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Wiring diagram for O2 sensor

  • My Haynes rep.Manual shows 4 oxygen ensors. two upstream and tow down. The wiring diagran in Haynes identifes them as
  • sensor #12,
  • sensor #11,
  • sensor #22,
  • sensor #21.
  • Which two are the Pre-catalitic O2 sensors?

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5 Suggested Answers

  • 46 Answers

SOURCE: Diagrams

your oxygen sensor or sensors are located on your exhaust pipe just after your exhaust manifold

Posted on May 26, 2008

  • 27 Answers

SOURCE: Oxygen Sensor Location 2001 Ford Expedition Eddie Bauer

There are four o2 sensors on this truck. one on each side just below the exhaust manifold, and one on each side behind the second catalytic converters. (just about even with the back of the front doors.

Posted on Jun 18, 2008

motor1258
  • 6674 Answers

SOURCE: 1997 Dodge Stratus V6 oxygen sensor location

Upstream, as in ahead of the converter, back toward engine. Start at converter and work your way back, should be on exhaust pipe or even on manifold.

Posted on Jan 11, 2009

  • 412 Answers

SOURCE: replace oxygen sensors

these engines have 1 upstream o2 sensor and 1 downstream o2 sensor..the 1 in the rear exhaust manifold is the upstream and the 1 after the converter is the downstream..make sure you replaced the right one

Posted on May 16, 2009

  • 17 Answers

SOURCE: o2 sensor wiring diagram

A new 02 sensor will come with new wires and connector. If not get back with me I think there is a repair kit for that problem.

Posted on Jun 01, 2009

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2 Answers

Where is the O2sensor bank 1 at with a code of P0420. AND do I need to replace both sensors upstream and down. Or just the one that is showing up on the obd scanner.


Bank one is front side of cat. It should also tell u if it's cat 1 or cat 2. Depending on make an modle an yr. Catalyst 1 bank 2 is left cat back sensor. Catalyst 2 bank 2 is right cat back sensor. U do not have to replace upstream also. My o2 sensor Catalyst 2 bank 2 went bad. Had engine code for burning rich bank 2. Replaced tha down stream sensor an fixed problem runs better an better gas. This was in 97 gmc suburban. Idk what vehicle ur askin about. An I'm not to familiar with much about cars jus trucks an suvs.

Jan 02, 2017 | Cars & Trucks

1 Answer

Where is the 02 Oxygen Sensor before the cadalic converter on a 2006 Hyundai Santa Fe


Usually these are located on the exhaust manifold or just below the exhaust manifold and you should be able to see it in the engine bay. On V6 engines there will be one sensor on each of the 2 exhaust banks.
You will probably need to remove the engine cover to see the sensors on your exhaust.

If someone told you to replace these because you got a particular fault code I would be wary. A decent scan tool and basic diagnostics can show if the 02 sensor is working or not. Some faults often blamed on an 02 sensor are not due to faulty sensors.

Jan 09, 2016 | 2006 Hyundai Santa Fe

1 Answer

Where is the o2 sensor located on a 04 impala


You have at least two, possibly four.

If you have dual exhaust, so two catalytic converters on the car, you have 4 oxygen sensors: one for each bank of the engine and one behind each cat. An oxygen sensor after the cat is called a downstream O2 sensor, and is solely for monitoring the efficiency of the catalytic converter.
If you have single exhaust and one cat, you will have this one downstream O2 sensor behind the cat, and then you may have one or two "upstream" oxygen sensors. The upstream sensors are in the exhaust, close to the engine. If you have one for each bank of the engine, these upstream sensors may be right in each exhaust manifold on the engine, or in the exhaust pipe attached to the manifolds, but still close to the engine.
Some cars have only one sensor for the engine and one for the cat. A 2005 buick century with a 3.1L engine has only two sensors, one for the engine or one upstream sensor, and one downstream sensor.

If your Impala has only one upstream sensor, look on the back side of the engine, down low, after the exhaust pipes from the two sides connect. It should be there, the only thing sticking out of the exhaust that has wires to it. Follow the wires to the pigtail connector, if you are replacing it. Before trying to unscrew it, the exhaust should be warmed up. Not hot as in normal running temperature, but just heated up a bit. Less chance of stripping the threads if it is warm. Just don't get burned. If possible to get a wrench on it-7/8 inch open end. If no room for a wrench, stores sell a special socket to remove oxygen sensors.
The upstream oxygen sensors are what the computer reads to adjust or "trim" the amount of injected fuel for the correct air/fuel ratio.
I didn't expect to run on so long, hope you understand it. If not, or any further question, give a shout back.

Aug 30, 2014 | 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

1 Answer

How many oxygen sensors are there on a 1996 ford explorer 8 cyl., 4.0 eng.


The answer depends on the type of exhaust system you have. You will have either 3 or 4 total O2 sensors on your V8. If you have single exhaust with a single catalytic converter then you will have 3 O2 sensors (2 upstream sensors & one downstream sensor - "up or down stream" meaning before of after the catalytic converter). If you have either dual exhaust and/or two catalytic converters then you have 4 O2 sensors (2 upstream & 2 downstream). If you have an MIL light (malfunction indicator light, or "check engine light") the code will indicate "front bank / bank one", which is one of the 2 upstream O2's before the catalytic converter(s), or "rear bank / bank two", which is one of the O2's after the catalytic converter(s).

Apr 22, 2012 | 1996 Ford Explorer

2 Answers

OXYGEN SENSOR ID


Only way to tell is count the number of wires coming from it. You also need to know if its the right or left bank and upstream or down stream. Upstream is before cat converters and by or in exhaust manifolds, down stream is behind converters and only measures converter effeciancy.

Mar 08, 2010 | 2001 Volkswagen Passat

2 Answers

Im confused my car is a toyota camry 6cyl not 4cyl and some say it has 4 o2 sensors and others say it has 2, hum, wich is it???? please help and also is there a site where it shows me like a diagram as to...


I have no diagram,but there is what they call upstream,and down stream locations.Upstream,is above the cat-converter,the down stream is below the cat-converter.This would be per-side.You have a left,and a right exhaust manifold.The exhaust pipes run from each manifold(left and right)to the catalytic converters.So you would have to have on the left side a up stream o2 sensor,above the catalytic converter.and a down stream o2 sensor,below the catalytic converter.this would also be on the right side also,this would be the total of four(4) o2 sensors.I hope this is helpful.

Oct 16, 2009 | 1998 Toyota Camry

1 Answer

Where is the oxygen sensor located?


WHICH ENGINE YOU GOT?... V6 OR 4 CYLINDER?
On the V6 there are four (4) oxygen sensors (O2 Snsr), and on the 4 cylinder there are two (2) O2 Snsrs. The Upstream O2 sensors are in the exhaust manifolds at the top, and the downstream O2 sensors are at the bottom of it or in the exhaust pipe.

Oct 06, 2009 | 2003 Hyundai Tiburon

2 Answers

Had a fault code for the upstream o2 sensor on 03 dodge grandcaravan, replaced the o2 sensor and still get a po134 code. Could this be a vac leak or other problem?Exhaust leak? tune up? Injectors or other...


you do know that there are, at minimum, 2 (o2) sensors. One is directly below your manifold and the other is just before your cat. converter on the pipe.

Aug 25, 2009 | Dodge Grand Caravan Cars & Trucks

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