Home >> BMW >> 2012 >> 535xi >> Repair and Diagnosis >> Engine Performance >> System >> Self Diagnosis - N55 - Diagnostic Trouble Codes - DTC P1638 (BMW DTC 100001) Through DTC P10EB (BMW DTC 10BA41) >> DTC P1634; BMW DTC 107A80: Throttle-valve actuator, closing spring check: abort check, spring does not close >> Fault code