2017 Subaru Levorg 1.6L Petrol · BJ17 YHM

The Lineartronic high-torque CVT relies on electro-hydraulic solenoids inside the valve body assembly to modulate hydraulic line pressure and torque converter lockup. Between 60,000 and 100,000 miles, internal solenoid coils (most commonly the lockup duty solenoid) can suffer open circuits or out-of-range electrical resistance. This causes the transmission to enter limp mode, illuminating the AT Oil Temp, Check Engine, and Vehicle Dynamics Control warning lamps. Specialist repairers can replace individual solenoids or fit a refurbished valve body without replacing the entire gearbox.

The 1.6-litre turbocharged FB16 engine features direct petrol injection without intake runner port wash. As crankcase blow-by gases from the PCV system cycle through the intake manifold, carbon deposits bake onto the backs of the intake valves and ports, typically becoming restrictive around 50,000 to 80,000 miles. The restricted airflow causes cold-start rough idling, stuttering under boost around 2,500 to 3,500 rpm, and reduced fuel efficiency. Walnut shell blasting restores factory performance.