Audi B9 Rocker Arm Failure: Reasons & Easy Solutions!

Common Audi A9 rocker arm problems can arise due to design issues. These problems often manifest as ticking noises, misfires, or rough idling. To address these issues, owners can consider replacing the rocker arms with revised versions. 

Additionally, regular maintenance, including using high-quality engine oil and following recommended service intervals, can help prevent or mitigate rocker arm problems in the Audi A9.

The Audi B9 is a vehicle that ticks all the boxes perfectly. However, it had some issues with its rocker arm by design. Also, regular wear and tear can damage a rocker arm in many ways that we often don’t acknowledge. 
This article will provide you with the details that you should know to solve the rocker arm failure problems of the Audi B9. Let’s begin!

How to Detect Audi B9 Rocker Arm Failure?

While issues with the rocker’s arm can be complex, they have easy symptoms which make them easy to detect. Some of the common symptoms include- 

Ticking or Tapping Noise:

One of the most noticeable signs is a repetitive ticking or tapping noise coming from the engine. This noise is often heard as the rocker arms lose their proper function, and the valve train components fail to operate smoothly.

Misfires:

Rocker arm failure can lead to inconsistent valve operation, resulting in misfires in one or more cylinders. You may notice the idling is irregular or uneven, drop engine performance, and poor fuel efficiency.

Loss of Power:

As misfires occur, the engine may experience a loss of power, especially during acceleration. 

When pressing the throttle, you may see that it lacks responsiveness. So, while this is a temporary issue, this could be the reason behind your rocker arm not working.

The loss of power could also be due to the battery not charging due to malfunctioned alternator. So, keep that in check as well!

Check Engine Light (CEL):

When rocker arm issues cause misfires or other problems that affect engine performance, the vehicle’s onboard computer may trigger the check engine light (CEL). Scanning the engine control module (ECM) for trouble codes can help identify the specific issue.

Poor Fuel Economy:

Rocker arm problems can cause inefficient combustion. As a result, it can lead to reduced fuel economy. If you see decreased miles per gallon (MPG), it may be a symptom of rocker arm failure.

However, there are many other reasons behind poor fuel economy that are not unique to your vehicle. For that reason, check for other symptoms before confirming the issue for your vehicle.

Engine Overheating:

In some cases, rocker arm failure can cause overheating, as improper valve timing can affect the engine’s ability to cool itself efficiently.

Also, issues with the parking brake malfunctioning could potentially affect the engine for the worst. So keep that in mind as well! 

Increased Exhaust Emissions:

Due to poor combustion caused by rocker arm problems, there may be an increase in harmful exhaust emissions. This can lead to a failed emissions test if applicable in your region.

Visible Damage:

If rocker arms have severely failed or broken, you may find visible damage to the valve train components upon inspection. This can include bent or damaged pushrods, damaged rocker arms, or even damage to the camshaft or valves.

Causes behind Audi B9 Rocker Arm Failure

While Audi B9 Rocker arm damage is easy to detect. However, people generally don’t know the causes behind such issues. The common causes behind the Audi B9 failure are- 

Rocker Arm Design:

The original rocker arm design (part number 06M109417H) used in some early B9 S4 engines appears to have inherent weaknesses, leading to premature failures.

However, Audi hasn’t called back the old models or provided any replacement by default. For this reason, you need to visit your dealership and get it changed if your rocker’s arm is of the old method.

High RPM Operation:

Some users reported that the rocker arm issues became noticeable when the engine exceeded 6.5k to 7k RPM. High RPM operation may exacerbate the problem.

High RPM (Revolutions Per Minute) operation in an automobile engine refers to running the engine at elevated speeds, often near or at the manufacturer’s specified redline limit. 

High RPMs result in increased power and torque output, making it advantageous for scenarios like overtaking on highways or spirited driving

If the RPM is too high, it requires immediate action on your part.

Audi B9 Rocker Arm Failure: Solutions

Here are a few solutions for dealing with a failing Audi B9 Rocker Arm-

Upgraded Rocker Arms:

Audi has introduced revised rocker arms (part number 0P2109417) with improved design features. Consider replacing the rocker arms with the newer version if your vehicle has the older, problematic ones.

Regular Maintenance:

Maintain a strict maintenance schedule, including regular oil changes and adhering to Audi’s recommended service intervals. Proper lubrication and maintenance can help reduce wear and tear on engine components.

Monitoring Engine Performance:

Pay attention to any weird noise, such as ticking or knocking, and promptly investigate them. Early detection of issues can prevent further damage and potentially save on repair costs.

Consider Warranty Coverage:

If your vehicle is still under warranty, report any issues to your Audi dealership for evaluation and potential warranty coverage. Some users in the forum reported having their engines replaced under warranty due to rocker arm failures.

Independent Mechanic Assessment:

If your vehicle is out of warranty or you prefer to work with an independent mechanic, consider having them assess the condition of your rocker arms and related components. 

They can provide recommendations and cost estimates for any necessary repairs or upgrades.

Understand Build Dates:

Pay attention to your vehicle’s build date to determine if it falls within the range of potentially affected models. 

As discussed in the forum threads, later build dates (after 06/2018) may have received improved parts, reducing the likelihood of rocker arm issues.

Proactive Replacement:

If you have an early build B9 S4 and want to be proactive, consider replacing the rocker arms and related components with the newer, revised versions even if you haven’t experienced issues yet. This may help prevent future problems.

Frequently Asked Questions (FAQs):

What Happens When a Rocker Arm Goes Bad?

A faulty rocker arm prevents the valves from closing. Thus causing decreased power and poor acceleration. So, you should check it as soon as possible.

What Causes a Rocker Arm to Break?

The main cause of rocker arm failure is faulty manufacturing. So, in case of failures, you need to consult your manufacturer immediately. 

How Important is a Rocker Arm in a Car?

Transmitting the camshaft’s movement to the engine’s intake and exhaust valves is the primary function of a rocker’s arm. This occurs through direct contact of these parts and ensuring movement of the shaft.

Conclusion

The rocker’s arm is a crucial part of the vehicle. However, rocker arm failures are generally caused due to manufacturer issues and other problems. So, you need to be aware of the issues to prevent any problems.
In this article, we’ve discussed all you need to know about rocker problems in the Audi B9. We hope you found this article helpful!