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.
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
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Shock Absorber Leaks
Vehicles with Coil Springs
Shock absorbers are frequently rejected and replaced because
of leaks. Examinations on the test stand and on the vehicle have
shown that the replacement of a large number of rejected shock
absorbers was not justified.
Slight leaking of oil ("sweating") at piston rod sea
