How do you repair obd2 code p0012 on 2005 scion?

OBD2 code P0012 indicates a problem with the Variable Valve Timing (VVT) system, specifically that the timing is set too retarded. To repair this issue on a 2005 Scion, first check the engine oil level and quality, as low or dirty oil can affect VVT operation. Next, inspect the VVT solenoid and related wiring for damage or clogs. If these components are functioning properly, consider replacing the VVT actuator or the timing chain/belt if it shows signs of wear.