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I have passat 2003 my problem the car did not start and show immobilizer activated and battery light on
i replace the battery a week ago but the problem just happen yesterday any one can help me
 

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That is strange. Is the battery defective? Use a voltmeter to check the battery voltage around 11.8 and generator w/engine running, around 14. The immobilizer normally resets if you leave the car on for a half hour or so with the key ig nition.
 
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