P0340 KIA - optima 2006

Question

p0340 camshaft position sensor circuit malfunction

p0131 o2 sensor circuit low voltage (bank 1 sensor 1)

p0051 h025 heater control circuit low (bank 2 sensor 1)

can you explain me where i can find those sensors??
i want to change the sensors myself but dont know where the sensors are

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Answer 1

P0340 Camshaft position sensor "A" circuit malfunction (bank 1)

P0131 H02S circuit low voltage  (bank 1 sensor 1)

P0051 H02S heater circuit low (bank 2 sensor 1)

The camshaft position sensor should be repair first before moving to the H02S sensor of either of the banks. For the canshaft sensor bank1 is where cylinder number 1 is located at.