Sebastian77 Posted 18 hours ago Posted 18 hours ago Hi. A6 C7 Ultra 2.0 TDI.2016. Under heavy acceleration the glow plug light comes on and goes into emergency mode. Resets during the ignition cycle. Could anyone help me to sort this problem. P029900 Coolant pump for charge pressure cooler, OPEN CIRCUIT. 0x00646E unknown fault code
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