My check engine light shows the following codes:

P0150 O2 sensor circuit malfunction (Bank 2 Sensor 1)
P1386 ?
P0560 System voltage malfunction

Does anyone know which side is bank 2 (drivers or passengers)?
Is sensor 1 before the cat or after it?

What is P1386?

I just changed the battery and now I get P0560. Is my alternator going out?

Any help would be appreciated.