How to fix a P0068 engine code: MAP/MAF – Throttle Position Correlation
The MAP (Manifold Absolute Pressure) sensor measures engine manifold pressure.
A MAF (Mass Air Flow Sensor) measures all airflow into the engine.
Depending on the vehicle there can be variations on which sensors are used.
For example, some vehicles do not use a MAP sensor but only use a MAF sensor, while some vehicles have a MAF and MAP sensor.

How To Test MAF Sensor Video
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Possible Causes of a P0068 Code:
Faulty or Dirty Throttle Body
Bad MAP (Manifold Absolute Pressure) Sensor
Bad Intake Air Temp Sensor
Bad or Dirty MAF Sensor (Mass Airflow Sensor)
Vacuum leak
Bad Throttle Position Sensor

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