BMW E90 318d (2009) ABS Sensor Test 

They must use a different protocol.

@@billebrill8730 Yeah, it's probably this one, ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-9rPjL9PEK2g.html although I was not able to see the square wave. Maybe. I would have to do it installed on the wheel. Cheers.

@@dzidmail That was how I started unfortunately it is uses a current sensor arrangement. It is not a voltage protocol, it is a current protocol, switching current levels and difficult to detect with a scope.

@@billebrill8730 Actually yeah. This is must be the same protocol. Although, with the 200ohm resistor in series the voltage drop changes (1.4V) should be visible on the scope. I think, either my new sensor are bad too or I need different metal to test them on.

Let me report my memories - maybe will be useful to someone. Your sensor is showing 14mA on far proximity and 7mA on close. My failed rear sensor one was showing 7mA on far and close proximity. Replacement rear sensor was behaving like yours 14mA on far proximity. Now, week later front sensor started reporting error. Yeah, suspicious. It was reading 7mA on far and close proximity. Bought the replacement and was showing correctly 14mA on far proximity and 7mA on close, they sent wrong size (thick rear kind). Then I ordered two Chinese front sensors from different manufacturers. I thought I will stock up on them if another one fails. Both were showing 7mA on far proximity, so they are probably failed as well. They costed $8 and $10 and they are probably some manufacturing rejects. I am going to buy another one and maybe will report further.