Hey Guys,

I finally got my R32 running, and mostly without any dtc's, thanks to you guys. But I still struggling with one issue, the two fuel banks is maxing out in trim and the car goes into failsafe. Bank 1 is going rich (-25%) and bank 2 is going lean (+25%) both o2 Sensors is brand new, same kind and fitted in the same spot in the exhaust pipe after the exhaust collector. Originally the sensors is seperated to cylinder 1-3 and 4-6, but I bouight a premade exhaust with room for both sensors after the collector. 

I can simply not get into my head how the two values can be different? How does the ECU know which bank is which when the o2 sensors is in the same spot? Does it even know?? And how can the two signal be different when the sensors is in the same spot? When I delete the dtc's it start regulating again for about 20 seconds and then it goes to failsafe and throwing either P0040  - Sensor signals swapped. Or P3256 Regulation at lower limit Sensor B1S1, and the fueltrim goes to 0%

I asked in other VAG forums but no one where able to help, so maybe someone in here know something and would share it?

Any one?

Thanks for the reply nyet. I think it would be better for me to relocate the 02's into their right position, and thereby allow for both bank to regulate individually.

It is still strange to me that the two 02's can read so different fuel trim, it is almost like their are inverse, ex. one goes to -18% the other goes +18%    I cannot understand how they can read soo different in the same exhaust spot...

Hopefully I will relocate them later today and see if this helps..

It has been discussed a lot in the past. There are 3 ways to do it over asm patches and one way to do it over hardware.

In General Some people are copying over the trims from bank 2 to bank 1 and also the voltage, others are copying te_w and ti_w and some others reset something once in a while with only one instruction at a certain area..

From what i have disassembled over the last years there are also 3 variations of the orginal code that is calculating the trims.
i was able to make that work from 2 out of three but i didn`t had a car locally to test the third variation.

The best and most efficient way is to copy over the trims as PRJ wrote on another thread.In my car this way is working flawlessly.

The hardware solution would be to buy a exhaust manifold that supports dual/stereo lambda and there are 2 in the market.You will still have the same issue after a while if your sensors are installed in the same tube..

It will be fine like that.