BMW 330Ci check engine light flashing with codes P1634 and P16A1 on BMW 330Ci

Some BMW 330Ci owners report experiencing issues indicated by a flashing check engine light, specifically codes P1634 and P16A1. The P1634 code suggests a failure in the throttle valve adaptation system, potentially leading to engine performance and idling problems. Additionally, the P16A1 code generally points to a fault in the engine or emissions system, though specifics may vary by model. To address these issues, owners are advised to pull Diagnostic Trouble Codes (DTCs) to identify the triggering sensor or component, inspect the throttle valve system for faults, and conduct an intake system smoke test for leaks. If these steps do not resolve the problems, seeking assistance from a qualified mechanic or BMW specialist is recommended. Prompt attention to these codes is crucial to prevent further vehicle damage and maintain optimal performance and safety.