Question about 2004 Cadillac SRX
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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Posted on Jan 02, 2017
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.
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.
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.
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.
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
SOURCE: Are you suppose to use
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
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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