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.