Yep, the manual does include full step-by-step instructions for removing and reinstalling the valve cover, and it’ll walk you through the process of checking the Valvetronic system too — including inspecting the motor, eccentric shaft, and sensor setup.
I recommend checking this 👉🏻 2010 BMW 118i (E87) 1 Series OEM Download Service & Repair Manual Software.
Losing torque and seeing that injection light usually means something’s not right in the Valvetronic or one of its sensors — common on those N46 engines in the 118i. Could be a stuck eccentric shaft or a bad Valvetronic motor. The manual can help you tear it down properly and reassemble it without snapping any bolts or messing up the gasket sealing.
If you’re doing this at home, just take your time with the torx bolts and be sure to follow the tightening sequence when you put the cover back on. The manual shows that too.
Good luck!
