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Title: Hello Post by: Optimus1358 on December 31, 2020, 09:07:01 AM Hi everyboy and happy new year. Im from Spain and I would like to learn hot to modify my ECU file to fix the P0421 dtc error. My car is an Audi A6 2.7 from february 2001 ecu 4B0907551S. sw 001, and in my localAudi workshop dosent help me bacause my vin is not in the recall list of softwre uddate. Thanks to everyone for help.
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