Guide to the Mass Air Flow Sensor for the 2012-2018 BMW M6
Keep your M6's S63 engine running smoothly by understanding its Mass Air Flow sensors.
- The 2012-2018 BMW M6 has two MAF sensors; they should always be replaced as a pair.
- Bosch is the Original Equipment Manufacturer (OEM) and is the most recommended brand for this critical part to ensure proper performance.
- Failure is often caused by oil contamination from aftermarket oiled air filters or the PCV system.
- Replacement is a very simple DIY job that requires only a Torx screwdriver and takes less than 30 minutes.
Is Your BMW M6's MAF Sensor Failing?
A bad Mass Air Flow (MAF) sensor can cause real problems for your M6's high-performance engine. Because the S63 engine is so finely tuned, even small mistakes in measuring air can lead to poor performance. You might feel the car is slow, idles roughly, or hesitates when you press the gas. Since the engine isn't getting the right air-to-fuel mix, you might also see worse gas mileage or even black smoke from the exhaust if it runs too rich (too much fuel). A faulty MAF sensor will almost always turn on the Check Engine Light.
Oil Contamination is a Common Cause
A frequent reason MAF sensors fail on the M6 is contamination from oil. This can come from the engine's crankcase ventilation (PCV) system or from using aftermarket oiled air filters. 🎬 See a simple fix for common BMW V8 air mass codes. The oil coats the sensor's delicate wire, stopping it from reading airflow correctly. Sometimes, cleaning the sensor with a special MAF sensor cleaner can fix it, but often you will need to replace the sensor.
Choosing the Right Aftermarket MAF Sensor
When it's time to replace your MAF sensors, you have a few choices. It's important to know that the 2012-2018 M6 uses two sensors, and it is highly recommended to replace them as a pair. This ensures the engine computer gets balanced readings from both sides of the engine, which is critical for performance.
Brand Tiers for Your M6
- Tier 1: OEM-Quality (Bosch): Bosch is the Original Equipment Manufacturer (OEM) for BMW's MAF sensors. This means the Bosch sensor you buy from an auto parts store is virtually identical to the one you'd get from a BMW dealership, just without the BMW logo. For a sensitive, high-performance engine like the M6's S63, choosing Bosch is the safest bet for reliability and correct performance.
- Tier 2: Reputable Aftermarket (Delphi): Delphi is another well-known brand that makes quality electronic parts for many cars. While not the original manufacturer for this specific part, their sensors are built to meet factory specifications and are a reliable choice if the OEM part isn't available.
- Tier 3: Value Brands (DriveWire, Global Parts, Vemo): These brands offer a much lower price point. However, for a complex and powerful car like an M6, using a budget sensor is risky. These sensors may not provide the precise readings the ECU needs, which can lead to continued performance issues, poor fuel economy, or even trigger the check engine light again. It's generally recommended to avoid these for such a critical component on this vehicle.
Pro Tip: Always replace your engine air filters when you replace your MAF sensors. A dirty or clogged air filter can restrict airflow and cause the new sensors to read incorrectly.
How Much Does a MAF Sensor Replacement Cost?
Replacing the MAF sensors on a BMW M6 is a straightforward job. Because the sensors are easy to get to, shop labor costs are low. The main cost is the parts themselves. Remember, you will need to buy two.
| Item | Estimated Cost (for two sensors) |
|---|---|
| New OEM (from BMW Dealer) | $600 - $950 |
| New Aftermarket (Bosch OEM-Quality) | $135 - $420 |
| Shop Labor | $30 - $60 |
Frequently Asked Questions (FAQ)
Can I just clean my MAF sensor instead of replacing it?
Sometimes, yes. If the sensor is just dirty from dust or oil, a special MAF sensor cleaning spray might fix the problem. You must use a cleaner made specifically for MAF sensors, as other chemicals can destroy the delicate sensing element. 🎬 Learn how to safely clean or replace your BMW MAF sensor. If the sensor's internal electronics have failed, cleaning won't work, and it must be replaced.
Is this a difficult job to do myself?
No, this is a very easy job for a DIYer. The MAF sensors are on the air intake boxes right on top of the engine and are held in by just two Torx screws. The job involves unplugging the electrical connector, removing the screws, swapping the sensor, and putting it back together. It can be done in less than 30 minutes with basic tools.
🎬 Watch this step-by-step guide to replacing your M6 MAF sensors.Are there any recalls for the 2012-2018 M6 MAF sensor?
No, there are no specific recalls or technical service bulletins (TSBs) from BMW for the Mass Air Flow sensors on the 2012-2018 M6. Always check the NHTSA website with your car's VIN for any open recalls.
Why do I have to replace two sensors?
The S63 V8 engine in your M6 has a separate air intake for each of its two cylinder banks (the two sides of the "V"). Each intake needs its own MAF sensor to measure air. To keep the engine running smoothly, it's important that both sensors provide similar and accurate readings to the computer. Replacing them in pairs ensures this balance.
Helpful Videos
Technical Specifications
OEM Part Numbers: 13627593624 13627602038 13627566990
Hot-film type sensor, 4-pin connector. Two sensors are required for the S63 engine.
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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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