A4 Quattro Wagon L4-2.0L Turbo (CAEB) (2009)
Air Filter Element: Service and Repair
Air Filter Element
Removing
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Separate electrical connector - 1 - from MAF sensor (G70).
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Open hose clamp - 2 - on air duct hose to turbocharger and pull it off at MAF sensor.
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Remove all screws - arrows - from the air filter upper section and remove it.
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Remove old filter element.
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.
‹› Hose connections and charge air system hoses must be free of oil and grease before installing. When installing, do not use any lubricants
containing silicone.
‹› The air filter housings must be absolutely clean.
‹› Secure all hose connections using hose clamps appropriate for the model type.
‹› Note the following when blowing out the air filter housing with pressurized air: To prevent malfunctions, cover the critical air flow components,
such as MAF sensor, air intake tubes, etc., with a clean rag.
‹› Observe disposal regulations!
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Clear water drain - arrow - in air filter housing with compressed air.