Some times the sensors need a plug and unplug to help remove built up corrosion and the tips a wipe as crud accumulation can affect the reading.
Ah, Yep, forgot that, I think the camshaft sensor relies on a magnet that doesn't work too well if covered in crud.
@lynx started
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Some times the sensors need a plug and unplug to help remove built up corrosion and the tips a wipe as crud accumulation can affect the reading.