Audi A4 Owners & Service Manuals

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-.

A24-11664

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.

    READ NEXT:

     Engine Control Module

    Overview - Engine Control Module 1 - Bolt 9 Nm 2 - Mount For the Engine Control Module -J623- 3 - Engine Control Module -J623- Before replacing perform the "01 -

     Exhaust System, Emissions Controls

    Exhaust Pipes/Mufflers Overview - Muffler Overview - Muffler, FWD Vehicle 1 - Retaining Loop Replace if damaged Exhaust system, installing without tension. Refer to → Chapter "Exh

     Heating, Ventilation & Air Conditioning

    SEE MORE:

     Coolant Pump, Removing and Installing

    Removing - Remove the engine cover. Refer to → Servicing - 4-Cylinder 2.0L 4V TFSI Engine; Rep. Gr.10; Engine Cover; Engine Cover, Removing and Installing. - Drain the coolant. Refer to → Chapter "Coolant, Draining and Filling". - Disconnect the connectors -

     Floor Heat Shield, Removing and Installing

    Plenum Chamber Bulkhead Heat Shield, Removing and Installing Removing - Remove the plenum chamber bulkhead. Refer to → Chapter "Plenum Chamber Bulkhead, Removing and Installing". - Remove the lock washers -arrows-. - Remove the heat shield -1- from the plenum chamber bulkhead

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