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How to change the upstream o2 sensors on a 2004

Im trying to replace the upstream oxygen sensors on my cadillac srx but having a hard time figuring out which sensors are the correct ones to change..also how to change them.

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6ya6ya
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Posted on Jan 02, 2017

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JShreader
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SOURCE: 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!

Posted on Apr 01, 2009

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SOURCE: Replacing front turn signal bulb on 2006 Cadillac SRX

WikiAnswers
http://wiki.answers.com/Q/How_to_change_the_Cadillac_SRX_Front_Tun_Signal_Bulb

Posted on Feb 17, 2009

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Really, you need to use what the manual reccomends, in your case that should be premium. While you will usually not suffer damage from using lower grade, you will suffer performance and economy loss.

Posted on Oct 27, 2010

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SOURCE: Changing fuel filter on 2004 Cadillac SRX

If you go to the auto parts store they should have a fuel line disconnect tool that has a 5/16ths end an a 3/8ths end. The tool is shaped like an X. Before you start you need to pull the fuel pump fuse under the front of the REAR passenger side seat while the car is running and let it stall. it will release the built up pressure. This is important unless you want gas to spray every where. Then take the tool and start with the end of the filter with two lines. Place the appropriate end of the tool over the smallest inlet, push the tool in then pull the line towards the filter and then push the line away and it should disconnect. Do the same with line above. Then you can use the two appropriate size wrenches to disconnect the outlet end. reconnecting the new filter is simple just make sure your quick connect lines click in all the way and you tighten the outlet line well, I think its like 22 or 25 ft/lbs.

Posted on Dec 15, 2009

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VEHICLE ANTI THEFT SYSTEM HAVING PROBLEMS

Posted on Apr 13, 2010

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3 Answers

I have a 01 ford windstar im getting acode. P1132 can you explain why


P1132
Lack of HO2S-11 Switch, Sensor Indicates Rich A HEGO sensor indicating rich at the end of a test is trying to correct for an over-lean condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time. I would change both of the upstream (before the catalytic converter) O2 sensors (cylinder bank 0ne and two). 9 times out of ten this is the right guess to fix this code.

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4 Answers

What does code p0155 mean


P0155 = 2/1 O2 Sensor Heater Failure, Oxygen sensor heater element malfunction. logic dictates that you replace your O2 Sensor. DIY car obd2 code scanner online shopping

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1 Answer

PO174 AND PO171\


code p 0171 refers to system too lean bank1===causes ---intake /exhaust leaks--AIR system---MAF/VAF sensors --fuel pressure/pump--injector/S=== HO2S
code p 0174 refers to system too lean bank 2====causes intake /exhaust leak---fuel pressure/pump---injector/s---AIR system---hose connection/s
the fuel pressure is adequate
The HO2S is the heated oxygen sensor in the exhaust manifold /pipe before the cat converter
( is responsible for the fuel ratio settings )
you may have to pull the injectors to have them cleaned and tested
the maf/vaf sensor may have to be replaced as well

Apr 11, 2017 | 2004 Cadillac SRX

1 Answer

I HAVE CODES PO171 AND PO174 04 CADILLAC SRX 4.6L


please go to : repairpal.com/obd-II-code-po171-and-PO174 FOR MORE INFO, good-day!

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1 Answer

Service engine light on in a 2004 cadillac seille


Wow! I wish I had a dollar for every time I have heard this. I would be a RICH man! Please READ the article below to get a better understanding of what is going on:

What Else Could Be Wrong?

After reading the article, maybe you will understand that "lean oxygen sensor" codes are RARELY the fault of the oxygen sensor. When they are, it is HIGHLY UNLIKELY that BOTH upstream oxygen sensors would be defective at the same time. You probably have a large vacuum leak or a bad mass airflow sensor. Proper diagnosis required.

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An upstream O2 sensor is located before the catalytic (CAT) converter; check follow diagram location...


2_10_2012_4_54_42_pm.gif

Fig.: O2 sensor location (zooming link HERE)

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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Something is not right I changed many O2 sensors all of them has long wires.

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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

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Were are the O2 oxygen sensors location on a 2001 Cadillac DeVille


hi im wesall o2 sensors are located in the exaust system yours has one before the converter one after if it has duall exaust before the cat on drivers side will be upstream sensor bank 1 after cat right side will be bank 2 sensor 2
thanks wes
ps please rate me

Mar 28, 2009 | 2001 Cadillac DeVille

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