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WRITEUP: 2.7T Secondary Air Injection SAI Pump rebuild

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Old 04-15-2017, 01:59 PM
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Originally Posted by 05AudiAllroad
Repairing the Secondary Air Injection pump squeal, low and behold i cracked the Vacuum Check Valve (X 078-611-933-B) which is off of N249. Will the car run without it? should I replace it or delete the N249? If I delete the N249 will it throw codes?
Well, there is one way to find out. Run it without the valve and see if it throws codes. If it does, you will need to buy a replacement. (I'm betting that it does.)
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