Air Filter Element: Service and Repair

Air Filter

Removing

- Disconnect the connector - 1 - from the Mass Airflow (MAF) sensor (G70).

- Open the hose clamp - 2 - on the air duct hose to the turbocharger and pull it off at the MAF sensor.






- Remove all screws - arrows - from the air filter upper section and remove it.

- Remove the 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 is very dirty or soaked, dirt particles or moisture may have contaminated the MAF sensor and may be causing false mass airflow values. This results in a reduction of power, since a lower injection quantity is calculated.

• Always use an original air filter.

• 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: Parts Catalog.

• Note the following when blowing out the air filter housing with pressurized air: To prevent malfunctions, cover the critical airflow components, such as the MAF sensor, air intake tubes, etc., with a clean cloth.

• Observe disposal regulations!

- Clear the water drain - arrow - in the air filter housing lower section with compressed air.






• Ignore items 1, 2 and 3.

- Clean air filter housing (upper and lower sections) of salt residue, dirt or leaves (use vacuum cleaner if necessary).

- Check the MAF sensor and air duct hose (intake air side) for salt residue, dirt, and leaves.

- Check the air duct from lock carrier to air filter housing for dirt and leaves.

- If equipped, reconnect the vacuum hose to the intake air switch-over valve (N335).

- Make sure that air filter is properly centered when placed in the mounting of the air filter housing lower section.

- Set the upper section of the air filter housing onto lower section of the air filter housing, without using much force. When doing this, make sure that the upper section of the air filter housing is not placed crooked onto the air filter (observe sealing lip of air filter).

- Make sure the air duct hose is securely seated on the MAF sensor.

Install in reverse order of removal.