Description
Product Overview
The C 35 154/1 Engine Air Filter is a direct-fit replacement for a wide range of Audi and Volkswagen vehicles equipped with the 1.8L and 2.0L TSI/TFSI turbocharged engines. These engines power some of the most popular European cars on the road — from the fun-to-drive Audi TT to the practical VW Jetta and iconic Beetle. Turbocharged TSI engines are particularly sensitive to airflow quality, and this filter provides the precise balance of filtration and flow the factory engineers specified.
Key Features
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Broad Audi/VW Coverage: Direct fit for Audi A3 (2008–2013), TT (2009–2015), and VW Jetta (2014–2018), Golf (2015–2017), Beetle (2014–2017), and more with 1.8L/2.0L TSI engines
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Full Cross-Reference: Replaces C 35 154/1, 1K0129620E (VW OEM), and CA9711
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TSI Turbo-Ready: Engineered for the higher airflow demands of turbocharged direct-injection engines — maintains proper MAF readings and boost response
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Precision Compression Seal: The polyurethane frame compresses against the air box lid to create a positive seal — no gasket needed, no unfiltered air bypass
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Easy DIY Replacement: Tool-free installation in under 5 minutes — accessible from the top of the engine bay on most applications
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OEM-Spec Media: Matches the filtration efficiency and airflow specifications of the factory VW/Audi filter
Vehicle Compatibility
| Make |
Model |
Engine |
Years |
| Audi |
A3 (8P) |
2.0L TFSI Turbo I4 |
2008–2013 |
| Audi |
TT (8J) |
2.0L TFSI Turbo I4 |
2009–2015 |
| Volkswagen |
Jetta / GLI |
1.8L / 2.0L TSI Turbo I4 |
2014–2018 |
| Volkswagen |
Golf / GTI |
2.0L TSI Turbo I4 |
2015–2017 |
| Volkswagen |
Beetle |
1.8L / 2.0L TSI Turbo I4 |
2014–2017 |
Specifications
| Specification |
Value |
| Part Number |
C 35 154/1 |
| Cross References |
1K0129620E (VW OEM), CA9711 |
| Filter Type |
Panel Air Filter |
| Media Type |
Pleated Cellulose/Synthetic Blend |
| Frame Material |
Flexible Polyurethane Compression Seal |
| Service Interval |
30,000 miles or every 3rd oil change |
Installation Instructions
- Open the hood — the air filter housing is typically on the passenger side (varies by model — driver side on some)
- Locate the rectangular black plastic air box with the intake tube leading to the turbocharger
- Release the spring clips or screws securing the lid — usually 5-8 fasteners
- Lift the lid carefully — note the position of the MAF sensor wiring if it's mounted on the lid
- Remove the old filter — check for any oil residue in the housing (a small amount is normal for TSI engines; excessive oil may indicate PCV issues)
- Wipe the housing clean with a dry cloth
- Install the new C 35 154/1 filter — seal side down, centered in the lower housing
- Replace the lid — ensure all clips are fully engaged and the MAF sensor connector is secure
- Start the engine — no warning lights should appear; if they do, double-check MAF sensor connector
Frequently Asked Questions
Q: Does this fit my 2015 VW Jetta 1.8T?
A: Yes, the C 35 154/1 is the correct filter for the 2014–2018 Jetta with the 1.8L TSI Gen 3 engine. Direct drop-in replacement.
Q: What's the difference between this and the C 25 114/1?
A: The C 35 154/1 is for Audi/VW vehicles (A3, TT, Jetta, Golf, Beetle), while the C 25 114/1 is for BMW applications. They have different dimensions and are not interchangeable between brands.
Q: How do I know if my air filter needs replacing?
A: Hold the filter up to a light source. If light doesn't pass through the media, the filter is restricted. Also check for visible dirt accumulation, oil saturation, or pleat deformation. On TSI engines, reduced fuel economy and sluggish boost response are common signs of a dirty filter.
Q: Will an aftermarket filter cause a check engine light?
A: No. This filter matches OEM specifications for airflow and filtration. It will not trigger diagnostic codes. If you get a CEL after installation, check that the MAF sensor connector is properly seated and that the air box lid is fully closed and sealed.
Q: Can I use this with a cold air intake?
A: No. This is a factory-replacement panel filter designed for the stock air box. If you've installed an aftermarket cold air intake system, you'll need the filter that matches that specific intake's dimensions — usually a conical/cone filter, not a panel.
Q: How does a clean air filter affect turbo life on the 2.0T?
A: The 2.0T TSI's turbocharger spins at up to 200,000 RPM. Any dust passing through a compromised filter acts like sandblasting on the compressor wheel, eroding the blades and reducing efficiency over time. Combined with the TSI's known oil consumption tendencies, a clean air filter is critical for turbo longevity.
Related Products
Blog Resources
For VW/Audi maintenance tips, TSI engine guides, and European car DIY repairs, visit our European Car Maintenance Blog.
