N42 hard to start (cold start and intermittent starts)

[btslee]

pressed Clear DTC and they disappeared.

 

[anaksarawak]

Drive your car for 100km and see if the errors appear again. Good luck bro

 

[btslee]

these are the errors that I have now

2738/A2 - Catalytic-converter conversion
2761/62 - Secondary air system bank2
2760/62 - Secondary air system
2721/01 - Lambda sensor ageing after cat

 

[btslee]

drove around, car suddenly went into limp mode. did a scan, the 4 errors previously posted (and cleared) did not return. however, one new error appeared.

20/84 - Output rev. sensor (n-ab)

Could it be possible part no. 4 in http://www.realoem.com/bmw/showparts.do?model=AY74&mospid=47688&btnr=24_0997&hg=24&fg=15 needs replacing? or could it be due to faulty crankshaft sensor as well?

 

[anaksarawak]

I suspect it's the crank sensor