hi all i bought a 2002 ford focus st170 last week from a dealer, i put it on a diagnostics machine today and the code p1518 came up, i looked on the dash and there was no light on so took it out and the dealer must have took the bulb out so obviously when i put a bulb in the engine managment light stays on, can anyone help with this as i have just bought the car and dont want to fork out more money