Audi A4: Sensors

Intake Air Temperature Sensor -G42-/Manifold Absolute Pressure Sensor -G71-, Removing and Installing

All procedures are described under: → Servicing - 4-Cylinder 2.0L 4V TFSI Engine; Rep. Gr.24; Sensors; Intake Air Temperature Sensor G42/Manifold Absolute Pressure SensorG71, Removing and Installing.

Mass Airflow Sensor -G70-, Removing and Installing

Removing

- Loosen the hose clamp -3- and remove the air duct pipe.

- Disconnect the connector -2-.

- Remove the bolts -arrows- and the Mass Airflow Sensor -G70--1-.

Installing

Install in reverse order of removal and note the following:

The following information and procedures must be followed exactly to ensure that the Mass Airflow Sensor -G70- works correctly.

  Note

• If the air filter element is very dirty or soaked, dirt particles or moisture may have contaminated the Mass Airflow Sensor -G70- and may be causing false mass airflow values. This results in reduced performance, since a lower injection quantity is calculated.
• Check the air filter element on the inside of the air filter housing for debris and clean if required.
• Secure all hose connections with hose clamps that match the ones used in series production. Refer to the Parts Catalog.

Tightening Specifications

• Refer to → Chapter "Overview - Air Filter Housing"
• Refer to → Servicing - 4-Cylinder 2.0L 4V TFSI Engine; Rep. Gr.21; Charge Air System; Overview - Charge Air Hose Connections.

Fuel Pressure Sensor -G247-, Removing and Installing

All procedures are described under: → Servicing - 4-Cylinder 2.0L 4V TFSI Engine; Rep. Gr.24; Sensors; Fuel Pressure SensorG247, Removing and Installing.

Fuel Pressure Sensor -G247-, Checking

All procedures are described under: → Servicing - 4-Cylinder 2.0L 4V TFSI Engine; Rep. Gr.24; Sensors; Fuel Pressure SensorG247, Checking.

Low Fuel Pressure Sensor -G410-, Removing and Installing

All procedures are described under: → Servicing - 4-Cylinder 2.0L 4V TFSI Engine; Rep. Gr.24; Fuel Injectors; Overview - Fuel Rail with Fuel Injectors.

High Pressure Pump

All procedures and components are described under: → Servicing - 4-Cylinder 2.0L 4V TFSI Engine; Rep. Gr.24; High Pressure Pump.

Heated Oxygen Sensor

All procedures and components are described under: → Servicing - 4-Cylinder 2.0L 4V TFSI Engine; Rep. Gr.24; Heated Oxygen Sensor.

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