A Guide to the Mass Air Flow Sensor for the 2011-2013 INFINITI M37
Understand the symptoms of a failing MAF sensor in your M37 and learn how to choose the best new aftermarket replacement.
- Your 2011-2013 M37 has two MAF sensors; they should be replaced in pairs to ensure balanced engine performance.
- Hitachi is the Original Equipment Manufacturer (OEM) for INFINITI, making it the most reliable choice for replacement.
- Common failure symptoms include a Check Engine Light (P0101, P010B), engine hesitation, and poor fuel economy.
- Replacement is a simple DIY task that requires only basic tools and can be done in under 30 minutes for both sensors.
Symptoms of a Failing MAF Sensor
When a Mass Air Flow sensor in your M37 starts to fail, it can cause a variety of noticeable problems. Because the engine's computer receives incorrect information, it can't properly manage the air-fuel ratio. This can lead to issues ranging from annoying to serious.
- Check Engine Light: This is often the first sign. The computer will store diagnostic trouble codes (DTCs), commonly P0101 or P010B, 🎬 Watch: Understanding the causes and fixes for P0101 codes which point to a problem with the MAF sensor's performance or circuit.
- Poor Engine Performance: You might feel hesitation or jerking when you accelerate. The engine may feel sluggish, lack power, or even stall, especially when idling or starting.
- Reduced Fuel Economy: If the sensor sends a bad signal, the engine might run "rich" (too much fuel), causing you to visit the gas station more often. You might also notice black smoke from the exhaust.
- Rough Idle: An unstable or vibrating idle is a common symptom as the engine struggles to maintain a consistent air-fuel mixture at low RPMs.
An Important Note on DTCs P0101 and P010B
For some INFINITI vehicles, a Technical Service Bulletin (TSB ITB13-054d) was issued for P0101 and P010B codes that could be resolved by reprogramming the Engine Control Module (ECM). Before replacing the sensors, it's worth checking with a dealership or qualified shop to see if this TSB applies to your vehicle, as it could be a software issue rather than a hardware failure. However, if you are experiencing clear drivability issues, sensor failure is more likely.
Choosing the Right Aftermarket MAF Sensor
When replacing the MAF sensors on your M37, you have several options. Since these sensors are vital for engine health, choosing a quality part is important. For sensitive electronics, sticking close to the original equipment (OE) quality is a safe bet.
Brand Quality Tiers
- OEM Supplier (Best Choice): Hitachi is the original equipment manufacturer for many Nissan and INFINITI parts, including MAF sensors. Choosing a Hitachi sensor (like model MAF0031) ensures you get the same quality, fit, and performance as the part your car came with from the factory.
- Premium Aftermarket (Good Choice): Brands like Delphi, NGK, and Standard Ignition (SMP) have strong reputations for producing reliable electronic components that meet or exceed OE specifications. Delphi, in particular, is a long-time OE supplier for many automakers and is known for its quality.
- Value-Oriented Aftermarket (Use with Caution): Brands like Spectra, DriveWire, and Walker Products offer more budget-friendly options. While they can work, some user forums report inconsistent performance with cheaper electronic sensors, leading to issues like rough idling or incorrect shifting behavior.
- Remanufactured (Consider the Risks): A brand like Cardone offers remanufactured MAF sensors. These are original units that have been rebuilt and tested. While they can offer significant cost savings, the reliability of remanufactured electronics can sometimes be inconsistent.
Pro Tip: Your 2011-2013 M37 has two MAF sensors. It is highly recommended to replace them as a pair. This ensures that both engine banks are receiving balanced and accurate airflow readings, preventing codes like P010B which indicate a mismatch between the two sensors.
Cost of Replacing an M37 MAF Sensor
The cost can vary significantly based on the brand of the part and whether you do the work yourself.
| Part/Service | Estimated Cost |
|---|---|
| New OEM Sensor (Each) | $220 - $355 |
| New Aftermarket Sensor (Each) | $56 - $198 |
| Shop Labor | $45 - $100 |
Frequently Asked Questions
Does my 2011-2013 M37 have one or two MAF sensors?
Your M37 has two MAF sensors. Because the 3.7L V6 engine uses a dual air intake system, there is one sensor located on each air filter housing after the filter.
Can I just clean my MAF sensors instead of replacing them?
Cleaning the MAF sensor wires with a dedicated MAF sensor cleaner is a possible first step if you're experiencing issues. Sometimes, contamination is the only problem. However, this is often a temporary fix. If the sensor's electronics are failing, cleaning will not solve the problem 🎬 Watch: How to properly clean your MAF sensor and throttle body and replacement will be necessary.
What happens if I don't replace a bad MAF sensor?
Ignoring a failing MAF sensor can lead to persistently poor fuel economy, rough engine operation, and stalling. In the long term, running an engine too rich (with too much fuel) can damage expensive components like the catalytic converters.
Is this a difficult part to replace myself?
No, this is a very easy DIY job. The sensors are easily accessible on top of the air filter boxes. The replacement involves unplugging an electrical connector and removing two screws. Most owners can complete this in under 15 minutes per sensor 🎬 See this quick walkthrough on replacing your Infiniti MAF sensor with basic hand tools.
Helpful Videos
Technical Specifications
OEM Part Numbers: 22680-1MB0A
Dual sensor system (one per intake). Sensor element only, no housing. 5-pin electrical 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.
- INFINITI M37: