Audi S4 (2004-2010) Engine Camshaft Position Sensor Replacement Guide
Experiencing stalling or a check engine light in your B6 or B7 S4? It might be a failing camshaft position sensor.
- A Check Engine Light with codes P0341 or P0346 is a strong indicator of a camshaft sensor issue.
- This is a DIY-friendly repair, but access to the sensors at the back of the V8 engine can be tight.
- Choose reputable aftermarket brands like Delphi, Hella, or Vemo for reliability; avoid the cheapest options.
- A faulty sensor can cause dangerous stalling; do not ignore the symptoms.
Is Your S4 Running Rough? It Could Be a Camshaft Position Sensor
If your 2004-2010 Audi S4 is having trouble starting, idling poorly, or feels sluggish, a faulty engine camshaft position sensor could be the culprit. This small but vital sensor provides key data to your engine's computer. When it fails, it can cause a range of frustrating and potentially dangerous issues. This guide will help you understand the symptoms, choose the right aftermarket replacement, and know what to expect from the repair.
Symptoms of a Failing Camshaft Position Sensor
A bad camshaft sensor can mimic other engine problems, but there are several common signs to watch for. The most obvious is the Check Engine Light. You may also experience:
- Difficulty Starting: The engine cranks but struggles to start, or fails to start at all.
- Stalling: The engine may shut off unexpectedly while idling or driving.
- Rough Idle and Misfires: The engine runs unevenly, shakes, or you feel a sputtering sensation.
- Poor Acceleration: The car feels weak and lacks its usual power.
- Reduced Fuel Economy: You may notice you're visiting the gas station more often.
Code Correlation is Key
A diagnostic trouble code (DTC) is the most reliable way to confirm a sensor issue. Common codes for camshaft position sensor failure on the Audi S4 include P0341 (Bank 1) and P0346 (Bank 2). 🎬 See a detailed breakdown of these common Audi fault codes. These codes point to a problem with the sensor's signal, but can sometimes be caused by more serious issues like a failing timing chain adjuster, a known problem on the 4.2L V8. If you have these codes, especially with engine rattle, it's wise to have a professional diagnose the root cause.
🎬 Learn how timing chain issues can mimic sensor failure symptoms.Choosing the Right Aftermarket Sensor for Your S4
When it comes to sensors for German vehicles, quality varies. You don't need to buy from the dealer, but choosing a reputable aftermarket brand is important for long-term reliability. Cheaper, no-name sensors can fail quickly or provide inaccurate readings, bringing you right back to square one.
Here’s a breakdown of common aftermarket brand tiers:
- OEM-Supplier Quality (Recommended): Brands like Delphi, Hella, and Vemo often manufacture parts for Audi or to the same specifications. They offer a balance of dealer-level quality without the high price tag. Many owners and shops trust these brands for critical electronic components.
- Reputable Aftermarket: Brands like Standard Ignition (SMP), Walker Products, and NGK have a long history of producing reliable engine management parts. They are generally a safe bet and offer good performance and durability for the price.
- Budget-Focused (Use with Caution): Brands like URO Parts and others in the lower price range can be a gamble. While some users report success, others experience premature failure. For a critical sensor like this on a high-performance engine, it's often worth spending a little more for a trusted brand. Some brands like Beck Arnley may re-box parts from other manufacturers, so quality can be inconsistent.
Pro Tip: Replace the O-Ring
The camshaft position sensor is sealed with a small rubber O-ring. Always replace this O-ring when you install a new sensor to prevent oil leaks. A light coat of silicone paste on the new O-ring can make installation easier and ensure a good seal.
Cost to Replace an Audi S4 Camshaft Position Sensor
| Part / Service | Estimated Cost |
|---|---|
| New Aftermarket Sensor | $23 - $73 |
| Shop Labor | $100 - $200 |
| Total Estimated Cost (DIY) | $23 - $73 |
| Total Estimated Cost (Shop) | $123 - $273 |
Note: Your S4 has four camshaft position sensors. Costs are per sensor. Prices are estimates and can vary based on your location and the specific brand chosen.
Frequently Asked Questions
Where are the camshaft position sensors located on a 2004-2010 Audi S4?
The 4.2L V8 engine has four sensors. They are located at the back of the engine on the valve covers. Bank 1 is the passenger side and Bank 2 is the driver side in the US. Access can be tight, especially for the lower sensors.
Can I replace the camshaft position sensor myself?
Yes, this is a feasible DIY job for someone with basic tools and mechanical skill. The sensors are typically held in by a single T30 Torx bolt. The main challenge is accessing them, which may require removing the engine cover and coolant reservoir to create space. The difficulty is low, and it should take less than an hour per sensor.
🎬 Watch this step-by-step guide to replacing the right-side sensor.Should I replace all four sensors at once?
It's not strictly necessary. The diagnostic trouble code (e.g., P0341 for Bank 1 or P0346 for Bank 2) will usually point to a specific sensor or bank. However, since they are all the same age and exposed to the same conditions, if one fails, the others may not be far behind. If you're paying for labor, it might be cost-effective to replace them in pairs (both on Bank 1 or Bank 2) or all four at once.
Are there any recalls for the Audi S4 camshaft position sensor?
No, there are no specific recalls from the NHTSA for the camshaft position sensors on the 2004-2010 Audi S4. However, there are Technical Service Bulletins (TSBs) related to camshaft adjuster issues that can trigger camshaft position sensor fault codes.
Helpful Videos
![How to Fix AUDI P0346 Engine Code in 3 Minutes [2 DIY Methods / Only $9.76]](https://img.youtube.com/vi/3nqyXUj-ADQ/mqdefault.jpg)
Technical Specifications
OEM Part Numbers: 07L905163C 07L905163B 07L905163A 07L905163
The 2004-2010 Audi S4 4.2L V8 uses four Hall-effect type camshaft position sensors, one for each of the four camshafts (two intake, two exhaust). They are located on the rear of the cylinder heads.
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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 S4:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your S4 Running Rough? It Could Be a Camshaft Position Sensor
- Symptoms of a Failing Camshaft Position Sensor
- Code Correlation is Key
- Choosing the Right Aftermarket Sensor for Your S4
- Pro Tip: Replace the O-Ring
- Cost to Replace an Audi S4 Camshaft Position Sensor
- Frequently Asked Questions
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