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For the past month I have been getting the same 4 codes every 3-4 days. They are:

P0130 lambda B1 S1 malfunction in circuit
P0130 lambda B1 S1 malfunction in circuit intermittent
P1103 lambda sensor heating B1 S1 performance too low intermittent
P0133 lambda sensor B1 S1 response too slow.

It will always come on when driving at roughly 50-60mph which I do everyday on my way to and from work. It either comes on a little bit after the engine has got up to temperature or a while after.

One thing that I have noticed is that it will have a high idle (Roughly 1200rpm) when first started before the engine light comes on while driving. Car doesn’t seem to be affected other than extra fuel consumption when the lights on.

I have had the B1 S1 sensor replaced with a Bosch one and the manifold/cat was replaced by a garage at the same time as old sensor had been cross threaded into the manifold.

Only difference is I wasn’t getting the response too slow code before the manifold/cat was replaced.

Edit: When up to temperature (coolant 90C CAT 656C) at idle B1 S1 is reporting a voltage of either 1.48 or 1.52. B1 S2 is reporting a voltage of 0.7, 0.74 or 0.78. B1 S1 also has a dynamic factor of 3.063 and a conversion factor (can't remember name of the field) of 0.73

All these duff codes are still coming from your new Lambda sensor in the new manucat assembly, just one thing, VW Group cars do tend to be prone to not liking working with aftermarket Lambda probes for long. At the factory, that engine would have been fitted with an NTK brand of Lambda sensors - that is a sensor made by NGK but they market their sensors as NTK.

I'm assuming that we are discussing a petrol engine here - 3 or 4 cylinder and engine code?

Edit:- where the probe connector plugs into the car's wiring might need looking at for damage or corrosion.

The lambda sensor that was fitted was a Bosch one (Bosch 0258007357)but as you mentioned VWs can be a bit temperamental with aftermarket ones but I didn’t think this temperamental.

I suspected the wiring to the plug but never got round to having a look. I’m guessing it’ll be fairly easy to repair any frayed or damaged wires with some solder as it does seem quite exposed?

It is the petrol 3 cylinder 1.2 12V code AZQ

Edit: Found the NTK sensor NTK UAR9000-EE020

Fitted the NTK sensor and had no issues for around 2 weeks. Engine light came back on today with same codes. Only causes I can think of now is the ECU itself or the cat. Any other ideas?