Audi S6 Engine Variable Valve Timing (VVT) Solenoid Guide (2013-2018)
Keep your S6's 4.0T V8 running strong by understanding VVT solenoid failure and replacement.
- VVT solenoid failure is often caused by dirty engine oil; ensure your S6 has had the 21H7 oil strainer recall performed.
- Your 4.0T V8 has multiple solenoids; use a diagnostic tool to identify the specific failing unit before buying parts.
- Symptoms include a rough idle, poor acceleration, and a Check Engine Light with codes like P0018 or P0021.
- Always replace the small rubber O-ring seal with the solenoid to prevent future oil leaks.
Is Your Audi S6 VVT Solenoid Failing?
A bad VVT solenoid can make your powerful S6 feel sluggish and run poorly. Because the 4.0T V8 engine relies on precise timing for its performance, any issue with the VVT system will be noticeable. The most common cause of failure is contaminated or old engine oil clogging the small passages and screens inside the solenoid. Keeping up with regular, high-quality oil changes is the best way to protect them.
Common Failure Symptoms
- Check Engine Light: This is often the first sign. You may see codes like P0018, P0019, or P0021. 🎬 Watch this diagnostic guide for troubleshooting the P0018 code.
- Rough Idle: The engine may shake or sound unstable when you're stopped.
- Poor Acceleration: The car may feel hesitant or slow to respond when you press the gas pedal.
- Reduced Fuel Economy: You might notice you're visiting the gas station more often.
- Engine Stalling: In some cases, the engine may stall at low speeds or when coming to a stop.
- Unusual Engine Noise: You might hear a ticking or metallic sound from the engine area.
A Critical Note on the 4.0T Engine
The 2013-2018 Audi 4.0T engine is known for a serious issue where a small oil strainer in the engine valley gets clogged. This can starve the turbochargers of oil, leading to major failure. Audi issued a recall (NHTSA 22V178000 / Audi code 21H7) to fix this. Since VVT solenoids also rely on clean oil, this underlying engine issue can cause them to fail. Ensure this recall work has been done on your vehicle.
🎬 See how to replace the critical oil screen and PCV.Choosing the Right Aftermarket VVT Solenoid
When replacing a VVT solenoid, you don't have to buy from the dealer. Aftermarket parts can offer the same quality for less money. Your S6's 4.0T V8 has multiple VVT solenoids, so be sure to identify which one needs replacement. Here’s a look at the available brands.
Brand Quality Tiers
- Standard Ignition (SMP): A well-known aftermarket brand. Some of their premium lines, like 'Blue Streak', are marketed as higher quality and may be manufactured in Europe.
- Gates: Gates is a major name in engine timing components like belts and tensioners. Their solenoids are designed to meet original specifications, though some forum users note they are often manufactured in China.
- Walker Products: Walker is a long-standing company that focuses on engine management parts. They state their parts are engineered and tested to meet or exceed OE standards for fit and function.
- Global Parts: This brand often serves as a value-oriented option in the aftermarket, providing a cost-effective solution for repairs.
Pro Tip: Always replace the solenoid's rubber O-ring seal at the same time. These seals harden over time from engine heat and can cause oil leaks. A new seal ensures a leak-free installation.
VVT Solenoid Replacement Cost for 2013-2018 Audi S6
The cost to replace a VVT solenoid depends on whether you do it yourself or use a repair shop. Your S6 has more than one solenoid, and this table estimates the cost for replacing a single unit.
| Part/Service | Estimated Cost |
|---|---|
| New OEM Solenoid | $130 - $180 |
| New Aftermarket Solenoid | $84 - $203 |
| Shop Labor | $150 - $300 |
| Total Professional Replacement | $280 - $483 |
Frequently Asked Questions
How difficult is it to replace an S6 VVT solenoid?
For someone with mechanical experience, it's a manageable job. It involves removing an electrical connector and one or two bolts. However, access on the packed 4.0T V8 engine can be tight, which makes the job more challenging than on a simpler engine. If you are not comfortable working in tight spaces, it's best to leave it to a professional.
🎬 Watch: Step-by-step walkthrough for replacing the cam adjuster solenoid.How many VVT solenoids does the Audi S6 4.0T have?
V-type engines like the V8 in your S6 have separate camshafts for each cylinder bank. This means they typically have at least two, and often four, VVT solenoids (one for the intake and exhaust cam on each bank). It's important to use a diagnostic scanner to confirm which solenoid is faulty before ordering a replacement.
Is an OEM VVT solenoid better than aftermarket?
OEM parts are a guaranteed fit and quality, but you pay a premium. Reputable aftermarket brands like Gates, Walker Products, or Standard Ignition build their parts to meet or exceed original specifications and can be a reliable, cost-effective alternative. For a part like this, a high-quality aftermarket solenoid is often a smart choice.
Can I just clean my VVT solenoid?
Some owners have had temporary success by removing and cleaning the solenoid's screens. However, if the solenoid's internal electronics are failing or if it's heavily clogged, cleaning is not a long-term solution. Given the reasonable cost of a new aftermarket part and the labor to access it, replacement is usually the most reliable repair.
Helpful Videos
Technical Specifications
OEM Part Numbers: 06H115243M 06H115243J 06H115243E 06E109257T
Electromagnetically-activated oil control valve. The 4.0T V8 engine uses multiple units for intake and exhaust camshafts on both cylinder banks.
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 S6: