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Code

P1570

VW immobilizer

Engine start blocked by immobilizer

The immobilizer is blocking the start (VW/Audi).

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Most likely causes

Key not recognized
Failed immobilizer reader
ECM/immobilizer mismatch

Symptoms you may notice

Engine cranks but will not start
Flashing key warning

Checks to run

Try the second key
Read immobilizer codes
Check the key reader

Tools you may need

OBD-II scanner

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

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