LEMON Manuals
: Even more car manuals for everyone: 1960-2025
Home
>>
Toyota
>>
2003
>>
Sequoia SR5, RWD
>>
Repair and Diagnosis
>>
Engine Performance
>>
System
>>
Engine Control System Self Diagnostics
>>
Diagnostic Tests
>>
DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) Or P0430: Catalyst System Efficiency Below Threshold (Bank 2)
>>
Possible Causes
April 5, 2026:
LEMON Manuals is launched!
Read the announcement.
Possible Causes
This DTC uses two-trip detection logic. For DTC detection conditions and possible causes see
Fig 1
.
Fig 1: DTC Detection Conditions & Possible Causes
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002