Knowing the year of your car would be most helpful
Any shop that can't manage to trace two wires to the DME shouldn't be having your business.
Having said that I'm going to speculate a bit that your car was exhibiting cam timing codes, the sensor was replaced and the codes persist.
The cam sensor isn't an uncommon failure but if that were it a (good quality) new one would have fixed it. The variable valve timing system(VANOS in BMW speak) is a very common failure, especially in the '99 and later "tu" engine and this will, among other things, often present a cam timing error code.
Unless you are intent on repairing yourself my advice is to go to a BMW specialist shop and let someone with better skills have a go at it.
If you can leave two black stripes from the exit of one corner to the braking zone of the next, you have enough horsepower. - Mark Donohue
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