Your Lexus E300 must have all of its emission monitors READY or COMPLETE in order to pass the smog test. Emission monitors (also known as Readiness Flags) are internal self tests which your Lexus E300's ECU (engine control unit) conducts to ensure its emission systems are working properly.
Typically driving 200-300 miles in both city and highway traffic conditions is sufficient to complete the emission monitors. However at times, a vehicle owners driving patterns do not match those required for the emission monitors to run; and performing the drive cycle's specifics driving pattern is required.
How to Perform Lexus E300 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 Lexus 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. Begin the drive cycle after a Cold Soak. A cold soak basically means, let the vehicle sit overnight. The two important things to remember are... begin when the engine is cold, and make sure you have only 1/4 to 3/4 tank full of gas at all times during the drive cycle.
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 Lexus E300 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 Lexus repair facility.