How to Replace the Engine Air Filter on BMW 335d E90

How to replace the engine air filter on a BMW 335D E90 body style. A similar procedure may also be used on other BMW models with the same engine. This is the M57 3L inline 6 cylinder. A dirty or plugged air filter can cause a variety of issues consisting of poor fuel economy, poor performance, throttle hesitation, and even throwing an engine code. #turnermotorsport #foxwell #bmwe90

Engine air filter: https://click.linksynergy.com/deeplink?id=N/DVI*Mr8tI&mid=43304&murl=https%3A%2F%2Fwww.turnermotorsport.com%2Fp-582285-air-filter%2F
Foxwell scanner: https://www.foxwelldiag.com/products/foxwell-nt530?variant=40625470537894&ref=5

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Tools/Supplies Needed:
-standard screwdriver
-brush
-vacuum
-bottle of water
-new engine air filter

Procedure:
Here I’m using my Foxwell NT530 OBD scanner. A BMW specific scanner is recommended to pull the proper codes. Generic OBD2 codes can send you on a chase trying to sort out those issues. If you do you have a check engine light and if that code is 4D76 for the charging air temperature sensor, this can potentially be a plugged air filter. A friend of mine told me about this issue, it’s quite common amongst diesel BMWs.

First is opening the hood, the air filter is located on the left side when facing the front of the car. There are three latches on the airbox, one on each side and one at the rear. The top cover locks into the bottom cover behind the headlight.

This can be pulled up to replace the filter, however it is a good idea to clean your airbox before installing a new filter. Using a standard screwdriver, loosen the intake hose gear clamp. This will allow us to remove the top cover of the airbox, and place it off to the side.

There is no need to disconnect the sensor wire.

As you can see there is quite a bit of debris on the old air filter and in the airbox. Using a vacuum cleaner, remove as much of the debris as possible. The assistance of a brush can be used to help agitate the surface, loosening up any debris.

After that was using another brush with a bottle of water. Soap can also be used if you wish. There are drain holes in the bottom of the airbox, therefore there’s no issue with pooling water. It’s always important to make sure those drain holes are not plugged either. Starting with a clean air box before the new filter is installed will prolong the life of your air filter.

Compare the old and new air filters to ensure they are the same. As you can see the older filter is quite dirty then compared to the new replacement.

With the airbox dry, a new air filter can be installed. Push the new air filter into place, ensuring it is properly seated around the perimeter.

Install the air box cover and clip it back onto the intake hose. Make sure the filter doesn’t push off when locking the cover into place.

Then lock the latches into place.

Finally is finishing up with tightening the gear clamp.

If you do have an engine code, the code may disappear over time with driving. However you can also clear the codes using the Foxwell NT530 Scanner. I do have a video that goes more into depth on using the scanner. That’s a brief overview, you would plug the scanner in and turn the ignition to the on position Without the engine running.

Select the pre-loaded BMW diagnostic feature, then scan the codes. Once the scanner is done you can select the option to clear the codes.

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