2009 Audi A4 engine air filter: Sizes & Replacement Parts
1.8L I4 turbo: WIX 49043; 2.0L I4 turbo: WIX 42972 / Bosch 5508WS; 3.2L V6 naturally aspirated: WIX 42972 / Purolator A45457. Pick the engine tab that matches your car before ordering.
Looking for the cabin / A/C air filter instead? 2009 Audi A4 cabin air filter →
Choose your engine size
The 2009 Audi A4 uses different engine air filter part numbers by engine. Select your engine, then use the part numbers in that panel.
Not sure which engine you have?
Check the sticker on the driver's door jamb (open the door and look at the door frame) — it lists the engine displacement. You can also look at the rear of the car: a V6 badge means the larger engine; no engine badge typically indicates the base 4-cylinder (I4). When in doubt, check your owner's manual or the underhood emissions sticker.
1.8L I4 turbo
Main catalog answer: WIX 49043
- Filter type
- Basic
- Sources
- WIX Filters
The Direct Fit part is the primary catalog listing for this engine row. No additional part numbers were found for this engine row.
Links search this exact part number. Confirm 2009 Audi A4 and the 1.8L I4 turbo engine in the seller's vehicle selector before checkout.
2.0L I4 turbo
Main catalog answer: WIX 42972 / Bosch 5508WS
- Filter type
- Basic
- Sources
- WIX Filters, Bosch Auto Parts
The Direct Fit part is the primary catalog listing for this engine row. WIX 49043 is also listed by checked catalogs for this same engine row.
Links search this exact part number. Confirm 2009 Audi A4 and the 2.0L I4 turbo engine in the seller's vehicle selector before checkout.
3.2L V6 naturally aspirated
Main catalog answer: WIX 42972 / Purolator A45457
- Filter type
- Basic
- Sources
- WIX Filters, Purolator Now
The Direct Fit part is the primary catalog listing for this engine row. WIX 49143, Purolator TA45457 are also listed by checked catalogs for this same engine row.
Links search this exact part number. Confirm 2009 Audi A4 and the 3.2L V6 naturally aspirated engine in the seller's vehicle selector before checkout.
Fitment scope and limits
The 2009 Audi A4 can use different engine air filters by engine size. Use the row for 1.8L I4 turbo, 2.0L I4 turbo, 3.2L V6 naturally aspirated, then confirm that same engine in the seller's vehicle selector.
The checked catalogs did not provide source-backed replacement interval for this exact record, so this page does not publish those fields.
Catalogs can list more than one part number for the same vehicle. Use this page to compare the listed numbers, then use the seller's vehicle selector before ordering.
Source notes
Listed in 3 catalogs. These part numbers come from filter manufacturer catalogs. Use the source trail below to see which catalog supported this page.
| Source | Role | Supports | Checked |
|---|---|---|---|
| Bosch Auto Parts | Primary | Filter for 2.0L I4 turbo | 2026-06-25 |
| Purolator Now | Corroboration | Filter for 3.2L V6 naturally aspirated | 2026-06-25 |
| WIX Filters | Corroboration | Filters for 3 engine options | 2026-06-25 |
Checked catalogs: Bosch Auto Parts, Purolator Now, WIX Filters. Replacement interval is not listed unless a source provides it for this exact vehicle and engine row.
2009 Audi A4 maintenance checklist
One part checked. Look up the rest while you're here.
- Cabin air filter 2009 Audi A4 cabin filter part numbers
- Engine air filter Match engine row Checked
- Oil type & capacity 2009 Audi A4 oil viscosity & fill amount
Questions this page answers
What engine air filter fits the 2009 Audi A4 1.8L I4 turbo?
Checked catalogs list WIX 49043 for the 2009 Audi A4 1.8L I4 turbo. The primary listing is WIX 49043. Confirm this part number in the seller's vehicle selector before ordering.
What engine air filter fits the 2009 Audi A4 2.0L I4 turbo?
Checked catalogs list WIX 42972, WIX 49043, Bosch 5508WS for the 2009 Audi A4 2.0L I4 turbo. The primary listing is WIX 42972 / Bosch 5508WS, with WIX 49043 also listed. Confirm this part number in the seller's vehicle selector before ordering.
What engine air filter fits the 2009 Audi A4 3.2L V6 naturally aspirated?
Checked catalogs list WIX 42972, WIX 49143, Purolator A45457, Purolator TA45457 for the 2009 Audi A4 3.2L V6 naturally aspirated. The primary listing is WIX 42972 / Purolator A45457, with WIX 49143, Purolator TA45457 also listed. Confirm this part number in the seller's vehicle selector before ordering.
How do I know which engine my 2009 Audi A4 has?
Check the sticker on the driver's door jamb — it lists the engine displacement. A "V6" badge on the rear of the car means the larger engine. No engine badge typically means the base 4-cylinder (I4). When in doubt, check your owner's manual or the underhood emissions sticker.
Is the 2009 Audi A4 engine air filter the same across all engine options?
The 2009 Audi A4 can use different engine air filters by engine size. Use the row for 1.8L I4 turbo, 2.0L I4 turbo, 3.2L V6 naturally aspirated, then confirm that same engine in the seller's vehicle selector.
Does this page confirm a replacement interval?
The checked catalogs did not provide source-backed replacement interval for this exact record, so this page does not publish those fields.
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