Engine noise---crankshaft sensor and base

You can do this yourself, a crankshaft position sensor probably costs anywhere from 15 to 70 bucks or so, depending on what brand. If you have the 12v engine, you can do it from above, 24v may be easier if you access it thru the fenderwell, use some car ramps, good plastic ones can be had for around 25 bucks. Damage I don't know about, it sends a signal to the pcm about crank position