PSM & ABS warning lights come on at 50mph
 

996 cabrio on year 2000 - anyone know what this could be and how much to repair?

RE: PSM & ABS warning lights come on at 50mph
 

Do you have a check engine light? Usually PSM and ABS lights come on with a bad Maf sensor ($300+), but they can also come on due to a bad brake light switch, and a few other things.