I have replaced both o2 sensors and I'm still getting faults. More information on attached screenshots.

It looks like wiring of front o2 sensor is damaged. What is the quickest way to replace it?

I have cleaned the plugs with contact spray and brush.

Wires seem to look good around plugs (no cracks etc) but I have not checked what's under plastic wire covers. So I assume damage is hidden somewhere.

I have used VCDS with engine OFF, ignition ON.

Engine code is BBZ.

Edited 24 January24 Jan by js12oo

I would need to know where those wires from o2 sensor go in order to do continuity test but I don't have access to wiring diagrams.

Z19 is the heater within the pre-cat sensor.

It gets 12V from the blue/red wire at the bottom of the diagram, ground side of it is PWM'ed by the engine ECU via the brown wire going to ECU pin 5.