I checked the codes the other day and this is what it had P0541 Intake air heater relay1 low and P0073 Ambient tempature senser high does anyone know what these codes mean.

 

541 means there was an open circuit in the wiring to one of the grid heater relays (the relays are located on the pass side battery tray).

073 mean a there was a short circuit somewhere in the wiring for the ambient air temp sensor (sensor is on top of the airbox). That is a combination air temp and air press sensor. Usually when the sensor fails, you'll lose both (not just air temp like in your case). Usually when just one side (press or temp) fails, its because of the wiring (or that particular ECM driver ciruit or ECM connector pin ).