You have a gas vapor leak, which is what P0440 means. This link and my post in the link should help.I own 2001 is300 and the cel is on as well as the trac off is flashing. I was able to get codes from a failed smog. P0440, p1120, p1121. I have looked them up but don't know how to start fixing them. My car will drive fine for awhile but then it seems like I have to floor the pedal for the car to go any faster. Help on this would be great.
Check the gas cap, replace if needed. Check the VSV tubing connections near where the stock air box sits.
Both P1120 and P1121 tells me the accelerator pedal position sensor is bad or the wiring to it. P1120 is the accelerator pedal position sensor circuit malfunction, and P1121 is a range/performance problem detected with the APPS. It's part #22060 in the pic below. Toyota part # 2206046070 THROTTLE W/SENSOR LEVER ASSEMBLY. You may be able to find a used one on Ebay or junk yard.
2002 IS300: OEM Engine & Fuel (FUEL INJECTION) Replacement Parts