does it make a very loud valve noise?
I lost power, the engine light, the oil light came on, but there was plenty of oil in the truck.
P0340 Camshaft position sensor circuit malfunction
When this code occurs there is not a loud noise, there is no noise just a drivabilty problem where you know and feel that something is wrong.
This would be a loud noise problem, you need to investigate the noise problem , you going to deal with a mechanical problem
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