Cam- or Crankshaft sensor ?

Hi,



Based on what I have read I have a faulty CAMshaft sensor.



Sometimes the starter will turn the engine, but it will not ignite. And if I leave it for 30 minutes, it will start like nothing was ever wrong. Happens once a month.



Today it was a bit different. The engine only ignited for half a second or so, but would never remain going. This happended a few times. (and it started again after 30 minutes as always)



As I have read, the CRANKshaft sensor takes over once the engine starts, so I was wondering if that is also broken ?



Or should I just try replacing the Camshaft sensor first ?



Thank you,

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