A few years on this post but felt it was worth updating with my fix. A little back story. Light came on. Looked like actuator had jammed. When you turn off the car the actuator moves back and forth. It was struggling. Moving about 10mm or so. Should be 30-40mm. Can’t buy the actuator on its own so a new turbo it was. Apparently the actuator is part of the turbo. When it arrived the actuator was on the wrong way around for packaging purposes. So it was turned around proving they can sell separately. Anyway, 23 months later the fault reappears. I tried spraying the point where the wastegate is with penetrant and wiggling it and it worked for a few days. But the day it was going for an MOT it went into limp mode. So I decided to focus on the elbow of the actuator as when I moved the wastegate I could feel it wasnt jammed. I was pretty aggressive with it. Anyway, MOT passed and 1,000 miles later the fault has not returned. I’m not saying this will work everytime but it’s worth a shot before wasting money on a turbo that isnt needed. In a nutshell, lube and wiggle the elbow and get it moving solved my problem.