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This must be totally off because I know nothing about the tiptronic, but this story reminds me when the shifter position sensor, a.k.a. the neutral safety switch in my SAAB went out. The engine wouldn`t start in P, only started in neutral. It worked, I used the car like that for a couple times, but sometimes the car was sluggish and was hardly moving in gear. The sensor was not able to detect the selected gear reliably and confused the control unit. So maybe the seal failure is not the root cause but the consequence of something else? Just a thought.
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