Thankyou for your response
Yes had a look at wiring diagram, there are several sensors etc on supply including MAF, + both Lambda heaters. also connected scope+ amp clamp to heater wire and did a good wiggle test, no issues found.
This went out for 2 days as customer needed to use, came back now got extra code for rear sensor > 16523 B1S2 response to slow / P0139 no signal intermittent.<
Checked EOBD and get P0135 B1S1 heater and again still in VAG same > 17511 B1S1 sensor heating.<
The resistance of rear sensor heater is 14 ohms which I thought sounded high but no info on AD.
Cheers Aidan
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