Question about Mitsubishi Cars & Trucks
If you check other faults it says comm fail. opperation cant execute
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Posted on Jan 02, 2017
The #2 O2 sensor should be found "down stream" from the catalytic converter. When you crawl under the vehicle, follow the exhaust pipe from the engine to the catalytic converter. Right before the converter, you'll see one of the oxygen sensors. (That's number 1.) When you follow just past the catalytic converter, you'll see another one. (That's number 2, the one you're looking for.)
The role of the #2 O2 sensor is to make sure not only that the #1 sensor is actually doing its job of maintaining a 14.7:1 air/fuel ratio governed by the computer, but it's also making sure that the catalytic converter is not only present, but also that it's doing its job as well.
This isn't a very expensive part, it's easy to find, and will require an O2 sensor socket to do the job. Make sure you don't use any grease on the new sensor! It can actually render it unusable and cause your check engine light to come on again.
That reminds me...When you change out your #2 O2 sensor, in order to turn off the Check Engine light, you'll need to take it somewhere such as an auto parts store like Advance Auto Parts, who have a scanner to connect to your car's computer and clear the fault code. Otherwise, your computer will have to count a certain amount of ignition cycles before it determines that all is well with your emissions system.
Good luck, have fun, and I hope this helps! :)
Posted on Sep 08, 2009
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