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They can be a snug fit, sometimes catching a little bit on a burr on the first lip on the axle.
I usually give them a gentle rock side to side as it goes on.
When you say 'all other diagnosis has come up with nothing', have you had the physical timing checked by pinning the crank at TDC and slotting the tool in the cams?
I seem to remember your other thread where you mentioned the manifold pressure being around 400mbar on idle, rather than the usual...
If it is that yeah, it's part of the bearing.
Usually if it's a sensor, they die and stay dead so the light would be on all the time.
You could swap the sensors from side to side if they are same, I'm not sure on those. Then see if the problem moves to the other side or stays.