Hi is there anyone that can help me out with a quick breakdown of wiring wideband O2 sensors into factory harness 00 s4 APB so ECU is reading data I've seen a couple with single sensors wired in using yellow analog output wire but unless I'm missing something that's only half the battle being the other bank will not have input I know there's a secondary output of the brown wire but from my reading it looks like the voltage range and input is scaled differently thanks in advance

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I´m aware this is a old topic, but it seems there is less experience replacing the standard narrowband pre cat sensors with wideband sensors and feed ecu from lambda controller.

It´s a friends RS4 which needs to be a innovate DLG-1 set installed, so there will be 2 separate analog outputs for each bank which can be used to feed each ecu input. The goal is NOT to run ecu in closed loop under WOT, the goal is just a monitoring function for the driver. Since we live in germany we can run WOT over long time at high speed and there is always a fail risk with 20 year old cars. And this would be the easiest way without weld another thread or replace past cat sensors and get not correct values again.

The innovate WB output can be programmed to a lower and higher voltage setpoint dependend to a lambda value, the narrowband sensor output a curve, but i think this can be neglected because the NB is only accurate/used in a small window around lambda=1. I could also not found a linerarisation curve in ecu for pre cat sensor, only for past cat. Not sure untill now what i miss there. Sure the installation needs be very careful to avoid any ground offsets and some adjustment in ecu to avoid errors, e.g. some higher start delay untill the WB output is ready, switching off sensor heating, etc.

Does anyone successful did such installation or any doubts that it will work?

Monitoring just means the car has a visible gauge in dashboard. Only for security if there is some fuel pressure drop or injector fail in long WOT runs. When you notice something changed you better check the car...

Last year this car was driving with about +/- 400 g/s and a desired lambda 0.84, there are just some upgrade turbos and 0280158123 injectors, fuel pump, etc. installed. With bad intercoolers with a lot of pressure drop. We was under the 945° limit from EGT sensors, maybe we can make it more lean, but not without precise lambda readings. Now there are new IC installed. Temperature was fine, but we do just not trust in the old car. Sure via usvk and usvk2 it can be logged then too, we had 0,9V there, but NB sensors are not precise far away from lambda=1.

Anyway this should not be the problem, the car is running fine. Maybe someone has experience with retrofit WB as piggyback.