Question

2009 Scion TC 2.4L with engine code P0300 and P050B, no symptoms match my car. None of the symptoms match my car my code comes upon an obd2 scanner as a readiness DTC code no lack of power no check lights no motor hesitation and no hard start what else could cause this

Answer 1

P0300 Random misfire

Readiness code, Readiness is not any code at all these would be for emission inspection this is the   comprhensive readiness.

Answer 2

P0300 SCION - Random Cylinder Misfire Condition
Read more: https://www.autocodes.com/p0300_scion.html

P050B SCION - Cold Start Ignition Timing Performance
Read more: https://www.autocodes.com/p050b_scion.html