AUDI 079-131-102-A Secondary Air Pump Injection Check Valve
fits make: Audi. year: 2008–2011.
( Manufacturer Part Number: 079-131-102-A ), ( Part Type: Valve Pump Check ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Universal Fitment: Direct Replacement ), ( Year: 2008 2009 2010 2011 ), ( Parts Included: Only Part Reference 12 On The Diagram Is Included ), ( Placement On Vehicle: Right )
Review AUDI Genuine Secondary Air Injection Pump Check Valve fits 2008–2011
The **Audi 079-131-102-A Secondary Air Injection Pump Check Valve** is a precision-engineered component designed to maintain optimal performance within a vehicle s secondary air injection system, a critical element of modern diesel and some gasoline engines. This check valve plays a pivotal role in the **Exhaust Gas Recirculation (EGR) and Diesel Particulate Filter (DPF) regeneration processes**, ensuring that air is introduced into the exhaust stream only under controlled conditions to enhance combustion efficiency and reduce harmful emissions. Crafted from high-grade materials, including durable rubber seals and a robust metal housing, the valve is built to withstand the extreme temperatures and pressures encountered in high-performance automotive exhaust systems, typically ranging between **1,000 C to 1,200 C (1,832 F to 2,192 F)** during active regeneration cycles. Its one-way design allows air to flow into the exhaust manifold while preventing backflow, which could dilute the exhaust gases prematurely and compromise the effectiveness of the engine s emissions control strategies. This valve is particularly essential in **Audi models equipped with TDI (Turbocharged Direct Injection) diesel engines**, where the secondary air injection system is integral to meeting stringent environmental regulations such as **Euro 5 or Euro 6 emissions standards**. Over time, wear and tear, exposure to soot, or contamination from exhaust byproducts can lead to failure, resulting in symptoms like **increased fuel consumption, rough idle, or illuminated check engine lights** due to improper air-fuel ratios or DPF clogging. Replacing the faulty check valve with the **OEM Audi 079-131-102-A** ensures a seamless fit and reliable operation, restoring the system s functionality and extending the lifespan of the engine s emissions-related components. Whether for routine maintenance or repair, this valve exemplifies Audi s commitment to precision engineering, delivering both performance and compliance with modern automotive emissions technology.
**Pros and Cons of buying a Audi 079-131-102-A Secondary Air Injection Pump Check Valve**
The **Audi 079-131-102-A Secondary Air Injection Pump Check Valve** is a critical component for vehicles equipped with an air injection system, particularly those with **EGR (Exhaust Gas Recirculation) or emissions-related issues**. Below is a detailed breakdown of its advantages and drawbacks, followed by a conclusion and recommendation.
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### **Pros of Purchasing This Part**
1. **Compatibility and Fit**
- This part is designed specifically for Audi models, ensuring a precise fit without modifications. It is commonly used in **Audi A4 (B5/B6/B7), A6, TT, and other models with air injection systems**, particularly those with **1.8T, 2.0T, or 3.0T engines** from the late 1990s to early 2010s.
- OEM (Original Equipment Manufacturer) quality reduces the risk of installation issues or misalignment.
2. **Performance and Emissions Compliance**
- The secondary air injection system helps **reduce harmful emissions** by injecting air into the exhaust manifold to promote combustion of unburned fuel, lowering CO and hydrocarbons.
- A faulty check valve can lead to **increased emissions**, triggering a **check engine light (CEL)** and potential **failing emissions tests**. Replacing it restores proper system function.
- Improves **engine efficiency** by ensuring the air injection system operates correctly, which can also help with **cold starts** and **idling stability**.
3. **Prevents Further Damage**
- A failing check valve can cause **excessive backpressure** in the air injection system, potentially damaging the **air pump, hoses, or sensors**. Replacing it early prevents secondary issues.
- Some models may **develop carbon buildup** in the intake or exhaust if the system isn t functioning, leading to **reduced power and fuel efficiency**.
4. **Cost-Effective Repair**
- Replacing the check valve is a **relatively inexpensive fix** compared to other emissions-related repairs (e.g., replacing the entire air injection pump or EGR system).
- Labor costs are typically low since it involves **removing a few hoses and bolts** a job that can often be done at home with basic tools.
5. **Easy Availability**
- This part is widely available from **OEM suppliers, aftermarket brands, and online marketplaces** (e.g., RockAuto, Amazon, eBay, or Audi specialty stores).
- Many **remanufactured or high-quality aftermarket alternatives** exist, offering cost savings without sacrificing performance.
6. **Diagnostic Clarity**
- If your vehicle has a **secondary air injection system code (e.g., P0400, P0401, P0402, P0403, P0404)**, this part is often the culprit. Replacing it can **clear the code** and resolve the issue, making diagnostics straightforward.
7. **Long-Term Reliability**
- Unlike some plastic or low-quality aftermarket parts, the **OEM check valve is durable** and designed to last the lifespan of the vehicle if installed correctly.
- Aftermarket options from reputable brands (e.g., **Fel-Pro, Dorman, or Bosch**) also offer good longevity.
---
### **Cons of Purchasing This Part**
1. **Potential Counterfeit or Low-Quality Parts**
- The aftermarket for Audi parts is **prone to counterfeit or substandard replicas**, especially on eBay or Amazon.
- **Symptoms of a bad part**:- **Plastic instead of metal** (OEM is typically metal).
- **Loose or improperly seated** when installed.
- **Fails prematurely**, leading to repeated replacements.
- **Solution**: Purchase from **trusted suppliers** (e.g., RockAuto, local Audi dealers, or verified eBay sellers) and check reviews.
2. **Misdiagnosis Risk**
- Some symptoms (e.g., **check engine light, rough idle, or poor acceleration**) can be caused by **other issues** such as:- **Faulty air injection pump**
- **Clogged EGR valve**
- **Vacuum leaks**
- **Exhaust leaks**
- **Faulty oxygen sensors**
- **Solution**: Always **scan for codes** and **inspect related components** before replacing the check valve.
3. **Installation Complexity (For Some Models)**
- While the replacement is **not extremely difficult**, some **Audi models (especially older ones)** may require:- **Removing the exhaust manifold** (on some 1.8T engines).
- **Disconnecting electrical connectors** for the air pump.
- **Careful routing of hoses** to avoid damage.
- **Solution**: If unsure, consult a **mechanic or watch a detailed YouTube guide** for your specific model.
4. **OEM vs. Aftermarket Trade-Off**
- **OEM parts** are more expensive but **guaranteed to fit and function** as intended.
- **Aftermarket parts** (even high-quality ones) may have **slight variations in material or design**, though they are usually reliable.
- **Solution**: If budget is tight, opt for a **well-reviewed aftermarket brand** (e.g., **Fel-Pro, Dorman, or Bosch**), but avoid **cheap no-name parts**.
5. **Recurring Issues in Older Vehicles**
- Some **older Audi models (pre-2000s)** may have **wear-and-tear issues** in the air injection system, leading to:- **Leaking hoses**
- **Corroded connectors**
- **Failed pumps**
- **Solution**: Inspect the **entire air injection system** (hoses, pump, connectors) during replacement to prevent future problems.
6. **Limited Lifespan in High-Mileage Vehicles**
- If the vehicle has **high mileage (150,000 miles)**, the **air injection pump itself may be failing**, and replacing just the check valve may not fully resolve the issue.
- **Solution**: Test the **air pump s functionality** (listen for proper operation, check for continuity) before assuming the check valve is the only problem.
7. **Environmental and Regulatory Concerns**
- Some regions have **strict emissions regulations**, and failing to maintain the air injection system can lead to:- **Failing emissions tests**
- **Potential fines** in some areas
- **Solution**: Ensure the repair is done **promptly** to avoid compliance issues.
---
### **Conclusion**
The **Audi 079-131-102-A Secondary Air Injection Pump Check Valve** is a **practical and cost-effective solution** for vehicles experiencing **emissions-related issues, check engine lights, or poor engine performance** due to a failing air injection system. Its **OEM compatibility, role in emissions reduction, and preventative benefits** make it a **wise investment** for most owners.
However, **potential pitfalls** such as **counterfeit parts, misdiagnosis, or installation challenges** require **due diligence**. Buyers should:- **Verify the part s authenticity** before purchasing.
- **Confirm the correct diagnosis** (check engine codes, visual inspection).
- **Consider professional installation** if unsure about the process.
- **Inspect related components** to avoid recurring problems.
For **most DIYers and mechanics**, this part is a **straightforward and necessary repair** that restores proper vehicle function while maintaining emissions compliance.
---
### **Final Recommendation**
1. **If you have confirmed codes (P0400, P0401, P0402, P0403, P0404) and suspect the check valve:**- **Purchase from a trusted supplier** (e.g., RockAuto, Audi dealer, or a well-reviewed aftermarket brand like Fel-Pro or Dorman).
- **Compare prices** OEM is ideal, but high-quality aftermarket is often sufficient.
- **Follow a step-by-step guide** for your specific model to ensure proper installation.
2. **If you re unsure about the diagnosis:**- **Run a full emissions scan** to confirm the issue is with the check valve.
- **Inspect the air injection pump and hoses** sometimes the pump fails first, and replacing just the valve won t help.
3. **For high-mileage or problematic vehicles:**- **Consider replacing the entire air injection system** (pump check valve hoses) for long-term reliability.
- **Check for related issues** (EGR valve, oxygen sensors, exhaust leaks) that may contribute to the problem.
4. **For budget-conscious buyers:**- **Aftermarket parts from reputable brands** (e.g., Bosch, Mann-Filter) offer a **good balance of cost and quality**.
- **Avoid ultra-cheap parts** they often fail quickly and may not fit properly.
**Overall, this part is a smart purchase for fixing emissions issues and preventing further engine damage, provided the correct diagnosis and installation are performed.**
Details:
Parts must be resalable and in the original packaging. Electrical parts are not returnable. 4.2L, engine area. Losses or damages that occur after final delivery confirmation are not covered.
To 05/31/ 2010. Special Order Items are not returnable under any circumstance. Genuine Audi Parts. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer.
part #: 079131102 prices
- $39.00-$359.04
specifications emissyste:
- for makes: Audi
- for years: 2008-2011
- mpn: 079-131-102-a
- part type: Valve Pump Check
- genuine oem: Yes
- manufacturer warranty: 1 Year
- universal fitment: Direct Replacement
- year: 2008 2009 2010 2011
- parts included: Only Part Reference 12 On The Diagram Is Included
- placement on vehicle: Right
payments emissyste:
- other
- credit card: Discover
- wallet: Google-pay
shipping emissyste:
- service: Standard
- cost: $8.99
- class: Standard
- transit: 5-10 Days
- type: Fixed
offer emissyste:
- options: Ship-to-home
- quantity: 1
- availability: In Stock
- sold: 0
- started: May 24, 2026
seller emissyste:
- # reviews: 7604
- rating: 99.8%
- city: Henderson, Nevada
returns emissyste:
- paid by: Seller
- time: 30 Days
- policy: Returns Accepted
general emissyste:
- Car Truck Parts Accessories > Exhaust Emission Systems > Other Exhaust Emission Parts
- condition: New
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