Air Filter Change in ’09 and later TDIs (CBEA/CJAA, CJAA)

Take a few minutes and you’re good for another 20K!

VW TDIs are turbocharged engines with precise air metering. This means that the intake air has to be clean to protect the turbo and Mass Airflow Sensor. It also helps to keep moisture out of the air system where possible. And the airbox on a TDI should seal well to protect both against dirt and innacurate Mass Airflow readings.

Even though most folks agree that the manufacturer’s recommended 10,000 mile oil change interval is the way to go, there’s lots of debate regarding how often to replace the air and fuel filters in TDIs, especially CBEAs. Some people change air filters as often as every 10,000 miles, but most feel every 20,000 miles is a good interval. Whatever change interval you choose, the filter change is quick and easy. Here’s how to do it.

What will you need?

Air filter, part number 1K0 129 620 or 620A. The difference between these two filters is the number ending in the letter A includes a pre-filter. CBEA engines have a two part airbox that can draw air from inside the engine compartment if the snorkel to the outside is blocked. The prefilter helps keep moisture out of the engine when the airbox is accessing air from the engine compartment.

Many people decide to save a few dollars and forgo the prefilter. Whether or not you use one is up to you. However, we believe that all CBEA TDIs in North America were delivered with pre-filters. It’s your choice.

All you’ll need is a Phillips head screwdriver for this swap. Easy.

Changing the filter

There are a total of six screws on the top of the air filter box, four on the filter and two on the MAF connector. Remove the four airbox screws

Then remove the two screws on the MAF connector.

You can see all six screws in this top down view

Once the screws are out, lift the cover and remove the filter. Here you can see the old (20K) and new filters side-by-side.

If you look at the dirty filter you can see the line made by the partition in the airbox.

Put the new filter in place. It should fit snugly. Press the cover into place and replace the screws. You’re done!

A final note

Folks sometimes like to open their airbox to take a look at their filter to see if it’s time for replacement. This isn’t a good idea. Manufacturers maintain that the gasket on the filter is designed to seal—once. Technically, if you open the box you should replace the filter as it won’t seal as well the second time.

9 thoughts on “Air Filter Change in ’09 and later TDIs (CBEA/CJAA, CJAA)”

  1. I am driving a 2003 polo tdi, suddenly while i was on a stop sign the idling changed and the whole body is shaking and even the engingine is not shakin normally. can you please identify the cause and how can i solve this problem.

    1. Hi Raymond,

      I have the same question as of yours. I have a 2007 Q7 3.0 TDI and tried opening mine to check the filter health and now it is not getting closed. Were you able to find some help? Any web url or other info you can share would be great help. Would aprecaite.
      Thanks
      Talha

  2. There were 8 screws in my 09 TDi, four around the air filter and an additional 4 around the MAF. Removing only 6 will not let you pry open the air box enough to swap the filter.

  3. I’ve searched for an air filter for my 2009 Jetta TDi using the information provided here. I’ve called every parts store local to me, all of them carry the paper filter without the prefilter. My local VW dealer carries part #1K0 129 620 E (as in Echo); they’re saying that this is the paper filter with the prefilter. I don’t want to drive all the way in to the dealership and discover that low and behold even the dealership technicians don’t understand (though that wouldn’t surprise me!). Is the 620E the same as the 620A you mention in this posting?
    Thanks.

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