An Audi S5 Owner's Guide to the Manifold Absolute Pressure (MAP) Sensor (2008-2018)
Experiencing rough idles or power loss in your S5? Your MAP sensor could be sending a misleading signal.
- A MAP sensor code (P0106) on an S5 is often caused by a vacuum leak, not the sensor itself. Always check for cracked hoses first.
- Bosch is the OEM supplier; choosing a Bosch aftermarket sensor provides dealer quality without the dealer price tag.
- The 2008-2018 S5 used three different engines (V8, Supercharged V6, Turbo V6). You must get the correct part number for your specific engine.
- After replacement, you must clear the Check Engine Light with a scan tool for the system to function correctly.
Understanding Your S5's MAP Sensor
A failing Manifold Absolute Pressure (MAP) sensor can cause a surprising number of driveability issues with your 2008 to 2018 Audi S5. Because this sensor directly influences the air-fuel mixture, a bad signal can make your high-performance engine feel sluggish and inefficient. It's a common failure point, but often the sensor itself is not the root cause. A MAP sensor-related trouble code frequently points to other issues, like a simple vacuum leak.
Is it a MAP or a Boost Sensor?
On forced-induction engines like the supercharged 3.0T and turbocharged B9 S5, you will often find multiple pressure sensors. They might be called MAP sensors, boost sensors, or charge air pressure sensors. While they perform similar functions, their location determines their primary role. For this guide, we are focusing on the sensor(s) that measure pressure inside the intake manifold, which are critical for engine load calculation.
A Note on Engine Generations
The 2008-2018 S5 was built with three different engines. It is critical to identify your specific engine to get the right part.
- B8 (2008-2012 Coupe): 4.2L V8 (naturally aspirated)
- B8/B8.5 (2010-2017): 3.0L TFSI V6 (supercharged)
- B9 (2018): 3.0L TFSI V6 (turbocharged)
Always verify the part number with your vehicle's VIN before ordering.
Symptoms of a Failing MAP Sensor
When a MAP sensor provides incorrect readings, the ECU makes poor decisions about fuel and timing. This can show up in several ways:
- Check Engine Light: This is the most common sign. You will likely see code P0106. 🎬 Watch: Understanding the causes and fixes for the P0106 code.
- Rough Idle: The engine may vibrate or struggle to maintain a steady RPM at a stop.
- Poor Performance: You'll notice sluggish acceleration, hesitation, or a general lack of power.
- Bad Fuel Economy: The ECU may command too much fuel, causing you to visit the gas station more often.
- Black Smoke: In some cases, an overly rich fuel mixture can cause black smoke from the exhaust.
- Hard Starting: The engine may have trouble starting or may stall shortly after starting.
Pro Tip: Check for Vacuum Leaks First!
Before you buy a new sensor, carefully inspect all vacuum lines and intake gaskets. On the S5, a cracked vacuum hose or a bad gasket is a very common cause of MAP sensor codes. A cheap hose can cause the same symptoms as an expensive sensor failure. A mechanic can perform a smoke test to quickly find hidden leaks.
Choosing the Right Aftermarket MAP Sensor
You don't need to buy a sensor from an Audi dealer to get top quality. The key is to choose a brand that is a known Original Equipment Manufacturer (OEM).
- Tier 1 (OEM Equivalent): Bosch is the original manufacturer for many Audi sensors. A Bosch aftermarket part is often the exact same as the genuine part, just without the Audi logo. Delphi is another highly respected OEM supplier with a reputation for quality and reliability. Choosing one of these brands is the safest bet for long-term performance.
- Tier 2 (Reputable Aftermarket): Brands like Hella, VDO (Continental), Standard Ignition (SMP), and NGK produce reliable sensors that are a good alternative to OEM. They may not be the original supplier for this specific part, but they have a long history of quality manufacturing.
- Tier 3 (Budget): Brands like Facet, Holstein, Walker, and various private labels offer a lower price point. While tempting, the quality can be inconsistent. For a critical sensor on a complex German engine, saving a few dollars here can lead to headaches later. It's generally recommended to stick with Tier 1 or Tier 2 brands.
Cost of Replacing an Audi S5 MAP Sensor
| Part Type | Estimated Cost |
|---|---|
| New OEM (Dealer) | $130 - $200+ |
| New Aftermarket (Tier 1) | $60 - $160 |
| New Aftermarket (Tier 2/3) | $35 - $70 |
| Shop Labor | $100 - $200 |
Note: Costs are estimates. The 3.0T engines may have two sensors, which would increase parts cost. Prices vary based on location and supplier.
Frequently Asked Questions
Where is the MAP sensor located on my S5?
It depends on your engine. On the 4.2L V8, it's on the intake manifold. On the 3.0T supercharged V6, there are typically two sensors located on the supercharger assembly. 🎬 See this walkthrough for replacing 3.0T MAP and boost sensors. On the 2018 3.0T turbo V6, there are also two sensors, one on the throttle body inlet pipe and one on the intercooler outlet. 🎬 Watch: Upgrading to 4 bar MAP sensors on the B9 engine. Always verify locations for your specific model year.
Can I clean my MAP sensor?
While some people attempt to clean MAP sensors with electronics cleaner, it is generally not recommended. Unlike a Mass Airflow (MAF) sensor, the sensing element in a MAP sensor is often sealed and not designed to be cleaned. Contamination, especially from oil due to PCV system issues, can cause permanent damage. Replacement is the only reliable fix.
Are there any recalls for the S5 MAP sensor?
No. There are no active recalls or widespread Technical Service Bulletins (TSBs) from Audi for MAP sensor failure on the 2008-2018 S5. Most issues are considered standard diagnosis and repair, often related to vacuum leaks or other engine systems.
Do I need to reset the computer after replacing the sensor?
Yes. After replacing the sensor, it is crucial to clear the stored trouble codes from the ECU using an OBD-II scanner. This will turn off the check engine light and allow the ECU to learn the values from the new sensor. In some cases, a basic settings adaptation may be needed with a more advanced scan tool.
Helpful Videos
Technical Specifications
OEM Part Numbers: 03C906051F 038906051J 07L907386B 06E906051AC 06E906051AG 06E906051AB
4-pin electrical connector. Mounts to intake manifold or supercharger/intercooler piping. Measures absolute pressure to calculate engine load.
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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 S5:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Understanding Your S5's MAP Sensor
- Is it a MAP or a Boost Sensor?
- A Note on Engine Generations
- Symptoms of a Failing MAP Sensor
- Pro Tip: Check for Vacuum Leaks First!
- Choosing the Right Aftermarket MAP Sensor
- Cost of Replacing an Audi S5 MAP Sensor
- Frequently Asked Questions
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