I bought a 2006 Sonata V4 with 106k miles on it 2 days ago from a dealer and everything worked fine. When I got out of school yesterday the speedometer would stay at 0 and the fuel gauge has been fluctuating a bit. Also the odometer is no longer working. Shortly after this the ECS and ABS lights came on. I've read that this could be the speedo sensor but not sure. Any input would be greatly appreciated.