Most dealerships will do anything they can to avoid warranty work on a modified vehicle. Your code is most likely not related to the intake, but they could say it is, and most likely will:
Quote:
P0300 may mean that one or more of the following has happened:
* Faulty spark plugs or wires
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector(s)
* Burned exhaust valve
* Faulty catalytic converter(s)
* Stuck/blocked EGR valve / passages
* Faulty camshaft position sensor
* Defective computer
|
Do you have an exhaust on the car as well? It could be caused by other mods to the vehicle that you didn't specify. Or it could be totally random - sensors go bad sometimes. It happens. Mybe you bumped something. 1000 miles is a long time for something to pop up.