[00 Deville]

High octane gas won't cause you any problems... was just trying to save you some $$$. The 2000 and later N* engines will run fine on regular gas.


P0327 = Knock Sensor Circuit Low Voltage

P0152 = HO2S Circuit High Voltage Bank 2 Sensor 1

These are the codes that caused the SES light to come on. Since you just bought the car I would wait for the dealer to call you back to see what they want you to do.