A Guide to the Engine VVT Solenoid for the 2012-2018 Audi S8
Understanding common failures and choosing the right replacement for your S8's 4.0T engine.
- The 2012-2018 Audi S8 has four VVT solenoids; diagnose which one is faulty before replacing.
- A Check Engine Light with codes like P0011 or P0018 is a primary indicator of a VVT system issue.
- Inspect the old solenoid for a broken filter screen, a known issue on the 4.0T engine.
- Using the correct specification of engine oil and performing regular changes is crucial for VVT system health.
Symptoms of a Failing VVT Solenoid
A failing VVT solenoid can mimic other serious engine problems. The most common sign is a lit Check Engine Light on your dashboard. You may also experience a noticeable loss of power, rough or unstable idling, poor fuel economy, and a rattling sound from the engine bay. The car's computer may put the engine into a reduced power "limp mode" to prevent damage.
Diagnose Before You Replace
The symptoms of a bad VVT solenoid can also be caused by more severe issues like a stretched timing chain, failing tensioners, or low engine oil pressure. Given the high cost of timing system repairs on the 4.0T engine, it's wise to confirm the solenoid is the true culprit. A common diagnostic step is to swap the suspect solenoid with a known good one from a different position and see if the trouble code follows the part.
🎬 Watch: How to fix VVT codes and replace the solenoid.Choosing the Right Aftermarket VVT Solenoid
When replacing a VVT solenoid on a high-performance engine like the Audi S8's, part quality is important. While an OEM part is always an option, quality aftermarket brands offer a reliable alternative at a lower cost.
- Premium Aftermarket (e.g., Standard Ignition): Brands like Standard (Standard Motor Products) are often considered top-tier in the aftermarket world. They have a reputation for durable construction and often supply parts directly to automakers. For a complex vehicle like the S8, a premium aftermarket part provides a good balance of quality and value.
- Reputable Mid-Range (e.g., Gates): Gates is a well-known brand, famous for its timing belts and hoses, and it also produces reliable engine management components. These parts are a solid choice for a dependable repair.
- Economy Brands (e.g., Walker Products, Global Parts): These brands provide a more budget-friendly option. While they can get your vehicle back on the road, they may not have the same longevity or stringent quality control as premium brands. For a high-strung engine like the 4.0T, the small cost savings may not be worth the potential risk.
A Note on the S8 4.0T Engine
The Audi 4.0T is a sophisticated, high-output engine. Using high-quality engine oil that meets Audi's specific requirements and maintaining regular oil changes is the single best way to prolong the life of your VVT system components.
Known Issues for the 2012-2018 Audi S8
While there are no specific NHTSA recalls for the VVT solenoids on this vehicle, Audi has issued Technical Service Bulletins (TSBs) related to camshaft adjustment. One Audi Technical Update notes that the filter screen on the VVT solenoid can break off, potentially sending debris into oil passages. When replacing a solenoid, it is critical to inspect the old part to ensure the entire screen is intact. If it is not, further steps may be needed to retrieve the missing pieces.
Cost of Replacing an Engine VVT Solenoid
This table presents estimated costs. Prices can vary based on your location and chosen repair shop.
| Item | Estimated Cost |
|---|---|
| New Aftermarket VVT Solenoid | $83.72 - $202.52 (per solenoid) |
| New OEM VVT Solenoid | $250 - $400 (per solenoid) |
| Shop Labor | $100 - $250 |
| Total Aftermarket Replacement | $184 - $453 |
| Total OEM Replacement | $350 - $650 |
Frequently Asked Questions
How many VVT solenoids does the 2012-2018 Audi S8 have?
The Audi S8 with the 4.0T V8 engine has four VVT solenoids (camshaft adjustment valves). There is one for the intake camshaft and one for the exhaust camshaft on each of the two cylinder banks.
Can I just clean a VVT solenoid?
Sometimes, cleaning the solenoid's screens and passages can temporarily restore function if it is clogged with sludge. However, the failure is often electrical or internal. Given the relatively low cost of a new aftermarket part compared to the labor involved, replacement is usually the most reliable solution.
Is an oil change necessary when replacing a VVT solenoid?
While not strictly required, it is highly recommended. A common cause of solenoid failure is contaminated or old engine oil. Replacing the oil and filter ensures the new solenoid operates in a clean environment, extending its lifespan.
Is this a DIY-friendly repair?
For someone with moderate mechanical skill, yes. The solenoids are held by a single bolt and are located on the front of the cylinder heads. However, access can be tight, and on the S8, some solenoids may be located under wiring harnesses or other components that need to be moved, increasing the complexity.
🎬 Watch: Tips for removing a stuck or stubborn VVT solenoid.Helpful Videos
Technical Specifications
OEM Part Numbers: 06E109257L 06E109257F 06E109257J
The 4.0T engine uses four VVT solenoids (camshaft adjustment valves), one for intake and one for exhaust on each cylinder bank. Part numbers can vary for intake vs. exhaust and may have been superseded. Always verify the correct part number for your specific vehicle's VIN before ordering.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Audi S8: