A4 Quattro Wagon L4-2.0L Turbo (CAEB) (2009)
Air Flow Meter/Sensor: Service and Repair
Mass Air Flow Sensor
Removing
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Separate electrical connector - 1 - from MAF sensor.
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Open hose clamp on air duct hose to turbocharger and pull it off at MAF sensor.
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Remove both bolts from MAF sensor.
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Carefully pull MAF sensor out of the guide from air filter housing.
Installing
For problem-free operation of the MAF sensor it is very important to observe the following notes and procedures.
‹› If the air filter element is very dirty or soaked, dirt particles or moisture may have contaminated the MAF sensor and may be causing false mass air
flow values. This results in a reduction of power, since a lower injection quantity is calculated.
‹› Always use an original equipment air filter element.
‹› Use a lubricant (silicone-free) for installing the air duct hose.
‹› Secure all hose connections using hose clamps appropriate for the model type.
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Check MAF sensor and air duct hose (intake air side) for salt residue, dirt, and leaves.
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Check the intake ducting up to the air filter element for dirt. If any contaminants are discovered, clean the air filter housing (upper and lower
sections) of salt residue, dirt and leaves (if necessary, clean by washing or vacuuming). Air filter, removing and installing. Refer to => [ Air Filter
Element ] See: Fuel Delivery and Air Induction/Air Cleaner Housing/Air Filter Element/Service and Repair
Further installation is in reverse order.