AUDI 341.AU1I09 Air Pump Injection

( Model: S5-AUDI ), ( Part Type: Pump ), ( Conditions Options: Air Injection Pump ), ( Genuine Oem: Yes ), ( Ipn: 341.au1i09 )

Review AUDI Air Injection Pump fits S5 2009

The **Audi 341.AU1.I09 Air Injection Pump** is a critical component of the emissions control system found in the **2009 Audi S5 (3.0L V6 Biturbo)**, designed to significantly reduce harmful exhaust emissions by injecting air into the exhaust manifold before it reaches the catalytic converter. This precision-engineered part plays a pivotal role in the **Selective Catalytic Reduction (SCR) and Exhaust Gas Recirculation (EGR) systems**, ensuring optimal combustion efficiency while adhering to stringent environmental regulations. Manufactured to Audi s exact specifications, this **high-performance air injection pump** operates under high pressure, delivering a controlled stream of air into the exhaust stream to lower nitrogen oxide (NOx) emissions a key pollutant in internal combustion engines. Built with **durable materials**, including a robust impeller and a sealed motor assembly, it is engineered to withstand the demanding conditions of high-performance driving, including aggressive acceleration, high-speed cruising, and prolonged engine loads. The **AU1.I09 variant** is specifically tailored for the **3.0L V6 Biturbo engine** found in the S5, ensuring seamless compatibility with the vehicle s **common rail diesel injection system** and **turbocharged operation**. Whether installed in a daily driver or a performance-oriented vehicle, this air injection pump maintains peak efficiency, contributing to cleaner exhaust output while preserving the S5 s signature power and responsiveness. For owners seeking reliability and compliance with emissions standards, this **OEM-quality replacement** is an essential upgrade, ensuring long-term functionality and adherence to Audi s exacting engineering standards.

### **Pros and Cons of Buying a 2009 Audi S5 (3.4L AU1I09 with Air Injection Pump)**

#### **Pros**

1. **Performance and Driving Experience**

The 2009 Audi S5 is powered by a 3.4L V6 (AU1I09) engine, which produces around **333 horsepower and 295 lb-ft of torque**, delivering strong acceleration and a refined driving experience. The S5 features a **6-speed Tiptronic automatic transmission**, smooth power delivery, and a sport-tuned suspension that enhances handling.

2. **Luxury and Comfort**

Audi s interior is known for its high-quality materials, ergonomic design, and premium features. The S5 includes **leather upholstery, climate control, ambient lighting, and advanced infotainment (RNS 510 or similar)**. The cabin is well-insulated, reducing road noise, and the seats provide good support for long drives.

3. **Reliability of the AU1I09 Engine**

The 3.4L V6 (AU1I09) is a robust engine when maintained properly. It is less prone to major failures compared to some turbocharged engines of its time. With regular oil changes and attention to minor issues (like the air injection pump), it can last well beyond **150,000 200,000 miles**.

4. **Resale Value and Brand Prestige**

Audi retains a strong resale value, and the S5 remains a desirable luxury sports sedan. Owning an Audi carries prestige, and the model s performance-oriented reputation makes it attractive to potential buyers.

5. **Available Technology and Safety Features**

The 2009 S5 includes **standard features like ABS, ESP, airbags, and optional advanced safety tech** (depending on trim). The infotainment system, while dated by modern standards, is functional for navigation, media, and phone connectivity.

6. **Modification Potential**

The S5 is a popular platform for tuning, with aftermarket support for **exhaust upgrades, cold air intakes, and performance chips** to enhance power and responsiveness.

---

#### **Cons**

1. **Air Injection Pump (AIP) Issues**

The **air injection pump (AIP)** in the AU1I09 engine is a known weak point. It can fail, causing **check engine lights, rough idling, or even engine stalling**. Replacement costs around **$500 $800**, and the pump may fail again if the underlying issue (carbon buildup, oil dilution) isn t addressed.

2. **Maintenance Costs**

Audi vehicles, while luxurious, can be **expensive to maintain**. Parts, labor, and specialized diagnostics (e.g., for the MMI infotainment system) add up. Common issues include:

- **Timing chain stretch** (can lead to valve train noise if ignored).

- **Oil leaks** (valve cover gasket, oil filter housing gasket).

- **Electrical gremlins** (window regulators, sensors, infotainment glitches).

3. **Infotainment System Limitations**

The **RNS 510 or similar system** lacks modern connectivity (Apple CarPlay, Android Auto, wireless charging). Upgrading it requires third-party solutions, which can be costly and unreliable.

4. **Fuel Economy**

The S5 is **not fuel-efficient** for a luxury car, averaging **16 18 MPG combined**. Higher-end trims with larger tires and performance tuning further reduce efficiency.

5. **Rust and Bodywork Concerns**

Depending on the car s history, **rust in wheel wells, rocker panels, or undercarriage** can be an issue, especially in regions with harsh winters. A thorough inspection is essential.

6. **Depreciation and Market Demand**

While Audi retains value, the S5 is not as sought-after as newer models or more exotic Audi performance cars (e.g., S6, RS6). If you plan to sell later, you may not recover as much as with a newer vehicle.

7. **Potential Transmission Issues**

Some owners report **rough shifting or delayed engagement** in the Tiptronic transmission, though this is less common than in earlier models. A pre-purchase inspection should check for smooth operation.

---

### **Ending Conclusion**

The **2009 Audi S5 (AU1I09) is a capable and enjoyable luxury sports sedan**, offering a balance of performance, comfort, and Audi s signature refinement. However, **potential buyers must be prepared for maintenance costs, particularly around the air injection pump and general upkeep**. If well-maintained, it can be a **rewarding ownership experience**, but it is not a "set-and-forget" vehicle.

### **Recommendation**

- You prioritize **driving enjoyment, luxury, and brand prestige** over long-term cost savings.

- You are **willing to budget for maintenance** (oil changes, AIP replacement if needed, potential timing chain inspection).

- The car has a **clean service history** and has been **inspected for rust, leaks, and electrical issues**.

- You plan to **keep it for 5 7 years** and enjoy the ownership experience.

- You are **uncomfortable with higher maintenance costs** or lack access to Audi specialists.

- The **air injection pump has already failed** or the car lacks a full service record.

- You need **modern tech features** (CarPlay, Android Auto, wireless charging).

- You are looking for **better fuel efficiency** or a more practical vehicle.

**Final Verdict:** A **well-maintained 2009 S5 can be a fantastic car for the right owner**, but it requires **proactive care** to avoid costly surprises. Always **get a pre-purchase inspection** and verify the air injection pump s condition before buying.

Details:

Ryan Ferrell. All Engines and Transmission must be shipped to a commercial address. Toggle navigation Menu. Buzz Gardner.

Menu Air Injection Pump 2009 Audi S5. Notes AIR INJECTION PUMP, 08-10, 079959231.: model S5 AUDI. Just the option.

specifications emissyste:

• for makes: Audi
• for years: 2009
• model: S5-audi
• part type: Pump
• conditions options: Air Injection Pump
• genuine oem: Yes
• ipn: 341.au1i09

payments emissyste:

• other
• credit card: Discover
• wallet: Apple-pay

returns emissyste:

• policy: Returns Accepted
• time: 30 Days
• paid by: Seller

general emissyste:

• condition: Used
• Car Truck Parts Accessories > Exhaust Emission Systems > Secondary Air Smog Pumps

seller emissyste:

• city: Pompano Beach, Florida
• # reviews: 10872
• rating: 99.8%

offer emissyste:

• started: February 6, 2026
• availability: In Stock
• options: Ship-to-home
• sold: 0
• quantity: 1

shipping emissyste:

• type: Fixed
• carrier: UPS
• class: Standard
• service: UPS Ground
• transit: 4-11 Days
• cost: $0.00

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