BMW E60 N53 combustion misfire - O2 Sensor dead?

[Smarti_]

Hey guys I got an issue with my N53B25 engine (sorry if there are some misunderstanding but I'm from Germany and I'm not using google translator since it fails too often and whirls up some weird stuff)

This happens every morning cold start or every time I let the car cool down for like 5 hours:

When I start up the engine it runs fine for like 10 seconds and then the nightmare starts... It starts shaking and doesn't stop shaking for 8 - 9 minutes. If I try to restart the engine before the 8 - 9 minute mark it still keeps shaking, maybe a little bit less but who knows could be placebo too at this point. Anyways after the 8 - 9 minutes it runs very well and got no issues at all even at accelerating on the autobahn.

My fuel usage was at 19L/100km until I took to the Autobahn for like 40 minutes at average speed of 130km/h (110km/h - 150km/h). It went down to like 8.5L/100km. But I'm pretty sure tomorrow when I need to go out it will rise up super fast during the 8 - 9 minutes cold start idle in the garage.

If I step out of the car (while it is shaking) it smells super bad in the garage, most likely gasoline.

Another thing is, during this cold start the liter/100km goes up kinda fast imo, the steps are 0.1liter/100km.

The codes in the DME are:

29CE: Combustion misfire, Cylinder 5 (Verbrennungsaussetzer, Zylinder5)
29CF: Combustion misfire, Cylinder 6 (Verbrennungsaussetzer, Zylinder6)
29CC: Combustion misfire, multiple Cylinders (Verbrennungsaussetzer, mehrere Zylinder)

On Wednesday I got the idea to change the plugs of the O2 sensors, pre-cat. Like I did not take out the O2 probes I kept them as they are just unplugged the plugs and mixed them. I cranked up the engine and it was literally running with ALMOST no shaking, it was literally just idling a little bit rough and I got confused. Turned off the engine and started it up again - et voilá the shaking began again inclusive the yellow engine control light (as always when it shakes). I checked up the codes:

2C24: O2 Sensors pre-cat: swapped (Lambdasonden vor Katalysator: vertauscht)
29CE: Combustion misfire, Cylinder 2 (Verbrennungsaussetzer, Zylinder2)
29CF: Combustion misfire, Cylinder 3 (Verbrennungsaussetzer, Zylinder3)
29CC: Combustion misfire, multiple Cylinders (Verbrennungsaussetzer, mehrere Zylinder)

Well I was happy and thought I would've found the issue... I called a friend to delete the O2 Sensors out of the DME (idk if that is even possible now tbh) and handed him over my DME. He deleted the O2 Sensors and I plugged everything back together how it was before or lets say how it is done correctly.

Well the shaking and the codes are back as always:

29CE: Combustion misfire, Cylinder 5 (Verbrennungsaussetzer, Zylinder5)
29CF: Combustion misfire, Cylinder 6 (Verbrennungsaussetzer, Zylinder6)
29CC: Combustion misfire, multiple Cylinders (Verbrennungsaussetzer, mehrere Zylinder)

Today I tried to check if my Injectors are leaking but I (obviously ) couldn't remove the sparkplugs since I don't have the special socket. So what I did at least was changing the Cylinder 4 ignition coil with Cylinder 5. Cleared all errors, cranked up the engine but the codes were still at cylinder 5 and 6 + the shaking inclusive the beautiful yellow engine light.

So then I looked up on the live data of the O2 Sensors and everything looked like pretty normal to me?! I uploaded it on YouTube.

I have to add one thing currently my NOx System is NOT working due to these codes:

002B0A: NOx-Sensor, electric (NOx-Sensor, elektrisch)
002B09: NOx-Sensor, Lambda linear (NOx-Sensor, Lambda linear)
002B0B: NOx-Sensor, Lambda binary (NOx-Sensor, Lambda binär)

So my friend removed the NOx out of my DME and these codes do not exist anymore nor does it go into the stratified mode, it stays in homogen.

Here is the live data clip of the Bank1 and Bank2 O2 Sensors. The engine is running idle but at after 20seconds I gave it a little gas.

Little translation :

"Hinter Katalysator" = post-Cat
"Vor KAT" = pre-Cat
"Lambdasonde" = O2 Sensor
"Gemischanpassung, Addition" = Mixture adjustment, addition


To my question:

Do you think the O2 Sensors are dead?
If not what could be the issue? Why do the data of O2 Sensors look fine (at least to me)? Why does it take like 8 - 9 minutes until the car runs fine?

I highly appreciate anyone that read until here and I appreciate even more the ones who got a suggestion / idea / answer to this. It gives me really bad headache

[ptpending]

make a good cup of tea and coffee, sit in comfortable chair and go to bimmerprofs.com site