Cam shaft sensor

I bought a car from Bizzaro's 8/5/14, and it has turned out to be a huge mistake. As soon as I drove off the lot the car had two lights come on. One was check engine, and the other was EPC. At first I wasn't too concerned because Bizzaro's gives you a warranty with the vehicle. Long story short - Bizzaro's claimed to fix it 3 times, but each time all they did was reset the dash lights. Every time the lights came back on within 15 miles of driving it. Eventually, john the mechanic admitted to not knowing how to fix the car, and they told me to take it somewhere else.