The powertrain problem of the engine is general and minor problem and that engine P0439 Code has come for the engine is tested. Do not drive the car with the minor or major problem in the car engine. You should not allow any wrong meaning or automobile dictionary meaning for solving the car engine. Some problems of the car engine may be very serious and those problems may start new problems in the car engine. However, you should fix the car as soon as possible. You should hand over the car to professional automobile engineer for solving the car. Before lastly accept the car, a test drive is recommended.