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What is the purpose of the o2 sensor - 2000 Jeep Grand Cherokee

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The oxygen sensor is the final piece in the "closed loop" engine management system. Typically located soon after the exhaust manifild, the device gives the computer the amount of oxygen, which is directly related to carbon monxide. or the mixture. This allows the system to have the precise mixture, adjusted constantly.

Posted on Sep 15, 2010

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For the most part it tells the onboard computer that the engine is getting the proper ratio of air. if it fails a check engine light will come on which your local emissions testing guy will fail you for. Its not an emergency fix it

Posted on Sep 15, 2010


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Where is o2 sensor?

It's always in the exhaust, that's what it measures or senses- the remaining oxygen content in the exhaust. So it is somewhere in the exhaust piping, anywhere from where the exhaust leaves the engine, which is the exhaust manifold, to the exhaust pipes leading off from the manifold. If you have a V-6 engine, some manufacturers put an oxygen sensor on each side or "bank" of the engine.
The oxygen sensor is never too far from the engine in the exhaust. Look for an electrical wire or wire set going to a piece sticking out of the exhaust. The main oxygen sensor, or sometimes two sensors, are placed always before the catalytic converter in the exhaust stream. For a different purpose, cars nowadays will also have an oxygen sensor AFTER the catalytic converter but still in the exhaust. The purpose is only to monitor the efficiency of the converter.

Mar 30, 2017 | Cars & Trucks

2 Answers

Where is O2 sensor located?

They are located on the exhaust system, one is before the catalyst and one after. If it is a v6 or a v8 it will have 4 o2 sensors. If your codes read sensor 2 it means the one after the catalytic converter.

Feb 20, 2016 | 2003 Suzuki Grand Vitara

1 Answer

O2 sensor purpose

purpose of O2 sensor is to fine tune injection system by monitoring exhaust stream and know what is the amount of oxygen. then is rich or poor then modify injection rate duty cycle

Sep 14, 2013 | Oldsmobile Delta 88 Cars & Trucks

1 Answer

I have a 2000 Mazda Protege EX, 1.6 L, manual transmission. Car was driving normal but hesitating and Engine light came in. Checked MAF hose & is not cracked, changed spark plugs & coil, but light...

Many o2 sensors have gone bad but 50% of the time when a code is set on a car about an o2 sensor there is another cause which is changing the emissions & setting the o2 code (ex. vacuum leak, bad plug, injector, it could very well be the cat etc.) The root cause of the problem must be found NOT JUST READING CODES! TAKE YOUR CAR ELSWHERE.

Apr 07, 2017 | Jaguar XJ8 Cars & Trucks

1 Answer

1993 f150 5.0 HO2S always lean ? how to fix it, the truck has been dualed and has no cat

You can not have any vehicle without Cats

First it is against federal laws to remove them

Second you can not be accepted for inspection

Those 2 you know about

You should also know the purpose of the oxygen sensors

They are for fuel injector pulse or fuel trim corrections

So if you have no Cats you have no need for the O2 Sensors
& they can not function & your screwed.

You also can not go to dual exhaust with only one bank being
monitored by only one O2

How did all that get by you?

Jan 21, 2013 | 1993 Ford F150 SuperCab

1 Answer

Code said to change o2 sensor and check engine light is still on

Not knowing the original codes, very seldom does a code actually say "replace" anything.
The purpose for trouble codes is to direct the tech to look for specific problems or issues.
If the code says, O2 sensor lean or rich, it is saying what the computer got for data from the sensor. Nothing else.
The tech has to figure out if the sensor was reliable or not.
And replacing more than one O2 sensor at the same time is extremely rare. About the only time I know of that is when the engine blows and the coolant or the oil in the exhaust takes out more than one sensor.
What is the code now ?

Jun 26, 2012 | 2006 Hyundai Tucson

1 Answer

The service engine light came on and the code a service station gave me was a P1168 code. Closed loop fault detected (Bank 2). I looked up some info online and found out it may be a oxygen sensor, which...

Closed loop is defined based off throttle position and the runs off of the O2 sensors on the exhaust manifolds.
The post-cat O2 sensors are strictly for emission purposes.
It sounds like you need to replace both of your O2 sensors UPSTREAM - on the headers/exhaust manifolds.
Resetting the ECU will not get rid of the problem and the CEL will return if the sensors do need to be replaced.

Jul 11, 2011 | Nissan Maxima Cars & Trucks

2 Answers

Where do we find the o2 sensor on a 99 ford expedition?

there is actually 4 o2 sensors all located in the exhaust, one on each manifold or just after the manifold and then there is one before the catalytic converter and one after it

Feb 14, 2011 | 1999 Ford Expedition

1 Answer

Check engine light is on. Code is showing P0420. What does this mean?

This code means the downstrean (behind) O2 sensor determines a reduced level of effectiveness in the cat. converter-it may not be 'lighting off' (600+ degrees) to burn any hydrocarbons left over from the combustion process. I can be that the cat is bad, or there is an exhaust leak before the cat, or the sensor itself is bad. You can do a visual inspection to determine if there is a leak, and use a scanner to see if the O2 sensor is working properly. It should read a fairly steady voltage and not switch nearly as fast as the upstream O2 sensor. The downstream O2 sensors only purpose is to monitor the cat-you might try clearing the Check Engine Light first to see if it comes back. Then you should consider contacting your dealer since you may be covered under an extended warranty that they have to put on emission devices.

Dec 24, 2010 | 2005 Dodge Grand Caravan

1 Answer

How do you replace the oxygen sensors in a 2001 nissan altima?

  1. Start the engine and allow it to reach normal operating temperature, then turn the ignition switch OFF.
  2. Disconnect the negative battery cable.
  3. Open the hood and locate the Oxygen (O2S) sensor connector. It may be necessary to raise and safely support the vehicle for access to the sensor and its connector. NOTE: On a few models, it may be necessary to remove the passenger seat and lift the carpeting in order to access the connector for a downstream O2S sensor.
  4. Disengage the O2S sensor pigtail connector from the vehicle harness connector. NOTE: There are generally 2 methods used to mount an O2S sensor in the exhaust system: either the O2S sensor is threaded directly into the exhaust component (screw-in type) or the O2S sensor is retained by a flange and 2 nuts or bolts (flange type). WARNING
    To prevent damaging a screw-in type O2S sensor, if excessive force is needed to remove the sensor lubricate it with penetrating oil prior to removal. Also, be sure to protect the tip of the sensor. O2S sensor tips are very sensitive and may be easily damaged if allowed to strike or come in contact with other objects.
  5. Remove the sensor, as follows:
    • Screw-in type sensors — O2S sensors are usually designed with a permanently attached wiring pigtail. This allows the wiring harness and sensor connectors to be positioned away from the hot exhaust system. It may be necessary to use a socket or wrench that is designed specifically for this purpose. Before purchasing such a socket, be sure that you can't save some money by using a box end wrench for sensor removal.
    • Flange type sensors — Loosen the hold-down nuts or bolts and pull the sensor out of the exhaust component. Be sure to remove and discard the old sensor gasket, if equipped. You will need a new gasket for installation.
  6. Perform a visual inspection of the sensor. Black sooty deposits may indicate a rich air/fuel mixture, brown deposits may indicate an oil consumption problem, and white gritty deposits may indicate an internal coolant leak. All of these conditions can destroy a new sensor if not corrected before installation. To install:
  7. Install the sensor, as follows: NOTE: A special anti-seize compound is used on most screw-in type O2S sensor threads, and is designed to ease O2S sensor removal. New sensors usually have the compound already applied to the threads. However, if installing the old O2S sensor or the new sensor did not come with compound, apply a thin coating of electrically-conductive anti-seize compound to the sensor threads. WARNING
    Be sure to prevent any of the anti-seize compound from coming in contact with the O2S sensor tip. Also, take precautions to protect the sensor tip from physical damage during installation.
    • Screw-in type sensors — Install the sensor in the mounting boss, then tighten it securely.
    • Flange type sensors — Position a new sensor gasket on the exhaust component and insert the sensor. Tighten the hold-down fasteners securely and evenly.
  8. Reattach the sensor pigtail connector to the vehicle harness connector.
  9. Lower the vehicle.
  10. Connect the negative battery cable.
  11. Start the engine and ensure no Diagnostic Trouble Codes (DTC's) are set.

Fig. 1: Since sensor locations vary between vehicles, the first step in removal is to locate the O2S sensors (arrows)...

    Fig. 2: ... and the sensor connector (2), which is usually near the O2S sensor (1), but removed enough from the heat of the exhaust system
    Fig. 3: Disengage the sensor pigtail connector half from the vehicle harness connector half

Oct 01, 2009 | 2001 Nissan Altima

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