LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2011 >> RX 450h 3.5 B >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0300-P1423) >> SFI System >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1); DTC P0430: Catalyst System Efficiency Below Threshold (Bank 2) >> Confirmation Driving Pattern
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Confirmation Driving Pattern

HINT: 

Performing this confirmation pattern will activate the catalyst monitor. This is very useful for verifying the completion of a repair.

Fig 1: Confirmation Pattern Will Activate The Catalyst Monitor
GTY356156Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the power switch off and wait for 30 seconds.
  6. Turn the power switch on (IG) and turn the Techstream on.
  7. Put the engine in inspection mode. Refer to INSPECTION MODE PROCEDURE .
  8. Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor.
  9. Check that Catalyst Efficiency / Current is Incomplete.
  10. Start the engine and warm it up (until the engine coolant temperature is 75°C (167°F) or more) [A].
  11. Drive the vehicle at between 40 mph and 70 mph (64 km/h and 113 km/h) for at least 10 minutes or more [B].
  12. The monitor items will change to Complete as catalyst efficiency monitor operates.
  13. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
  14. Check if any DTCs (pending DTCs) are set.

HINT: 

If Catalyst does not change to Complete, and no pending DTCs are set, extend the driving time.