Autopapyrus · Volkswagen Polo 1.4 TDI BNM (2008)
https://autopapyrus.com/guides/volkswagen/polo/air-filter-replacement/

Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Volkswagen Polo 1.4 TDI BNM (2008): Air Filter Replacement

On the three-cylinder 1.4 TDI diesel, the filter element sits in a plastic housing in the engine bay. Replacement doesn't require removing any other components. The scheduled replacement interval is about 60,000 km or 4 years, and the filter should be replaced more often if you drive on dusty roads.

Difficulty: Easy Time: 10-15 minutes Steps: 10

Part

№	Part	Alternatives
01	Engine air filter element 1.4 TDI (BNM, 70 hp)	Mann, Bosch, Filtron, Knecht/Mahle

Tools

screwdriver (Phillips or flat-head, if the cover is held by screws), vacuum cleaner or dry rag
to loosen the duct clamp, a screwdriver or socket matching the clamp type

There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Haynes and 15 more. See manuals →

Step by step

10 steps

Shut off the engine, let it cool down, and open the hood.
Locate the air filter housing. It's a rectangular plastic box in the engine bay, with an air duct running from it to the turbocharger.
Inspect the housing cover and determine the fastening type: spring clips or screws. Release the clips by pushing them sideways, or remove the screws.
If a sensor or duct attached to the cover prevents you from lifting it, disconnect the sensor connector (press the locking tab) or loosen the duct clamp. Don't pull on the wires or kink the corrugated hose.
Lift the cover and note the position of the filter element: which side has the sealing lip and the orientation of the pleats.
Remove the old filter. Use a vacuum cleaner or dry rag to remove dust and leaves from the housing and cover. Don't use a wet rag, so that water doesn't get into the intake.
Compare the new and old elements for size and shape. Install the new one in the same position. The sealing lip must seat evenly around the entire perimeter, with no misalignment or gaps.
Close the cover and check that it meets the housing along its entire edge. Secure the clips or screws. Tighten the screws only lightly so you don't strip the plastic: the torque is low, and a torque wrench isn't needed.
Reconnect the sensor connector and tighten the duct clamp, if you removed them.
Start the engine and listen for any unusual whistling sounds. Make sure no warning lights or errors appear on the instrument cluster, and check that the cover is seated tightly.

Common mistakes and warnings

Work on a cool engine, and don't run it with the cover removed or without a filter
Dust will get into the turbocharger and cylinders and cause rapid wear
If a misaligned cover or a torn sealing lip lets unfiltered air in, that will also damage the turbocharger
After replacement, check that no foreign objects (rags, fasteners) are left in the housing