You will not let run the car when the car engine has any problem and the car should be checked by an automobile engineer. The car engine P1406 Code is found from the car engine. Check your choke plate and know the positioned correctly. If you need to fix the car choke plate and check the powertrain. If the problem is very serious or not, it is not a matter. You can fix the powertrain problem without changing the part from the car engine and you do not need to add any parts for fixing the car engine. Make sure that the car engine is fully ok when it is fixed.