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Discussion Starter · #1 ·
I installed a high flow cat on my 2011 A5. Was downloading Integrated Engineering stage 2 tune when laptop started updating when the rewrite was at 64%. Tried to run again and kept getting error messages. Now car won't start. Does anyone have any advice? Would much appreciate it. Thanks
 

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You could also try disconnecting the battery and leving off for an hour or so to drain all power...then connect again and see if it works. Not sure if the ecu has a backup flash it will revert to.

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