P0422 (Bank 1)(5) ...what does the Bank 1 and 5 mean on a 2000 vw cabrio

Question

Main Catalyst Efficiency Below Threshold (Bank 1) (5). What does the 5 mean.

Answer 1

P0422 Main catalsyt efficiency below thresold Bank 1

There should be no refference to 5. what monitor the catalytic is the downstream 02 sensor or the 02 sensor after the catalytic.