Im thinking about buying svt car drove fine. perfect. but the engine light was on. dealer said they replaced the belt, and belt pully. then mechanic told me he let enigne run with out the belt on to see how engine would run? is that possible? then dealer told me the engine code was oxygen sensor. and they cleared it and replaced the sensor. car has new timing belt and pully 2 differnt parts to the pully. how can you tell if valves are bent? will compression test show that the engine is good? and if i drive the car long enough will the engine light come back on. if they didnt install it right? they said they replaced the belt with a slighlty more play. due to the fact they belt that was on there they said was way to tight with no play? what is the correct part number or correct size belt? all help would greatly be appreciated. is a slightly looser belt better than a tighter belt? the car has 69,000 miles on it. i think the dealership is bsing me. not sure.. anyone in the maryland area that might help look at the car before i buy? would greatly be appreciated it. and i will compensate you for you expertise and help on this car.