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Home >> Toyota >> 2015 >> Prius One >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Control System (Diagnostic Codes (P0300-P0657)) (Except Plug-In)) >> SFI System >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) [08/2014 - ] >> Catalyst Location
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Catalyst Location

WARNING: This page is about a different variant/trim than selected.
Fig 1: Identifying Exhaust Heat Recirculation System
GTY339684Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
TEXT IN ILLUSTRATION

*A w/ Exhaust Heat Recirculation System *B w/o Exhaust Heat Recirculation System
*1 Air Fuel Ratio Sensor (Sensor 1) *2 Exhaust Manifold Sub-assembly
*3 Front Exhaust Pipe Assembly *4 Heated Oxygen Sensor (Sensor 2)
*5 Tail Exhaust Pipe Assembly *6 TWC: Front Catalyst
*7 TWC: Rear Catalyst - -
NOTE:

When replacing the front exhaust pipe assembly in order to replace the three-way catalytic converter, it is not necessary to replace the heated oxygen sensor.