C30 Engine : Engine issues, turbo and CEM problems

[rahulzerg]

Hi all,

I have started experiencing some problems with my C30 D4 auto.
Sequence of events:

1. I cleaned the area around and replaced the pollen filter with the CEM/bracket removed (battery terminal was disconnected) and refitted everything.
2. The car car drove fine for a few days.
3. On the motorway while accelerating the car throws up Urgent engine service required with red symbol. Loss of some power while accelerating. MPG dropped and was all over the place. Engine didn't cut off but to avoid more issues I pulled into the hard shoulder and switched the engine off. Got the car recovered home.
4. Checked with a code reader for faults. Loads of CEM, SAS, SRS, ICM fault codes came up. No engine ECM codes though. I thought I might have messed up the CEM connection or didn't seat them properly.
5. Cleaned the CEM pins and connectors with contact cleaner, checked the wiring and reconnected the module (battery was again disconnected). Deleted the codes and drove the car for a short trip.
6. The car still felt a bit underpowered, MPG was all over the place, very low mostly. So I checked the DTCs again and came up with only one P023600-turbo/supercharger boost sensor A circuit range/performance general fault info. No sub type info.

I searched the forums and saw there is a MAP sensor that could be at fault. There was one on the intake manifold. I removed and cleaned it but the fault is still there. Pic here

I am not sure if there is another sensor somewhere else?

Now my question is Did I mess something up while fiddling with the CEM?
Is there anything else I can do to find what is wrong with my engine. Any help would be super welcome.

Live data
Engine on -

Engine off -