2015 VW Golf P0642 - Sensor Reference Voltage “A” Circuit Low" - FIXED 

I had a skoda yeti with this problem. There is like 2 map sensors. I switched them to see if the problem would go away. The turbocharger was faulty. This video helped me! With finding it where it came from! Thank you very much

The 5v ref is a series circuit inside the ecu, but parallel outside, so even if you test one 5v ref circuit outside the ecu and disconnect it the other 5v ref circuit is pulling the 5v down, because it's a shared circuit inside

Does cars has 2 map sensors. I have that same sensor on a 2013 Ford f 150 Ecoboostm making pap pop noises when I accelerate.????