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Message: <blockquote data-quote="oligokoko" data-source="post: 349211" data-attributes="member: 14920">camshaft sensor can be checked by visual inspection. just loosen the allen key screw (size 4 if im not mistaken) and remove it from the engine head. the old camshaft sensor is plainly rounded and d cylinder part equal in diameter from d base till end. the new version, the cylinder part have 2 diameters, larger diameter from the base n then it will shrink abit till d end.to know d camshaft sensor fault, usually by diagnose or by revving the engine. u can actually feel d revving picking up slowly n sumwhere around d higer range of revving (4k++), the revving will become sluggish n in some cases d engine will vibrate slightly compared to normal operation. just for reminders, engine will have vibrations when high revving, but for d camshaft sensor fault, it will vibrate slightly more.another symptom is when u start d car (usually in cold start), the engine will start n after idling for a few secs, it will dies off by itself. be adviced tht both symptoms usually address to a faulty comshaft sensor. it can also b a faulty valvetronic motor, valvetronic motor lost its initial reference point, clogged oil separator, oil sludges, air leak, faulty ignition coil etc etc etc. have a specialist 2 check ur car when these symptoms occur. n also give them ample of time 2 troubleshoot.</blockquote>