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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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