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P0135 Volkswagen Code - HO2S11 Sensor Heater Circuit

So, this code would be for the bank 1 sensor 1; which, as you noted, is for the 02 sensor before the cat and closest to the engine.

We don't have the 1.6L here in the USA; so, I don't know, where the 02 sensor, is supposed to screw into a bung but if it is missing, you could drill a hole, have a new bung welded in place.

You might look online and search for pictures, of a whole cat and downpipe, that may show, where the bung is correctly placed with a oem part.
 

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Electrical wiring Gas Cable Fixture Auto part


As to the 02 sensor trouble code; is the sensor, still attached? You might check the fuses; there might be a inline fuse, shown in the photo above with the red circle.

For the heater circuit on the 02 sensor; you can do a continuity test and see, if the circuit is broken. If it is, then replacement is typically needed.
 
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