Dirty MAF Sensor with Rich Additive Fuel Trim - Diagnosis and Cleaning

Commonly, a dirty or bad Mass Air Flow sensor is believed to lead to a lean condition. However, my experience is that it’s more likely to lead to a rich condition at idle. In this video, I compare STFT and LTFT before and after cleaning the MAF sensor.
Video based on my blog: drjlt.com/arti...

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Thank you for your contribution. Which millage would you suggest to look after nowadays if I want to buy s500 w220 gasoline? Up to 300k km?