I have a 2000 Hyundai Accent ... front end shakes, squeals in cold weather and squeals when a/c is on. i went over a bump on the highway going about 70 and the engine light immediately came on.. i went to autozone and the print out read fron sensor or lean small leak. i changed the front sensor but light is still on and now i hear a loud sound when i press gas like a muffler sound.