Engine Light on P0139 code

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I understand this code is a sensor relating to the catalytic converter. How easy or hard is this to change out? Any special tools needed and how much does the part cost? My local dealership said it can cost anywhere from 80 to over 175 depending on the sensor, and autozone said it costs about 25 each. Big difference in price, so any info would be helpful.

[CREWZIN]

Your code if for the downstream oxygen sensor which is located on the left side of the catalytic converter. Trace the electrical lead from the sensor to the electrical connector and disconnect it. Unscrew the sensor with a suitable wrench (it's not necessary to use a special 02 sensor socket.

Forget the dealer and either do it yourself or ask around for a trusted mechanic.

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how about that. I took my gas cap off and retightened it and the error code went away. Saved me a bunch of money. Thanks.