[lox]

Hey guys. Got a 2016 BMW M235i (N55) here, low on power/throttle response.

Getting error code: "135808 - Valvetronic servomotor position sensors, electrical, open circuit, shortcircuit: Malfunction".

Followed the test plan in ISTA+ which suggested to check and replace the servomotor and/or wiring harness.

So far I've replaced the servomotor (which has the built in hall effect position sensors) and checked continuity of wiring harness back to DME (pin 1 to pin 1, pin 2 to pin 2, and so on, as well as pin 1 to pin 2, pin 1 to pin 3, and so on - so I'm fairly confident there are no breaks or cross-wire shorts inside the harness) - but still getting this error. No signs of water/oil ingress to harness.

Eccentric shaft seemed to move smoothly and easily when I replaced the servo motor.

Suspecting a faulty DME, but this is a big expense to follow through on a hunch. Not sure how much further I can take my troubleshooting before concluding?