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The P2A00 code means that the O2 sensor reads a voltage outside the normal range. A faulty oxygen sensor causes this. it’s more likely that you have another problem with your vehicle. The most common cause of this code is an electrical short or wiring issue in the engine bay, which will require further inspection and repair work to fix.
If you have access to an ohmmeter, check the continuity between pins 1 and 2 of your O2 sensor when it is cold, then again when hot – both should give similar readings (less than 1 ohm). If not, replace your O2 sensor!