LEMON Manuals
: Even more car manuals for everyone: 1960-2025
Home
>>
Toyota
>>
2003
>>
Highlander Base, 2.4 D, AWD
>>
Repair and Diagnosis
>>
Engine Performance
>>
System
>>
Engine Control System Self Diagnostics - 4-Cylinder
>>
Diagnostic Tests
>>
DTC P0420: Catalyst System Efficiency Below Threshold (Bank No. 1) & DTC P0430: Catalyst System Efficiency Below Threshold (Bank No. 2)
>>
Circuit Description & Possible Causes
April 5, 2026:
LEMON Manuals is launched!
Read the announcement.
Circuit Description & Possible Causes
For circuit description and possible causes, see
Fig 1
.
Fig 1: DTCs P0420 & P0430 Circuit Description & Possible Causes
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002