What does code P1604 mean on Mazda vehicles?
The ECU detects an immobilizer system malfunction preventing engine start.
OBD-II Code Mazda
P1604 — Mazda — Immobilizer System Fault
The ECU detects an immobilizer system malfunction preventing engine start.
Common symptoms
- No start condition
Possible causes
- Key or immobilizer module issue
Initial recommendation
Inspect immobilizer components and reprogram keys if required.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine Mazda code P1604 with your vehicle's actual symptoms for more complete diagnostic guidance.
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