the O2 sensors are located under the car on the exhaust system. It looks like a large bolt with a wire coming out of the top. The one before the cat (bank 1 sensor 2) is in a funky place, and you will need to remove the heat shield around the exhaust pipe. This is 5 bolts- 4 take a 12mm wrench and one takes a 10mm wrench (?!)- whatever. Use a bunch of WD40 and let them soak for a little while, because they will be rusted and stuck. You won't be able to completely remove the top of the heat shield, but once it is loose you can get to the O2 sensor. Use a crescent wrench (or appropriate size metric wrench- I think it is a 20 or 21mm wrench), and gently give the O2 sensor a little twist. Now, go back up top and disconnect the cable that leads to it... it is under the right (passenger) side of the air filter housing. Look for the green inner CV joint and that's where the cable is. The connector has a grey plastic piece that flips back a little and releases the sensor half of the connector. Undo the connectors, go back under the car, and finish unscrewing the old sensor. Reverse the procedure to reinstall. I just followed the instructions above on a 2001 Forester and they proved accurate. I would add just a few points. On my Forester there were five 12mm bolts on the heat shield. Also apply WD40 around the old oxygen sensor gasket because the sensor may not break loose easily. After applying the WD40 go off and have a coffee, as I found it took at least 15 minutes to penetrate. Even so, I found I needed one good rap with a lead hammer on an open ended wrench to free the sensor. Significant hint: when disconnecting the cable connector, loop a string around the sensor plug before letting it drop down in order to remove it. You can then use this string to bring the new sensor cable up via the same route as the old one went. Also, definitely put anti-sieze compound on those heat shield bolts before putting them back on!
And they are expensive to replace... (i replaced one @ $400)
No, they will need replaced if defective.
Absolutely. Not just on Subaru but every car built that has an oxygen sensor. And they all do.
Have you had your 4 oxygen sensors replaced? It turns out when they replaced my oxygen sensors, they were after market parts so the service engine light did not come and gave codes even though they were replaced.
Two sensors, and replace them.
The oxygen sensors that connect to the exhaust system. There should be two, and they should screw into the side of the exhaust.
the auto parts dealer said that it was 4 oxygen sensors on that car.the 1998 Lincoln continetal
If the oxygen sensors for the 1991 Chevy 4.3 is running rich when it is warmed up it is best to have the sensors replaced. Once the sensors are replaced this should resolve the issue.
Only ones that have failed.
NO. there 2 different things / sensors.
As far as I know they can not be cleaned. Must be replaced.
In exhaust pipe before catalytic converter unscrew to replace
Oxygen bags? Are we talking air bags or oxygen sensors?
Two. Same type meaning are they both heated oxygen sensors with platinum or some other rare metal on the tip? Yes. Same type meaning same part number? No.
Fix any exhaust leaks, test/replace the oxygen sensors, replace the catalytic converter.
They are screwed into the exhaust system / pipes. Unscrew them and replace.
There are four oxygen sensors screwed into the converter assemblies. You need to know which one is faulty before attempting to replace them.
One can replace the oxygen sensors in a Volvo S80 by them selves by utilizing the help of a Chiltons manual on Volvo S80s. The faster route though more expensive, would be to enlist the help of a certified Volvo mechanic.
the oxygen sensor is located between the fist and second muffler. you will need to disconnect the sensor and it will then unscrew out of the exhaust pipe. I just did this on my H6 and I also needed to replace the air mix sensors on each side of the motor. they look just like oxy sensors and my need to be replaced as well. they are located on either side of the headers. the best way to get at them is from under the hood. you will also have to disconnect these sensors from the top and then unscrew them from the headers on each side.
Usually oxygen sensors are what would be screwed into the exhaust manifold.Usually oxygen sensors are what would be screwed into the exhaust manifold.
First you need to find a 1991 Lexus IS300...
No, only the faulty one, the fault code will tell you which is faulty.
oxygen sensors are part of the exhaust system
yes, it does have Oxygen sensors