Audi A4 B9 45 Tfsi Mild Hybrid
Welcome to our dedicated range of drivetrain components for your Audi A4 B9 45 Tfsi Mild Hybrid. As a Swedish driveline specialist, we understand the demands placed on a modern premium...
Products for Audi A4 B9 45 Tfsi Mild Hybrid
- Position: Front
- Splines wheel side: 42
- Total length: 465 mm
- Joint diameter: 101 mm
- Joint diameter, gearbox side: 123 mm
- Position: Front
- Splines wheel side: 42
- Total length: 464 mm
- Position: Front
- Total length: 108 mm
- Inner diameter: 22 mm
- Outer diameter: 80 mm
- Height: 85 mm
- Position: Inner
- Inner splines: 34
- Total length: 88 mm
- Joint diameter: 123 mm
- Outer splines: 34
Audi A4 B9 45 Tfsi Mild Hybrid drivetrain parts
The Audi A4 B9 45 Tfsi Mild Hybrid represents a sophisticated balance between performance and efficiency. The drivetrain in this model is engineered to handle the output of the turbocharged engine combined with the electric assistance from the mild-hybrid system. This places high demands on every individual component in the power transmission, from the gearbox out to the wheels. When maintaining or repairing your Audi A4 B9, it is crucial to choose parts that match the original specifications to preserve the car's dynamic driving characteristics and safety.
As a drivetrain specialist, we offer a carefully selected range for this exact engine variant. Because the 45 TFSI engine delivers substantial torque, drive shafts and CV joints are subjected to severe stresses during both acceleration and engine braking. Investing in the correct spare parts is not just a question of function, but also of long-term economy and driving pleasure. We help you navigate the technical specifications so your Audi remains the precision machine it was built to be.
How the drivetrain is engineered on the Audi A4 B9 45 Tfsi Mild Hybrid
The drivetrain of an Audi A4 B9 45 Tfsi Mild Hybrid is a technical masterpiece where the internal combustion engine works in tandem with a belt-driven starter generator. This integration means the drivetrain frequently experiences rapid transitions between load and energy recuperation. Power is transferred via an advanced gearbox to the front drive shafts, or to all four wheels via the Quattro system where fitted. Each drive shaft for the Audi A4 B9 45 Tfsi Mild Hybrid is precision-balanced to eliminate vibrations and ensure quiet running, preserving Audi's characteristic premium feel.
The inner and outer constant velocity joints play a pivotal role in accommodating wheel travel during suspension movement and steering while maintaining uninterrupted power delivery. On a mild hybrid, these components are dimensioned to endure the specific load patterns produced when the electric motor assists during pull-away. The materials chosen for the joints and the quality of the grease used inside the CV boots are critical factors in withstanding heat build-up and the mechanical forces experienced under varied European road conditions.
Common faults and symptoms
Despite Audi's high build quality, the drivetrain is an exposed area of the car that suffers wear over time. One of the most common signs that an outer CV joint on an Audi A4 B9 45 Tfsi Mild Hybrid is failing is a rhythmic clicking noise heard when turning sharply at low speeds. This is often caused by a split CV boot, which allows dirt to enter and grease to escape, resulting in rapid wear to the internal bearing surfaces. If not addressed promptly, it can lead to total failure where the car loses drive completely.
Vibrations under acceleration are another common symptom, which can frequently be traced back to an inner CV joint on the Audi A4 B9 45 Tfsi Mild Hybrid. Unlike an outer joint, faults in the inner joint typically present as a shudder through the car's body rather than the steering wheel. It is also important to watch for oil leaks around the driveshaft flanges at the gearbox. Early detection of these symptoms can save considerable expense, as it is often possible to replace just a single joint or boot kit rather than a complete drive shaft.
Common parts to replace on the Audi A4 B9 45 Tfsi Mild Hybrid
When it is time for servicing or repairing the drivetrain on your Audi A4 B9, certain components feature more frequently in our order system. To make finding the right part straightforward, we have categorised the most relevant components for your model. By selecting the appropriate category below, you can be confident of receiving parts technically tailored to the 45 TFSI Mild Hybrid platform.
- Drive shafts for Audi A4 B9 45 Tfsi Mild Hybrid – complete shafts for a fast, straightforward replacement.
- Outer CV joints for Audi A4 B9 45 Tfsi Mild Hybrid – to eliminate clicking noises during cornering.
- Inner CV joints for Audi A4 B9 45 Tfsi Mild Hybrid – to cure shudder and vibrations under load.
In addition to these core components, replacing CV boot kits is another routine job. An intact boot provides the ultimate protection for your CV joints. We always recommend inspecting the condition of the boots at every service, especially on a car like the Audi A4 B9 where the drivetrain operates with such tight tolerances that the slightest contamination can impair the driving experience.
How to find the right part for the Audi A4 B9 45 Tfsi Mild Hybrid
Proceed to the relevant category for your Audi A4 B9 45 Tfsi Mild Hybrid:
On a car with several potential drivetrain issues, it pays to start in the correct category right away. Comparing the specific subcategories for the Audi A4 B9 45 Tfsi Mild Hybrid makes it easier to distinguish between drive shaft, CV joint or prop shaft problems and proceed to the page that best matches your symptoms and fitment needs.
- Drive shafts for Audi A4 B9 45 Tfsi Mild Hybrid
- Outer CV joints for Audi A4 B9 45 Tfsi Mild Hybrid
- Inner CV joints for Audi A4 B9 45 Tfsi Mild Hybrid
Identifying the correct spare part for a modern Audi can be challenging due to numerous technical variations across production runs. For the Audi A4 B9 45 Tfsi Mild Hybrid, specifications vary depending on chassis number, gearbox type, and whether the car is front-wheel drive or Quattro. To ensure you receive a part that fits perfectly, select your car's exact make, model and engine variant in our catalogue. This filters out everything except the components matched to your car's factory configuration.
Once you have selected your model and engine, you will only see car parts relevant to your specific variant. We have invested significant effort into mapping our database against Audi's technical data to eliminate ordering errors. If you are still uncertain which component you need, our customer support team is ready to share their expertise. Our goal is for you to order with complete confidence, knowing that your part will fit without modification and save valuable time for you or your garage.
Why buy from CVJoint24?
CVJoint24 is not just another car-parts retailer; we are a dedicated specialist focusing purely on driveline systems. For owners of the Audi A4 B9 45 Tfsi Mild Hybrid, this means access to technical expertise that general parts stores rarely match. We understand the engineering subtleties of your car's drivetrain and only stock components built to a standard we would happily install on our own vehicles. With our fitment guarantee, you can be sure of getting the correct part first time.
We combine this deep technical knowledge with streamlined dispatch across the EU from our Swedish central warehouse in Helsingborg. We know that a car stuck off the road costs money and causes frustration, which is why we prioritise prompt delivery without compromising on accuracy. By choosing a specialist, you also benefit from expert assistance and hassle-free returns if required. Choose CVJoint24 for a smooth buying experience and a drivetrain that delivers dependable performance kilometre after kilometre.
Frequently asked questions about Audi A4 B9 45 Tfsi Mild Hybrid
How do I know if my Audi A4 B9 needs a new drive shaft?
The most common symptoms are vibrations through the car under acceleration or unusual noises from the wheel arches. If you notice shaking under load that subsides when you lift off the accelerator, it is often a worn inner CV joint or the drive shaft itself.
What is the difference between the inner and outer CV joint on a 45 TFSI?
The outer CV joint sits closest to the wheel and accommodates steering movement; when worn, it typically produces clicking noises when cornering. The inner CV joint is positioned next to the gearbox and accommodates axial movement; failure here usually causes vibrations through the body shell.
Do these parts fit both saloon and Avant models?
Yes, drivetrain components for the Audi A4 B9 45 Tfsi Mild Hybrid are generally identical for both saloon and Avant models, provided they share the same drivetrain layout (such as front-wheel drive or Quattro). Always confirm by selecting your vehicle's exact make, model and engine.
How does your fitment guarantee work for Audi parts?
Our fitment guarantee means that if you have selected your car by make, model and engine and we state that the part fits, we guarantee correct fitment. In the unlikely event that it does not fit, we will help you find the correct part or issue a full refund.
Why is the mild hybrid system relevant when choosing a drive shaft?
The mild hybrid setup in the 45 TFSI provides additional instant torque during pull-away and hard acceleration, which increases peak shock loads on the drive shafts compared to conventional engine variants. This demands high-quality components engineered to withstand these torque spikes.
Can I replace just the CV boot if the joint is still in good condition?
Yes, if you catch a split CV boot early before dirt and moisture have damaged the joint, thoroughly cleaning, regreasing, and fitting a new CV joint boot is usually sufficient. It is a highly cost-effective way to preserve and extend the lifespan of the CV joint.