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What happens with a 1999 vw passat bad mass air flow sensor?

Problems caused by a bad MAF sensor:

- The car may hesitate or stall when idling

- The car may run rough at low speeds or when accelerating

- The car may hesitate or jerk when shifting gears

- The car may have decreased power or fuel efficiency

- The car may emit black smoke from the exhaust

- Check Engine light may come on

- Vehicle may fail emission testing