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while the engine is running carefully and slowly loosen the oil cap and lift it SLIGHTLY off the valve cover- if the noise goes away it may be a vacuum leak. Be careful- oil will spray out if you lift the cap up too far!!
By now you should have a "check engine" light on which will help in diagnosis. If not a qualified technician will need to perform some diagnostic testing and review data from your car to help get to the bottom of the issue! Good luck, Greg
the fan switch itself has a high failure rate on that car. If you do not have the ability to perform the needed testing to pinpoint the problem you may want to try a switch- they are cheap and easy to replace. Greg
Coolant odor in a BMW is not very noticeable- the coolant BMW uses does not have much odor. You would also have a low coolant warning light on by now. When a valve cover gasket is replaced on a 530i oil will leak onto the exhaust manifold- it is possible the shop that did the work did not clean it up well or may have not installed it properly. Let me know if you need more help! Greg
Is the "check enigne" or "service engine soon" light is on? A fault code would help but they do not "diagnose" problems- they just give us an area to focus on. Good luck, Greg
It sounds like you may have multiple issues but the flashing check engine light indicates a misfire- start there 1st. Greg
Not all scan tools will read air bag faults. You need to use a tool that can access the air bag module. If you can and it shows no faults you may have a faulty control unit. Good luck, Greg
Make sure the correct fluid was used and the level is correct. Greg
THIS COULD BE A DANGEROUS CONDITION- HAVE THE STEERING INSPECTED TO INCLUDE BALL JOINTS, TIE ROD ENDS, STEERING GEAR AND ANY OTHER COMPONANTS.
Help us help you by giving more info. Did they perform diagnostics? Any fault codes? We dont have enough info at this point. Repost and I will try to help! Greg