Car won't shift into overdrive. Told that any gear could be next to go. After 6 months, 1st gear starting to slip. Engine light and traction control lights both came on at once. Apparently these 2 lights come on together for various reasons, o2 sensor, etc. Internet search shows many similar complaints and equal number fixes. My best guess is solenoid went bad. Need to open tranny to replace and may as we'll rebuild it at that point. About $2000. Car has 140,000 miles.