MPG not working properly, need help
 

Electrical gurus needed... My mpg gauge doesn't work and neither does my mpg on the obc in my 318ti. It was working last week but all of a sudden it doesn't work properly. Any ideas what it could be?
I've checked the wiring and it's all intact. My next step was to check for power or signal.
Is the mpg gauge connected to the gas tank signal or speed signal? Cuz my gas tank gauge is working fine and so is my speedometer.

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