Computer problem
2001 Kia Rio 4 cyl Front Wheel Drive Automatic 140000 miles
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How do I replace the O2 sensor?

There is a special socket made for the job, however, Very frequently 02 sensors require the need to use an axcetelene torch to heat the pipe...and threads are occassionaly damaged, requiring repair, are you up to it?

No, I am not up to it so will bring to my local mechanic. Thanks anyway

Sure...