FIXED!!! Did a bunch of repairs and now CEL, DME errors P0021 and P0024 and misfires

[X5only]

So I did a bunch of work (to fix oil leaks and coolant pipe leak on my X5 4.4 N62) and after buttoning it all back together car idles very rough, bucks and CEL flashes or stays on. If I turn off and restart the engine then it idles fine as if nothing's amiss. The cycle restarts after car stays off for just a little while. Other than these issues the car now drives amazing and no more oil leaks and coolant leaks. Here're the errors I'm getting from INPA and GTI (note that they're all pointing to driver side of engine):

- 2A84: CDKENWS2: intake/inlet vanos 2: Limit stop adaptations out of valid range
- P0021 A camshaft position- timing over-advanced or system performance (bank2)
Possible causes (as shown in GTI):
o Vanos intake solenoid valve defective or soiled
o intake camshaft defective (vanos adjustment unit)
- 2A89: CDKAMWS2: outlet/exhaust vanos 2: camshaft adjustment has not reached retard/late position
- P0024 "B" camshaft -timing over-advanced or system performance (bank2)

And here are the repairs I did which fixed the oil leaks and coolant leak I had originally. Car did not have the above mentioned current issues before these repairs:
1) Replaced valve cover gasket and spark plug domes driver side only
2) Replaced upper timing cover gasket (heavy oil leak) and valvetronic motor gasket driver and passenger side
3) Replaced passenger and driver side vanos seals
4) Replaced coolant pipe with collapsible pipe. The coolant pipe seal had completely deteriorated causing major coolant leak from weep hole near the water pump.
5) Replaced water pump
6) Replaced intake manifold and valley pan gasket
7) Replaced crankcase ventilation pipes
8) Replaced Pressure Regulating Valve (passenger and driver side) - driver side had a crack
9) Replaced vacuum pump seals (heavy oil leak).
10) Replaced oil pressure sensor
11) Replaced coolant temp sensor
12) Replaced throttle housing gasket
13) Replaced eccentric shaft sensor (broke it during VC removal).
14) Cleaned MAF with CRC MAF cleaner spray
15) Replaced O rings in the fuel injectors (was totally unnecessary as they were all good at current mileage 111K miles).
16) Replaced coolant reservoir (leaking at the seams).

All parts used were OEM BMW (except the coolant pipe). The error codes keep coming back after cleanup. As an attempt to fix the issues I'm having now, I also replaced one driver side camshaft position sensor and cleaned driver side vanos solenoids (with intake cleaner spray) and changed engine oil all to no avail. I've checked all connections. Now I'm stuck. I have a feeling the solution may be very simple- may be a difficult to find vacuum leak I created inadvertently during the repairs? Any ideas?

Thanks for any pointers.

Indy (Zahntech Auto) cracked the issue- the CPS sensors were swapped!!! On the 2005 X5 N62 the sensors are different on the driver side The 2 camshaft position sensors, one for the exhaust camshaft (three pole connector, 12 14 7 518 628) and one for the intake camshaft (three pole pigtail lead cable, 12 14 7 539 172). Took them just an hour to figure out my mistake. I had carefully labeled all the connections during removal and not sure how I messed up during assembly....may be orientation of the label. Although I took many pictures next time I'll make sure to take pictures of just everything and not rely only on labeling.


Car runs strong, idles great and initial fixes I had done are all good. Now I think I'll reward myself with a Dynavin N6 upgrade