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Troubleshooting a bad MAF Sensor for a 1999 VW Passat, 1.8L Turbo. The sensor failed at the same time we were replacing a fan speed switch, and we broke a Vacuum check valve trying to find the problem that night. In the end it was the MAF sensor.
I have another video that shows in detail how to change the MAF sensor, so this one is more just the story of diagnosing this problem.