. Thank you for choosing fixya.com

Depending on which oxygen sensor you are looking for...there are several of them throughout the Exhaust System. I will start out by giving you a brief description of what and oxygen sensor is, and they're general purpose.

DESCRIPTION
Four Heated Oxygen Sensors (HO2S) are mounted in the exhaust system where they monitor the oxygen content in the exhaust stream. There is an oxygen sensor mounted in each exhaust manifold and one on each end of the catalytic converter. the oxygen sensor located in the front exhaust manifold is the Bank 2 Sensor 1 (Front) sensor. The oxygen sensor located in the rear exhaust manifold is the Bank 1 Sensor 1 (Rear) sensor. The oxygen sensor located in the Y-pipe ahead of the catalytic converter is the Bank 1 Sensor 2 (Pre-converter) sensor. The oxygen sensor located in the catalytic converter outlet is the Bank 1 Sensor 3 (Post-converter) sensor.

OPERATION
An oxygen sensor acts like a battery because it creates its own signal voltage once it reaches operating temperature. This voltage is produced when the oxygen content in the exhaust stream is different than the oxygen content in the atmosphere. A lean condition (high oxygen content in exhaust) will produce a low voltage (near 0 volts) and a rich condition (low oxygen content in exhaust) will produce a high voltage (near one volt). The PCM provides a reference signal voltage (0.45 volt) and a ground to the sensor. The PCM reference voltage is necessary because the oxygen sensors do not provide their own voltage until they reach operating temperature.

HEATING ELEMENT
the oxygen sensors also incorporate a heating element inside of the sensor housing. This heating element is energized with the ignition On and allows the sensors to reach operating temperatures quickly. The PCM can then use oxygen sensor information sooner after engine start-up.

PCM INPUTS
The PCM uses oxygen sensor information during Closed Loop operation to constantly adjust fuel control to reduce exhaust emissions. Because the oxygen sensors provide information sooner after engine start-up, exhaust emissions are reduced. Faulty oxygen sensors will cause various driveability conditions and will set a DTC.

That being said...I uploaded a .pdf for you of pictures showing the locations of ALL the oxygen Sensors on your Vehicle. You can download it by clicking HERE.

I hope this helps you. If you have any more questions or need any more diagrams, please don't hesitate to ask...Thanks again, JShreader!

Apr 01, 2009 | 1996 Cadillac Eldorado

1 Answer

2001 crysler 300 M


O2 sensor is located forward of the catalytic converter. You will need a 22mm wrench or O2 sensor socket to remove and reinstall.

Dec 25, 2008 | 2001 Chrysler 300M

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