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Having same issue. Went from 411 to P59 PCM for Flex Fuel and cruise control not working. 2002 Camaro 5.7 A4.

Did anyone get the Flex Fuel to work with P59, F-body, 2004 GTO file with 12587604? Getting O2 heater DTCs and FF alcohol content is not working.

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Did anyone get the flex fuel to work with the P59 PCM in an F-body? Having the same issue; O2 heater DTCs and not reading alcohol content. 2004 GTO file. OS: 12587604.