Originally Posted by David SSE
Yesterday my ABS and traction control light came on together for no apparent reason. When I restarted the car, they were off and have not come back on again (?) Is this a concern?
When those two specific lights come on together, the first thing to check is your brake fluid level. If there isn't enough fluid in the reservoir to support ABS cycling, you'll get those two warning lights together. (Yeah, it freaked me out when I saw those light up on mine; it was a great relief when the factory manual pointed me to the fluid level as a first step.)
As for why you only got the lights that one time (or just occasionally), you may be just on the brink of triggering the warning light, to the point that it matters what angle the car is tipped at when you park it, as far as whether the internal float will trigger the warning switch.