Toyota 1 MZ–FE Manual page 536

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EG2–536
DIAGNOSTIC CHART
Are there any other codes (besides DTC P0420)
being output?
Check heated oxygen sensor. (See page EG2–476).
Replace three–way catalytic converter.
1MZ–FE ENGINE
CIRCUIT INSPECTION
YES
Go to relevant diagnostic trouble code
chart.
Repair or replace.

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