Code came on P1309 so I replaced the camshaft sensor after installing
It code p0340 comes on instantly and runs rough. But when I install the original sensor code does not come on but p1309 comes on after a few miles I already tried two new sensors same
Issue. Any help would be great

 

A bad diode in the alternator will throw up a code P0340 leading you to go after a camshaft sensor when it is the alternator that has the problem.

 

The code that is coming up is p1309 but when I replace the cam sensor I then get a cam code the vechicle runs like crap. But as soon a I out the original back on its fine but comes up with p1309. Would the p1309 be caused by alternator?

 

No , it should not.