Question about Cadillac Eldorado

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I can't find where the o2 sensor is located on the exhaust of my 1990 cadillac eldorado.

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It will be on the top side of the exhaust usually in the area of the front seats there should be one before the converter and on after

Posted on Apr 07, 2011

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1 Answer

02 sensor on a 1999 cadliac eldorado


O2 sensors are all screwed into exhaust system there are from 1(older) to 4 (modern 2 exhaust circuits). The uppers are located before the catalytic converter and the lowers after the catalytic converter. They generally need to be replaced between 50-100,00miles as recommended by the manufacturer.

Sep 16, 2015 | 1999 Cadillac Eldorado

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O2 wiring diagram


The pink and black-white wires are for the heater, the other two are for the sensor circuit.
If you can tell me which sensor I can get the colors for you.

Aug 14, 2012 | 1996 Cadillac Eldorado

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1990 Cadillac biaritz engine check light on>>code E049 represents what?


E049 - Air system faultECM failed to detect an increase of 15 or more integrator counts when air is diverted to exhaust manifold and system has failed 4 times.Check operation of air injection system, verify oxygen sensor operation,Check all hoses, pipes & wiring for damage.

Sep 09, 2011 | 1990 Cadillac Eldorado

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Where are the o2 sensors located on a 2001 cadillac eldorado


Hi there,

You have 4 o2 sensors on the new one 2 in front of catylitic converter and 2 after on the exhaust.

Hope this helps...

Jan 24, 2011 | 2001 Cadillac Eldorado

1 Answer

Auto shop advosed that the eldorado's compter


I show that your car uses one sensor located in the exhaust crossover of the exhaust head pipes off the engine, here is the part number and prive, labor time just to change the sensor is 1/2 hour plus the diagnostic time to test the system and determine the sensor was the problem,
ACDELCO Part # AFS73 Price $74.00 so $650 is way hight in my opinion.

Dec 23, 2009 | 1994 Cadillac Eldorado

2 Answers

O2 Sensor on a 1996 Cadillac Eldorado


you have 4 o2 sensors on the new one 2 in front of catylitic converter and 2 after on the exhaust

May 23, 2009 | 2001 Cadillac Eldorado

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

2 Answers

Location of O2 sensor


In the exhaust pipe before the catalytic converter

Dec 09, 2008 | 1990 Buick Regal

1 Answer

Locate O2 Sensors in 1994 Cadillac ElDorado


o2 will not make your car do that you have other issues check for secondary ignition miss or primary ignition miss sounds like you are dropping a cylinder dumping raw fuel to contaminate 02 sensor find the real problem to fix your light

Nov 22, 2008 | 1994 Cadillac Eldorado

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