Changing the sensor.
Just changed my crankshaft sensor. I'm a pretty big bloke with big arms and I was finding it impossible to get it from the top so I opted for under. I could see it easilyfrom underneath but there is very limited room to access it. In the workshop I would guess they remove the exhaust to access the sensor. I really did not want to do that. I set up a jack, took the weight on the rear engin mount, undid the bolt and lowered the engine until I could fit my arm in the gap created to reach the sensor. I am telling you this because the operation itself took only 20 mins max but to reach this solution took many hours. Next time I know.