As of 2015, all monitors (except EVAP in certain cases) must be complete in order for a 2000 and newer model vehicle to pass the smog check. Your Toyota Camry will not be able to pass the smog inspection unless the Catalyst Monitor, too, is complete/ready. Emission monitors are internal self tests which your Camry's ECU (engine control unit) conducts to ensure its emission systems are working properly.
Since having repaired the P420 (misfire) trouble code, follow the Toyota Drive Cycle below to get all the emission monitors, including the catalytic converter monitor, ready. Perform the drive cycle at least twice.
How to Perform Toyota Camry Drive Cycle
Begin by: (Make sure you have between 1/4 and 3/4 fuel in the gas tank. The EVAP test will not run while your Toyota has a full tank of gas or the gas tank is near empty). Ensure there are no pending or active trouble codes and that the check engine light is not on.
A. Start the engine and allow it to idle for 2 minutes or more.
B. Drive the vehicle at 40-70 mph or more for at least 3 minutes. Be sure to maintain engine speed between 900 and 3,200 rpm.
C. Stop the vehicle and allow the engine to idle for 10 seconds or more.
D. Drive the vehicle at 25 mph for at least 40 seconds or more. Be sure to maintain engine speed above 900 rpm.
E. Stop the vehicle and allow the engine to idle for 10 seconds or more.
F. Perform steps “D” and “E” ten times.
G. Drive the vehicle allowing speed to fluctuate between 35-45 mph for about 16 minutes.
If readiness status of all monitors do not switch to “complete,” ensure preconditions are met, turn the
ignition switch OFF, then repeat steps “A” through “G.”
Completing the Toyota Camry drive cycle above should set the emission monitors required to pass the smog check. It will not hurt to perform the drive cycle 2 or 3 times before the smog inspection. Take caution when performing drive cycles on public roadways. If you feel you will be unable to complete the driving pattern above safely, seek assistance from a reputable smog check repair station or Toyota repair facility.