Question about 2003 Cadillac Deville

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O2 sensor wat does a 02 sensor do

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O2 sensor monitors the air fuel ratio consistently. It makes sure that the engine receives optimum fuel mixture all the time. If the mixture will be rich, i.e. more fuel and less air, it will signal the ECU to reduce the fuel supply and if the mixture will be lean, the fuel supply will be increased.

Posted on May 09, 2013

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Posted on Jan 02, 2017

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1 Answer

What wire from the engine harness grey or brown goes to the blue signal wire on the 02 sensor


posted now 3 times.
no engine stated (of the 3)
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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.

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Where is the 02 sensor located on a 1994 oldmobile 88?


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1 Answer

My 1995 525i has fault code 12210 O2 sensor message. I replaced sensor- same code. I unplugged new O2 sensor but left sensor engaged in exhaust pipe. I read the output and it was very lean. In this...


if the 02 sensor is unplugged and you are reading a scan tool from the diagnostic link then of course the 02 reading is wrong
if you are using a volt meter right at the connector thats on the sensor then the 02 will read lean because the heating elements in it are disconnected when you unplug it
check 02 voltage with engine warmed up and 02 sensor connected you will have to pierce insulation with your probe

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It is the o2 sensor itself replace 02 sensor. Keep in mind you have four of them. the computer will tell you which one has the fault example. bank 1 sensor 2 If I can help anymore please repost with engine size I will be happy to help DRIVE SAFE TIM

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Non-california emission O2 sensor for other 49 states


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This sounds like an O2 sensor, there are 4 O2 sensors, 2 for each bank, 2 up stream by the exhaust manifold and 2 down stream by the catalytic converter. However the information you have given is limited, the explanation for the code seems to be missing some information. Ex: right bank sensor 1 to lean.

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Does this vehicle have that o2 sensor for the


Yes it does have an 02 sensor I recomend replacing the 02 sensor and doing a tune-up after replacing a converter

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