Is Google REALLY the preferred method of getting answers to a reasonable question around here???
No, I don't think that's an appropriate response. Personally I've never tried to clean an O2 sensor but I've heard of people try with mixed results.
First let me say that my post was a hyperlink to many sites with answers and opinions on the subject. Second I do think it is an appropriate response to some that has done no due diligence and expects to be able to post up and get an answer.
Many MANY questions have already been answered on this forum and a cursory google search netted many answers too. If you don't have the time to look around what makes you think people have the time to keep replying with the same answers to the same questions.
Perhaps I am being unreasonable and you are not able to search for your answer so here ya go.
The oxygen sensor is a very important component in a car's exhaust system. Due to the regular usage, over time products like oil, coolants settle inside the oxygen sensors. It is mandatory to clean the sensor to assure the performance is not affected. If you do not clean the sensor it could lead to problems like inefficient combustion and reduced performance.
Step 1 – Safety Measures
Before you start cleaning the oxygen sensors in the car's engine, follow a few safety measure. Wear your work gloves. Also protect your eyes by wearing work goggles.
Step 2 – Prep Work
Park your car in a clutter free area. Make sure the work area is well lit. It would help if the work area is well ventilated.
Step 3 – Raise the Vehicle
The first step is to locate and remove the oxygen sensors from your car. For this you will have to use a jack and lift the car. Make sure it is held in position.
Step 4 – Locate
Slide under the car and locate the oxygen sensors that need to be cleaned. The oxygen sensors that go upstream are located in front of the converter and the ones that go downstream are located right after the converter.
Step 5 – Lubricate
Spray WD 40 on the oxygen sensors. This will lubricate the sensor. After 10 minutes, unplug them and use a wrench to free the sensors from its fitting.
Step 6 – Container
Get hold of a container. Make sure it is safe to introduce gas into the container. The container should have a lid and the lid should fit tightly on the rims. There should not be any leaks.
Step 7 – Place the Sensors
Now place the oxygen censors in the container. Introduce gas. The quantity of the gas should be enough to submerge the sensors.
Step 8 – Work
Now close the lid of the container. Pick it up and swirl it around. This will help the gas to move and enter all parts of the oxygen sensors.
Step 9 – Rest
You need to let the container rest. Leave it in a cool dry place overnight. This will give the gas enough time to react with the settlements and dirt on the sensor.
Step 10 – Re-agitate
After having left the container overnight, you should now start with the remainder of the cleaning process. Lift the container and swirl it around a bit. This will re-agitate the mixture inside.
Step 11 – Remove
Now open the container. Remove the oxygen sensors. Use a paper towel to dry the sensors. Make sure you have your rubber gloves on at this point.
Step 12 – Final Step
You will notice that all the dirt has been removed from the sensors. You can now proceed to fit the sensors back into position. Use a wrench to tighten the bolts on the sensors.
PS this is from one of the sites in the link posted above. Use this information at your own risk. Id say do your own research but....