2019 Audi A6 Quattro Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2019 Audi A6 Quattro and How to Resolve Them

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
21% chance it's the
Spark Plugs
0%
15% chance it's the
Ignition Coil
0%
64% chance it's
Something else
The most common reasons a 2019 Audi A6 Quattro has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
  • Spark Plugs: Worn or fouled spark plugs can lead to misfires, poor fuel economy, and difficulty starting the engine.
  • Ignition Coil: A faulty ignition coil can cause misfires, rough idling, and difficulty starting the engine due to inadequate spark delivery to the spark plugs.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2019 Audi A6 Quattro has rough idle?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Brake caliper failure occurs in two different ways, and they create different symptoms.

The caliper can become stuck, in which case it won't release the brake pads. The seized caliper will cause the vehicle to brake constantly on one side, forcing the car to move toward that side. This pulling will be accompanied by a strong odor from one wheel.

Another way calipers fail is by leaking. If the caliper leaks, the brake pedal will feel too easy to push, and will sink all the way to the floor when held. Braking will become less effective the longer this goes on. There may also be brake fluid leaking onto the wheel.

Here are a few common symptoms of worn-out brake pads:

  1. Low brake pad warning light is on: Not all vehicles are equipped with this system, but if yours is, this dashboard indicator light will likely be the first signal it’s time to replace your brake pads.
  2. Brakes start to squeal regularly: This is often one of the first signs of worn brake pads and is caused by a metallic piece built into brake pads for this exact purpose. This part contacts the brake rotor to make a squealing or whining noise when the pads are low.
  3. Brakes make loud grinding noise: If not addressed early enough, your brake pads may get so worn that the metal backing plate of the pad grinds against the metal rotor.
  4. Brake pads look thin: You may be able to visually check your brake pad thickness to determine if they need replacement.

Brake rotors are mainly maintenance free, but when they have been subjected to abnormally hard use, the heat they absorb can cause the metal to turn blue, and cracking to occur. When this occurs, customers often specify they have lost braking power, or the vehicle's brakes are making noise. There may be no symptoms at all related to changing the brake rotors, since it is recommended to change brake rotors on most modern vehicles when performing a standard brake service.

Most often, a brake system inspection will just be a routine portion of manufacturer specified maintenance, and will be performed at mileage intervals. In those cases, there will likely be no symptoms. However, when a brake system makes a funny noise, causes vibration, is hard to use, will not slow the vehicle, prevents the vehicle from driving, makes the vehicle pull to one side, or leaks brake fluid, the vehicle will need a visit dedicated to the inspection of the brake system.

What are the initial diagnostic steps to take for a rough idle in a 2019 Audi A6 Quattro?

When faced with a rough idle in your 2019 Audi A6 Quattro, the first step is to utilize a diagnostic scanner to check for any fault codes stored in the vehicle's computer system. This can quickly highlight specific issues that may be affecting engine performance. Next, inspect the air intake system for any leaks or clogs, as these can disrupt airflow and lead to an unstable idle. A clean and properly installed air filter is essential for optimal engine function. Following this, evaluate the fuel system by checking components like the fuel filter and injectors to ensure they are delivering fuel efficiently. Additionally, inspect the spark plugs for wear and proper gap distance, as faulty spark plugs can significantly contribute to rough idling. It’s also important to test the ignition system, including ignition coils and wires, to rule out misfires caused by malfunctioning components. Finally, check the engine sensors, such as the mass airflow and oxygen sensors, to ensure they are operating correctly, as faulty sensors can lead to drivability issues. By systematically addressing these areas, you can effectively diagnose and resolve the rough idle in your Audi A6 Quattro.

What are the common problems that could cause a rough idle in a 2019 Audi A6 Quattro?

When diagnosing a rough idle in a 2019 Audi A6 Quattro, it's essential to consider several common problems that could be affecting the vehicle's performance. One of the primary culprits is a dirty or faulty mass airflow sensor, which can disrupt the air-fuel mixture necessary for smooth engine operation. Additionally, vacuum leaks in the intake system can introduce unmetered air, leading to an uneven idle. Worn-out spark plugs or faulty ignition coils may also cause misfires, contributing to the roughness. A clogged fuel filter can restrict fuel flow, further impacting idle quality. Other potential issues include problems with the EGR valve, which can affect emissions and engine performance, and a malfunctioning throttle body that disrupts air intake. Lastly, a dirty or faulty oxygen sensor can alter the air-fuel mixture, exacerbating idle issues. By systematically checking these components, DIY enthusiasts can effectively identify and resolve the underlying causes of a rough idle in their Audi A6 Quattro.

How urgent is it to address the rough idle in my 2019 Audi A6 Quattro?

Addressing a rough idle in your 2019 Audi A6 Quattro is not just a matter of comfort; it is crucial for the vehicle's overall health and performance. A rough idle can indicate serious underlying issues, such as problems with the fuel or ignition systems, or even faulty sensors. If left unattended, these issues can escalate, leading to more severe engine damage and significantly higher repair costs. Moreover, a rough idle can compromise the drivability of your vehicle, making it uncomfortable and potentially unsafe for you and your passengers. Regular maintenance and prompt attention to symptoms like a rough idle are essential in preventing more serious problems from developing. Therefore, it is vital to address this issue as soon as possible to ensure your Audi A6 Quattro continues to operate smoothly and efficiently.

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