Mechanic Special Code P0306

2013 5.7 Hemi 1500 RT. Clean title in my name. 7k o.b.o. Backup camera, remote start, 2 subs and amp under rear seats. New suspension, wheel bearings and premium oil change 2 weeks ago, New all terrain tires and rims plus alignment, exterior 8 out of 10 with small scratches. Interior 9 out of 10, just need seats to be washed. Brakes and rotors still in good shape, spark plugs changed 8,000 mi ago. Driving home from Arizona and the check engine light came on, I'm told it's code p0306 and could be a number of different things. It's been good to me for over 4 years and over 40,000 miles, I don't need a truck this large anymore so my loss is your gain. Not a smoker, did clay bar polish buff and wax one month ago. 158,501 on the dash. Please consider $2,000 for suspension and $2,000 for rims and tires alone before shooting your offer. Thank you very much have a great day It drives fine it just has the hemi tick