Faulty Lambda sensor - location?

[Horrgakx]

I have a fault on a Lambda sensor which is intermittently throwing this error. Looks like it's in Bank 3, S1 (whatever S1 is). Does anyone know where abouts it is, as I'll need to ask the garage to change it.

24416 - Linear Oxygen (Lambda) Sensor B3 S1; Pump Current Wire
P3164 00 [11101000] - Open Circuit
MIL ON - Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 2
Fault Frequency: 9
Mileage: 120402 km
Date: 2025.03.11
Time: 16:25:46

Engine speed: 1229.00 /min
Normed load value: 36.9 %
Vehicle speed: 51 km/h
Coolant temperature: 60 C
Intake air temperature: 12 C
Ambient air pressure: 1020 mbar
Voltage terminal 30: 13.853 V
Unlearning counter according OBD: 40
Engine torque: 227.5 Nm
Fuel level: 49.00 l
Intake camshaft B1 active operating state: 1

[steamship]

Both the V12 and W12 are 'split' into 4 banks. Banks 1 and 2 are on the left side of the engine, as you look at it from the front of the car. Banks 3 and 4 are the right side. There are two lambda sensors per bank, labelled 1 and 2. 1 is the pre-cat, and 2 is the post-cat.

With that in mind, B3S1 'should' be sensor G285 (top left) in the attached image. The image is taken from the following SSP on the W12 engine:

SSP490 6.3l W12 FSI engine.pdf

If I was replacing it, I'd first disconnect G286, and go for a very short drive, and then scan the car again. If my numbering is correct, you'd then get an error code for B4S1 (G286). If that was the case, I'd then reconnect it, and replace G285.

[Horrgakx]

Cracking, thanks very much!!

That looks like it might be a challenge to change....?

[steamship]

Originally Posted by Horrgakx

That looks like it might be a challenge to change....?

I think that applies to most things on the W12.