Hello Scotty and everyone,

I have a Volkswagen POLO 1.2L 2012, 3 cylinder engine, I had a mechanic scan it for any trouble codes, we found these listed, none of them tripped any car check lights.

The P001600 code was tripped after another mechanic changed the timing chain almost 2 years ago, even tho he used the crankshaft locking tools, sadly didnt catch it in time to make him redo the job for free, as it didn't trip any check engine lights.

Please, I know the sensor problems are related to one another, does it have to do with its wiring? or is the O2 Sensor going bad and have to be replaced?
these suckers cost a lot, last time I changed the bank 2, it was over 100$ (From MOROCCO, North Africa)

Any help would be appreciated, 
best regards