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12/14 p85D top speed

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I had the exact same issue, was limited to 132 for some strange reason, with no red number. Now I have hit 153 in red font as my best. If the speed sensor is current you might need a new drive unit. It took my service center several tries before they finally resorted to replacement, which fixed the issue...
 
I’ve had mine up to 240kmh (150mph) on the Autobahn. I’m not a fast car expert but it was very stable and very smooth. No shakes or vibrations of any kind, just totally planted. But is consuming power like hell at that speed and god knows what it’s doing to the tires.