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To reset the PCM (Powertrain Control Module) on a 1999 Saturn, disconnect the negative battery cable and leave it disconnected for about 15 minutes. This allows the PCM to clear any stored trouble codes and resets its adaptive memory. After that, reconnect the battery cable, and your PCM will be reset. It's also a good idea to drive the vehicle for a while to allow the PCM to relearn its parameters.

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