The dreaded “check engine” light illuminates your Audi A3’s dashboard, and your OBD-II scanner reveals the cryptic code 00668. What does it mean, and more importantly, what should you do? This comprehensive guide delves into the intricacies of Audi A3 fault code 00668, providing owners, repair shops, and technicians with the knowledge and strategies to diagnose and resolve this issue.

Understanding Audi A3 Fault Code 00668

Fault code 00668 in an Audi A3 typically points to a problem with the fuel tank ventilation system. More specifically, it often indicates a malfunctioning EVAP purge valve, also known as the N80 valve. This valve regulates the flow of fuel vapors from the fuel tank to the engine for combustion. A faulty N80 valve can disrupt this process, leading to various drivability issues and potentially failing emissions tests. Ignoring this code can lead to further complications and more expensive repairs down the road. So, let’s dive into the potential causes and solutions.

Common Causes of Fault Code 00668

Several factors can trigger the 00668 fault code in your Audi A3. These include:

• Faulty N80 Purge Valve: The most common culprit is a malfunctioning N80 valve itself. This can be due to electrical issues within the valve, a blockage preventing it from opening or closing correctly, or simply wear and tear over time.
• Wiring Harness Problems: Damaged or corroded wiring in the harness connected to the N80 valve can disrupt the electrical signals controlling its operation, leading to the 00668 code.
• Vacuum Leaks: Leaks in the vacuum lines connected to the EVAP system can affect the pressure regulation and trigger the fault code.
• Blocked Charcoal Canister: The charcoal canister, part of the EVAP system, absorbs fuel vapors. If it becomes clogged, it can disrupt the system’s functionality and cause the 00668 code.

Location of the N80 Purge Valve on an Audi A3 Engine.

Troubleshooting and Fixing Code 00668 Audi A3

How can you tackle this code default 00668 audi a3? Here’s a step-by-step guide to troubleshooting and fixing the issue:

1. Scan for Codes: Use an OBD-II scanner to confirm the presence of the 00668 code.
2. Inspect the N80 Valve: Visually check the N80 valve for any signs of damage or corrosion.
3. Check Wiring and Connections: Inspect the wiring harness and connectors for any loose connections, breaks, or corrosion.
4. Test the N80 Valve: Use a multimeter or a diagnostic tool to test the electrical functionality of the N80 valve.
5. Check for Vacuum Leaks: Inspect the vacuum lines connected to the EVAP system for any leaks.
6. Inspect the Charcoal Canister: Check the charcoal canister for blockage.
7. Replace Faulty Components: Replace any faulty components, such as the N80 valve, wiring harness, or charcoal canister.
8. Clear the Code: After repairs, clear the code using the OBD-II scanner and verify that it does not reappear.

Testing the N80 Purge Valve with a Multimeter.

“A systematic approach is crucial when dealing with code 00668,” says John Miller, Senior Automotive Technician at Miller’s European Auto Repair. “Start with the most common causes and work your way through the diagnostic process. This will save you time and money in the long run.”

Preventing Future Occurrences of Code 00668

Regular maintenance is key to preventing the recurrence of the 00668 code. This includes:

• Regular Inspections: Regularly inspect the EVAP system components, including the N80 valve, wiring, and charcoal canister.
• Fuel System Cleaning: Periodically clean the fuel system to prevent buildup that can affect the EVAP system.

“Preventive maintenance is the best medicine,” advises Maria Sanchez, Lead Diagnostic Technician at Sanchez Auto Solutions. “Regularly inspecting and cleaning your fuel system can prevent many issues, including the dreaded 00668 code.”

Conclusion

Addressing the Audi A3 fault code 00668 requires a thorough understanding of the EVAP system and a systematic diagnostic approach. This guide provides valuable insights into the causes, troubleshooting steps, and preventive measures to tackle this issue effectively. Remember, early diagnosis and repair can save you from more extensive and costly repairs down the line. For further assistance or specialized diagnostics, connect with us at VCDSTool. Our office is located at 6719 W 70th Ave, Arvada, CO 80003, USA, and you can reach us by phone at +1 (641) 206-8880 and our email address: vcdstool@gmail.com.

Cleared Fault Code on an OBD-II Scanner.

FAQ

1. What is the code default 00668 audi a3? It indicates a problem within the fuel tank ventilation system, often the N80 purge valve.
2. Can I drive my car with this code? Yes, but it’s advisable to address the issue promptly to prevent further complications.
3. How much does it cost to fix code 00668? The cost varies depending on the specific cause and necessary repairs.
4. Is code 00668 serious? While not immediately critical, ignoring it can lead to further damage and more expensive repairs.
5. Can I fix code 00668 myself? If you have some mechanical aptitude, you might be able to. However, professional diagnosis is recommended.
6. What tools do I need to diagnose code 00668? An OBD-II scanner and a multimeter are essential.
7. How can I prevent code 00668 from returning? Regular maintenance and fuel system cleaning are key preventive measures.