Originally Posted by StartX5

Experience with my 528i at 150K: SES light on and it was so annoying me.
SES light can gives you ton of problems. It's not only transmission nor sparks it can be thermostat, coolant horses, waterbump, engine belts .... and so on. When it happened, i used ODBII code reader and scanned it. It gave me serveral errors in the engine. I wrote down all error codes and trying to see what these codes stands for. After investigated all errrors i bring to my friend at indy shop. He found out exactly what i used cheap ODBII scanner:
1. Thermostat
2. Engine Belts
3. Air Filter
4. Replace Sparks (second time)
5. Engine Oil Change
6. Oil Services

After all services completed, the SES ligh disappeared and it has another 75K totally 214K at them time i was selling it.