Audi A6 trouble code 00979 can be a real headache. This code indicates an issue with the intake air temperature sensor (G42), a critical component for engine performance and fuel efficiency. If your Audi A6 is displaying this code, you’ve come to the right place to learn everything you need to know about diagnosing, troubleshooting, and fixing it.

Understanding Audi A6 Trouble Code 00979

This trouble code specifically refers to an implausible signal from the G42 sensor. This means the engine control unit (ECU) is receiving a reading that doesn’t make sense based on other operating parameters. This could mean a faulty sensor, wiring issues, or even a problem with the ECU itself. Ignoring this code can lead to reduced fuel economy, poor engine performance, and even potential damage to your engine.

Common Causes of Trouble Code 00979

Several issues can trigger the 00979 trouble code in your Audi A6. These include:

• Faulty Intake Air Temperature Sensor: The most common culprit. Over time, the sensor can wear out or become contaminated, leading to inaccurate readings.
• Wiring Problems: Damaged, corroded, or loose wiring between the sensor and the ECU can disrupt the signal.
• ECU Issues: While less common, a malfunctioning ECU can also misinterpret or misreport sensor data.
• Vacuum Leaks: Unmetered air entering the engine can affect the intake air temperature and trigger the code.
• Dirty Air Filter: A severely clogged air filter can restrict airflow and impact sensor readings.

Diagnosing Trouble Code 00979

Diagnosing this trouble code requires a systematic approach. Here’s a step-by-step guide:

1. Retrieve the Code: Use an OBD-II scanner to confirm the presence of the 00979 code.
2. Visually Inspect the Sensor and Wiring: Look for any obvious damage, corrosion, or loose connections.
3. Check the Air Filter: Inspect the air filter for excessive dirt or blockage.
4. Test the Sensor: Use a multimeter to test the sensor’s resistance and voltage output.
5. Check for Vacuum Leaks: Inspect vacuum hoses and connections for leaks.

Fixing Trouble Code 00979

Once you’ve identified the cause, fixing the problem is usually straightforward:

1. Replace the Sensor: If the sensor is faulty, replace it with a new OEM or high-quality aftermarket part.
2. Repair or Replace Wiring: Fix any damaged or corroded wiring. Ensure all connections are secure.
3. Address ECU Issues: If the ECU is faulty, it may require reprogramming or replacement. This is best left to a qualified technician.
4. Fix Vacuum Leaks: Replace any damaged vacuum hoses or tighten loose connections.
5. Replace the Air Filter: If the air filter is dirty, replace it with a new one.

How can a bad intake air temperature sensor affect my Audi A6?

A malfunctioning intake air temperature sensor can lead to several problems, including reduced fuel efficiency, decreased engine performance, and difficulty starting in cold weather.

What is the typical cost to replace an intake air temperature sensor on an Audi A6?

The cost to replace an intake air temperature sensor typically ranges from $50 to $150, depending on the part and labor costs.

“A proper diagnosis is key. Don’t just throw parts at the problem. Take your time, and follow the diagnostic steps,” advises Michael Schmidt, a seasoned Audi technician with over 20 years of experience.

Conclusion

Addressing Audi A6 trouble code 00979 is crucial for maintaining optimal engine performance and fuel efficiency. By understanding the potential causes and following the diagnostic steps outlined above, you can effectively resolve this issue and keep your Audi A6 running smoothly. For further assistance or if you’re not comfortable performing these tasks yourself, don’t hesitate to contact us at vcdstool at +1 (641) 206-8880 and our email address: vcdstool@gmail.com or visit our office at 6719 W 70th Ave, Arvada, CO 80003, USA.

FAQ

1. What does Audi A6 trouble code 00979 mean? It indicates an implausible signal from the intake air temperature sensor (G42).
2. Can I drive my Audi A6 with this code? While you can still drive, it’s best to address the issue promptly to avoid further problems.
3. How do I clear the code after fixing the problem? Use an OBD-II scanner to clear the code after completing the repairs.
4. Is this a common problem with Audi A6s? It’s a relatively common issue related to sensor wear and tear.
5. Can extreme temperatures affect the sensor? Yes, extreme hot or cold can impact the sensor’s performance and lifespan.
6. What tools do I need to diagnose and fix this code? You’ll need an OBD-II scanner, a multimeter, and basic hand tools.
7. Where can I find a reliable replacement intake air temperature sensor? OEM parts or reputable aftermarket brands are recommended.

“Regular maintenance is the best way to prevent these types of issues. Keeping your air filter clean and checking for any signs of wear and tear can save you headaches down the road,” adds David Miller, another experienced automotive specialist at vcdstool.