2005 Acura MDX Code P2247 21-VCENT: EXACTLY which O2 sensor failed?

Question

I need to replace this oxygen sensor myself, but need to know exactly which one of the four sensors failed: driver or passenger side, above/before or below/after the "warm up" catalytic converter? Thanks for helping a guy who's mechanical, but doesn't have the OBD diagnostic unit!

Answer 1

P2247 Front A/F sensor (Bank 2 Sensor 1) VCENT line high voltage

This code represent more of a disconnection either at the sensor or on the harness to the ECM, The location is at Bank 2 this is where cylinder 2 is located being sensor 1 this is the upstream or engine monior sensor. Acura had faulty sensor connection that lead to a DTC codes for the  airflow sensor, check the connection .