It seems that the engine code P0137 is a kind of powertrain problem. However, this problem is not very difficult to solve. You may not need to change any component from the car engine. This problematic car engine can be solved like the all engines where powertrain problem is found. The car engine method employs particularly established hydraulic lifters which is known as switching roller followers for the P0137 code intake and finish valves. The lifters can be distorted by disengaging an inside locking pin. The locking pin is disconnected using solenoids to adjust oil heaviness fed into the lifter.