Atomspheric pressure sensor is used to detect the change of barometric pressure that alters the intake air density, resulting in improper air-fuel ratio. To compensate this deviation, the amount of fuel injected is controlled. For example, the amount of fuel injected is decresed to compensate for the lower intake air density caused by the Atomspheric pressure sensor is located in the ECMdecreased barometric pressure.(high altitude) In case of the barometric pressure sensor failure, the engine symptoms will occur as follows. Barometric pressure is fixed value of 900 hPa by ECM when the boost pressure and the barometric pressure sensor are defective at the same time.

If an extremely low or high altitude is being read by the barometric pressure sensor during two driving cycles, this code will be set .