I have a 2004 MCS made in September of '03. Had the lights come on a couple of weeks ago so I took my Mini to a mechanic I trust and he diagnosed it as the front left ABS/Speed Sensor. So I ordered the part through him and replaced it myself. The lights went away and everything seemed fine until a couple of days ago when the lights came on again.
Haven't had a chance to take it back to the mechanic to see what it could be. Does anyone have any ideas?

 

I'd make sure that the connection for the sensor you installed hasn't somehow worked itself loose and also make sure it looks as if it's in good condition and isn't damaged. You can also plug in and find out which sensor may be tripping this issue and if it is in fact the same one (front left).

 

I figure I'd piggy back onto this thread. Maybe my info it helps? I have a 2004 and the trifecta light show comes on when I make an extreme hard left turn like going into a parking space. Seems to happen more when its warm out and less when its cold. Sensor, cable, connector? I have not yet diagnosed which sensor but from everything I've read I would guess left front as it seems to be the usual suspect.

 

Was this ever resolved? I'm having a similar issue and checked all the regular suspects to no avail.

 

Yes. It was a bad right front ABS sensor.

 

I have a 2006 MCS and have had to replace the left front sensor twice and right one once in the last month for same reason. Mine was coming with hard left turn while backing.