Guide to the 2016-2020 Audi A4 Manifold Absolute Pressure (MAP) Sensor
Understand the signs of a failing MAP sensor in your B9 A4 and how to choose the right replacement part.
- A bad MAP sensor on a 2016-2020 Audi A4 typically causes a rough idle, poor acceleration, and a Check Engine Light with code P0106.
- Replacement is a simple DIY task for many, located on the intake manifold and usually held by one or two screws.
- Before replacing, try cleaning the sensor with electronics cleaner, as buildup can cause faulty readings.
- While value brands are available, choosing an OE-supplier like Bosch or a premium aftermarket brand like Vemo is recommended for this critical sensor.
Is Your Audi A4's MAP Sensor Failing?
A faulty Manifold Absolute Pressure (MAP) sensor can cause a range of noticeable engine problems. If the sensor sends incorrect information to the engine's computer, it can disrupt the delicate air-fuel balance required for your turbocharged engine to perform correctly. Ignoring these symptoms can lead to reduced performance, poor fuel economy, and potentially more expensive repairs down the line.
Key Symptoms of a Bad MAP Sensor:
🎬 Watch this video to learn common MAP sensor failure symptoms.- Check Engine Light: This is often the first sign. A scanner will typically show fault codes like P0106, which points to a MAP sensor performance problem. 🎬 See how one owner solved a P0106 code and power loss.
- Poor Engine Performance: You might feel sluggish acceleration, hesitation, or a general lack of power. This happens because the engine isn't getting the right fuel mixture for the amount of air (and boost) it's receiving.
- Rough Idle: An unstable idle, where the engine RPMs fluctuate or the car shakes, is a common symptom.
- Decreased Fuel Economy: If the sensor causes the engine to run rich (too much fuel), you'll notice you're visiting the gas station more often.
- Black Smoke from Exhaust: In cases where the engine is running very rich, unburnt fuel can exit through the exhaust as black smoke.
Known Issues for the 2016-2020 Audi A4
While no specific recalls or widespread Technical Service Bulletins (TSBs) exist for MAP sensor failure on the B9 platform A4, related issues can cause similar symptoms. Problems like carbon buildup on intake valves, vacuum leaks, or failing turbocharger wastegates can also cause rough idle and power loss. It's important to properly diagnose the issue before replacing parts. A diagnostic scan is the best first step.
Choosing a New Aftermarket MAP Sensor
When replacing the MAP sensor on your A4, you have a choice between OEM (Original Equipment Manufacturer) and aftermarket parts. For a critical sensor like this, quality is important.
- OEM/OE Supplier: The original part is often made by a brand like Bosch. Choosing an OE-supplier part, even if it comes in a different box, ensures you get the same quality and performance as the original without the dealership price tag.
- Premium Aftermarket (Vemo): Vemo is a German brand known for producing quality replacement parts that often meet or exceed OEM standards. They are a reliable choice for European vehicles.
- Standard Aftermarket (Walker Products): Walker is a well-established aftermarket brand that produces a wide range of sensors. Their parts are designed to be direct-fit replacements and offer a balance of quality and value.
- Value-Oriented (Global Parts): Brands like Global Parts Distributors (gpd) offer a more budget-friendly option. While they are manufactured to OE standards, long-term reliability may vary compared to premium brands.
Pro Tip: Clean Before You Replace
Sometimes, a MAP sensor can become clogged with oil or carbon deposits, causing it to send faulty readings. Before buying a new part, you can try removing the sensor and cleaning it carefully with a dedicated MAF or electronics cleaner. If cleaning resolves the issue, you've saved yourself the cost of a new part.
Cost of Replacing an Audi A4 MAP Sensor
The total cost depends on the part you choose and whether you do the job yourself or hire a professional. The replacement is relatively simple for those with basic DIY skills.
| Part/Service | Estimated Cost |
|---|---|
| New OEM Part | $40 - $65 |
| New Aftermarket Part | $77.35 - $165.09 |
| Shop Labor | $49 - $72 |
| Total Professional Replacement | $239 - $262 |
Frequently Asked Questions
Where is the MAP sensor located on a 2016-2020 Audi A4?
The MAP sensor is typically located on the intake manifold. On the 2.0T engine, you can often find it mounted on the plastic intake piping, making it relatively easy to access after removing the engine cover.
Is it difficult to replace the MAP sensor myself?
For most DIYers, this is a straightforward job. It usually involves unplugging an electrical connector and removing one or two screws (often a Torx T20 or T30). The main challenge can be reaching the sensor if it's in a tight spot. The entire process should take less than an hour.
🎬 Follow this step-by-step guide to replace your Audi's MAP sensor.What is the difference between a MAP and a MAF sensor?
Your A4 uses both. The Mass Airflow (MAF) sensor measures the volume of air entering the engine, while the Manifold Absolute Pressure (MAP) sensor measures the pressure (or vacuum) of that air in the manifold. Both are critical for calculating the correct air-fuel ratio, but they measure different things.
Are there any recalls for the MAP sensor on the 2016-2020 Audi A4?
No, there are no active recalls from Audi or NHTSA specifically for the MAP sensor on this vehicle generation.
Helpful Videos
Technical Specifications
OEM Part Numbers: 038906051R W0133-2070208
4-Pin Connector
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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.
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