Those beloved fault codes again; 17972,17966,17521

[MikkiJayne]

From my dodgy idle thread:

Originally Posted by Me

Reading up a bit more about the O2 sensors in ElsaWin I found the procedure to re-learn the adaptation values (basic settings 32 & 33), and also how to turn them on and off (basic settings 99).

Measuring block 1 shows the values for each bank:



Might be worth a scan of the wiring diagrams to see if the TB and B1S1 O2 sensor share any wiring. Bad ground maybe?