My new-to-me R56 has the cluster lit up with ABS issues and is throwing a CEL (P0503) related to a speed sensor issue. My first inclination is to think that it's a wheel speed sensor issue. Before trying to replace sensors at random, I figured I'd try to see if there was a particular sensor that was showing an issue. I tried reading the ABS with the C110 Creator scanner that I recently acquired, and it's complaining about a communications error. That leads me to believe that the issue might be a bit more involved. I've never used this scanner before, though, and it not communicating may be a red herring. Can anyone confirm that theirs does work when trying to connect to the ABS and read the data stream?

Any other ideas for what I could try to narrow it down a bit before giving in and taking it in to the shop?

 

My carsoft 910ii reader does the same. Search here or google that code to see which sensor it it.

It is good to invest in INPA.

 

Thanks! That gives me hope that it could indeed simply be a wheel sensor. INPA cable ordered yesterday, as well.