i have already replaced the Oil control valve and after a month it re-ocured again !!

Question

after i changed the Oil control valve it worked properly and the check engine is turned off, after a month the same error code appeared again.

Answer 1

P1349 VVT system malfunction

The variable actuator is what causes a P1349, Code like P0016, P0011. P0018. you can be sure this is the solenoid that the cause, But for P1349 this is the actuator .