Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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IV. Background

In recent months, Toyota has received reports that some customers may experience a Malfunction Indicator Light (check engine light) "ON" condition (P0420 or P0430). Toyota has investigated these concerns and discovered an issue with the program logic in the Engine Control Module (ECM). New program logic has been developed to correct this condition.