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Home >> Mazda >> 2003 >> MX-5 Miata Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1621: Code Word Mismatch After Engine Cranking >> Possible Cause
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Possible Cause

Immobilizer system immobilizer unit code reprogram procedure (code word) was not performed correctly after replacing immobilizer unit or PCM.

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