S4 Fully Updated Goes into Limp Mode
#1
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I have a 2000 S4 with full stage III RS4 upgrade, package originated from ECS Tuning, APR software. The car's power is randomly cutting out completely back to limp or stock performance. Nobody seems to have answers. One minute you are over 400HP and the next it is cut in half. It is not the N75 valve, I swapped it with my 2.7 A6 and the problem remains. Any ideas????