Waze announces “turn left” vs “keep left” based on how that particular intersection is drawn on the map. The map is drawn by ordinary community editors, like you and me. Well, maybe not you yet. The next time you have this problem, log on to Waze.com and change it!

Actually, for like $10 you can pick up an obd2 Bluetooth connector that beams codes and lots of other real time data straight to your phone.