Sooner or later all these fixes will no longer work and you just have to replace the speed sensor on your Boschh cx performance line like I did. Make sure you buy the correct crank puller. I used the universal one from ParkTool. Removing the motor and replacing the sensor wasn't difficult, although it did take a little time. If you're clumsy like me, an hour at the most. That's all. Since then there hasn't been a single error code 503. I also use a Speedbox 3.0 chip. There are no problems there either. Definitely recommend.
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