I have a 2003 P5 and am experiencing the same problem that I have seen others post about here in the past - ABS and parking brake lights on at the same time. I performed the diagnostic that was also posted but am getting codes that I can't find anywhere (actually, according to some, don't even exist[:-]). I re-ran the diagnostic test a number of times and keep getting the same results. Anyone know what code 34 & 71 represent??
Thanks!

 

I found out what code 34 is. RR solenoid valve, ABS motor or RR ABS wheel-speed sensor/sensor rotor. out of this jumble of things that could be bad you should check the speed sensor & reluctor ring it reads. this code results from the rr wheel locking up during abs operation. do you have stock tires/ wheels & or brakes. is the brake adjustment tighter on that side than the other? this may cause the brake to apply sooner than the other side & lock up or slow down more than the other & set the code.
& yes there is no code 71 for the abs system that i can find.