idle fuel trims

[jonnx]

hi guys
east europe 2005 h6 spec b reporting in
i have (maybe) issue with fuel trims

i tested it today and this was bit messed
1 try idle:
LTFT1 3.9
LTFT2 -6.2

second try
LTFT1 11.7
LTFT2 0.8

short term trims oscillating around 0 +-1

the difference between banks is around 10 and I think it is a lot.
at 2500rpm stacionary it is (long term) 5,5 and 3 (short term oscillating bit more +-2)
and highway 2400rpm 6gear 2.3 and 3.9 and short term trims close to 3
which is i think ok

should I worry about the idle?

I measured it trough bluetooth obd and torque, car have 170k km


thanks

[3rspecb]

Looks like your front A/F sensors are gone. Have these ever been repalced ?

[jonnx]

no idea.
I have the car for a year...

Is there any way to check them ?

[jslayz]

you can apparently measure the resistance of them and that will tell you.
Unfortunately I dont know the values that mean they a not working properly...

J