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Home › Mazda › 2003 › MX-5 Miata Base, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P1604: Code Word Unregistered In Pcm › Possible Cause

Possible Cause

Immobilizer system reprogram procedure (key IDs) was not performed after replacing PCM.

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