VAGtune
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Voltage regulator is faulty in your alternator easy to replace, You will have Partial Consumer Shut-Off errors flagged in BCM and ESP fault on dash after approx 10-15 min from starting engine.
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Your Voltage regulator is faulty and is not sending DFM signal to BCM which is located in the boot. There is plug on the alternator with blue wire u can test that wire between there and Pin 8 at the rear in the plug that goes into BCM. If continuity is OK then is 100% that your voltage regulator is faulty. Easy job to replace.
