ABS / ASC light, another thread!

I've searched and read pretty much every thread on this topic and concluded that I needed to replace/repair the ABS module on my car.

The symptoms prior to the repair - ABS/ASC light on, speedo/mpg working intermittently and eventually turned off all together, cruise control not working and tranny going into limp mode from time to time.

I check the sensors and find out the rear left sensor is simply not there, but the car had been working fine with no errors for 2.5+ years of owning it to this point.

I go ahead and get the ABS module repaired, and it came back yesterday. I put it in and now the speedo/mpg/cruise/tranny all work like normal, but the ABS and traction light are on. I'm thinking that this is a result of the sensor being missing all together on the rear left wheel. Does this sound reasonable? I don't really care for paying BMW $130 to plug it into the computer so they can sell me a $80 sensor that may or may not work.

Additionally, if it is the missing sensor (even if it isn't because I'm probably getting one anyway), where does it plug into? Not the brake pad part, the other end

Thanks,
Dave
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