I get the dreaded ABS/DSC/TPS light trifecta occasionally whenever the temperature gets over 80 deg F, and pretty reliably when it goes over 90 deg F. This is on a 2003 Cooper S that has the 4 separate ABS sensors. I've lived with it for a few years now. Yesterday I cleaned out the front left and rear left, both of which were a little dirty, the lights went out in the cool of the evening but unfortunately came back on today.

Any thoughts on whether I should now clean out the right hand side? I've read that cleaning is a pointless activity so I was just doing the left side to see if it would work. Or should I just start replacing parts? I need to get this fixed as my daughter is now going to be driving the car and the ABS doesn't work properly when the lights are on, making this a safety issue that I'm no longer willing to live with. Is it worth getting a Peake scanner to pinpoint which sensor it is? The last time the shop looked at it all 4 sensors were reporting some kind of error codes, though the lights weren't on at the time. Is it possible it is something other than a wheel sensor?

 

I had the same issue on my '06 MCS. The trifecta lights came on whenever the temperature hit 75ish degrees or above. I also lived with it for a while before it really started annoying me. It turned out to be a faulty wheel speed sensor. Once replaced, everything was fine. You'll have to take it to a dealer or find a shop that has the proper scan tool that can read BMW/MINI specific fault codes to find it which sensor is faulty. My opinion is that cleaning them is a waste of time.