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BMW 3 Series N52 Engine Idle Sometimes Unstable Fault Code DME Air Quality System
The idle speed of BMW 3 Series N52 engine is sometimes unstable. DME air quality system fault code. This is a typical dirty throttle, which leads to uncontrollable intake and unstable idle speed. Cleaning the throttle can solve this problem. The specific operation steps are as follows:
1. Remove the throttle hose.
2. Open the throttle.
3. Clean with a brush.
4. Spray with detergent.
5. Replace the hose and it's done.