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(1999 Pontiac Sunfire)
in Avalon, CA on January 23, 2011
the keys to this car were stolen. the replacement key didn't work.i had to have the ignation replaced. now the Anti-theft system keeps shutting off the car. whats my next step.
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on January 23, 2011
this should help you,
Engineers design the Passlock TM system in order to prevent theft even if the various theft deterrent parts change. The Tamper mode will engage if any of the following components change:

The Passlock TM lock cylinder
The instrument cluster
The powertrain control module (PCM )
If you replace any of the above components, the system will enter the long tamper mode. If the system enters the long tamper mode, ensure that the system completes a long tamper mode cycle. During the long tamper mode cycle, the THEFT indicator will flash for the full 10 minutes . The instrument cluster and the PCM require the full 10 minutes in order to complete the learn cycle. Ensure that the ignition switch remains in RUN until the indicator stops flashing. If you turn the ignition switch before the indicator stops flashing, repeat the long tamper cycle from the beginning

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