anx_IV__para__99
6.4. For all emission control systems for which specific on-board evaluation tests are conducted, separate status codes, or readiness codes, must be stored in computer memory to identify correctly functioning emission control systems and those emission control systems which require further vehicle operation to complete a proper diagnostic evaluation. A readiness code need not be stored for those monitors that can be considered continuously operating monitors. Readiness codes should never be set to ‘not ready’ status upon ‘key-on’ or ‘key-off’. The intentional setting of readiness codes to ‘not ready’ status via service procedures must apply to all such codes, rather than applying to individual codes.
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Source: EUR-Lex (Cellar) · retrieved 2026-11-10 · Text as adopted (Official Journal); later amendments are not incorporated in this text.