A Deep Dive into the Mass Air Flow Sensor for the 2009-2013 INFINITI FX50
Solving hesitation and poor MPG in your V8 FX50 starts with understanding its two Mass Air Flow sensors.
- Your 2009-2013 FX50 has two MAF sensors; they should be replaced in pairs.
- Hitachi is the original equipment manufacturer (OEM) and the most recommended brand for a reliable fix.
- Before replacing, check TSB ITB13-054d, as an ECM reprogram might be the correct fix for codes P0101/P010B without other symptoms.
- Avoid the cheapest no-name brands, as they are known to cause performance issues in sensitive INFINITI systems.
Is Your FX50's MAF Sensor Failing?
A faulty Mass Air Flow (MAF) sensor can cause a range of frustrating engine problems. Because the sensor's data directly controls the air-fuel ratio, a bad sensor can make your powerful V8 feel sluggish and inefficient. You might notice one or more of the following issues:
- Check Engine Light: This is often the first sign. The system will log codes like P0101, P010B, P0102, or P0103. 🎬 Watch: How to test and replace a faulty MAF sensor
- Poor Acceleration & Hesitation: The vehicle may feel sluggish, hesitate, or jerk when you press the gas pedal.
- Rough Idle: The engine may idle unevenly, vibrate, or even stall when stopped. 🎬 See this quick fix for a rough idling engine
- Reduced Fuel Economy: An incorrect air reading can cause the engine to use more fuel than necessary.
- Hard Starting: The engine may take longer to crank or fail to start at all.
- Black Exhaust Smoke: If the sensor causes the engine to run too rich (too much fuel), you may see black smoke from the tailpipe.
Technical Service Bulletin (TSB) ITB13-054d
INFINITI released a TSB for the P0101 and P010B codes. If your Check Engine Light is on with these codes but you have no drivability problems, the issue may be the engine computer's software, not the sensor itself. The official fix is to have a dealer reprogram the ECM. The bulletin specifically advises against replacing the MAF sensors in this scenario. Always investigate this TSB before spending money on new parts.
Choosing the Right Aftermarket MAF Sensor
When it comes to engine sensors for your INFINITI, brand quality matters. The market is flooded with options, but they are not all created equal. Here’s how to choose the right part and avoid the frustration of a poor-quality replacement.
Tier 1: The OEM Supplier (Best Bet)
Hitachi: Hitachi is the Original Equipment Manufacturer (OEM) for Nissan and INFINITI MAF sensors. Choosing a Hitachi-branded aftermarket sensor is the closest you can get to buying the part from an INFINITI dealer, but at a better price. It is built to the exact factory specifications for calibration and performance, ensuring a plug-and-play fix without the issues common to cheaper brands. For peace of mind and guaranteed compatibility, Hitachi is the top recommendation.
Tier 2: Reputable Aftermarket Brands
Delphi, NGK (NTK), Standard Ignition, Walker Products: These brands have a long-standing reputation for producing quality electronic components that meet or exceed OE standards. They are a solid choice if a Hitachi sensor is not available. These brands invest in proper testing and calibration, making them a reliable alternative to the OEM part.
Tier 3: Budget Brands (Use with Caution)
Cardone (Remanufactured), Spectra, DriveWire: While the lower price is tempting, budget-friendly and remanufactured sensors can be a gamble. Forum discussions and reviews show mixed results; some users have no problems, while others report issues like rough idling, erratic transmission shifting, or the part failing shortly after installation. If you must use a budget brand, be prepared for the possibility that it may not perform as well as a higher-quality unit.
Pro Tip: Replace in Pairs
Your FX50 has two MAF sensors that have aged together. To ensure the engine computer receives balanced and accurate readings from both cylinder banks, it is highly recommended to replace both sensors at the same time. This prevents one new sensor from being mismatched with an old, slightly degraded one, which can still cause subtle performance issues.
| Part Type | Estimated Cost (Per Sensor) | Notes |
|---|---|---|
| New OEM (Hitachi) | $120 - $200+ | The most reliable option. Recommended for best performance. |
| New Aftermarket (Premium) | $90 - $150 | Brands like Delphi, NGK, and Walker offer a good balance of quality and price. |
| New Aftermarket (Budget) | $56 - $90 | Lower cost, but performance and longevity can be inconsistent. |
| Remanufactured (Cardone) | $60 - $100 | A cost-saving option, but quality can vary. |
Frequently Asked Questions (FAQ)
Does my 2009-2013 FX50 have one or two MAF sensors?
Your INFINITI FX50 has two Mass Air Flow sensors. The 5.0L V8 engine features a dual-intake system, with one air filter box and one MAF sensor for each bank of cylinders. You must order two sensors to do the job completely.
Should I try cleaning my MAF sensors first?
You can try cleaning them, but it must be done carefully. Use only a dedicated MAF sensor cleaner spray. Never touch the internal wires or use other chemicals like brake cleaner, as this will permanently damage the sensor. While cleaning sometimes works, many owners find that replacement is the only permanent solution for fixing performance issues.
🎬 Watch: How to clean or replace your Infiniti MAF sensorIs it okay to use a cheap, no-name MAF sensor?
It is not recommended. INFINITI engine computers are sensitive to the data from MAF sensors. Cheaper, poorly calibrated sensors can fail to solve the original problem or even create new ones, like poor shifting or stalling. Sticking with the OEM brand (Hitachi) or a reputable aftermarket alternative is a safer investment.
What is a common mistake when ordering this part?
The most common mistake is ordering only one sensor. Your FX50 requires two. Another mistake is discarding the old mounting screws; new sensors often do not include new hardware, so be sure to keep the original screws.
Helpful Videos
Technical Specifications
OEM Part Numbers: 22680-7S00A 22680-7S00B 22680-7S000
Sensor only; does not include housing. Your vehicle is equipped with two sensors.
We Have This Part in Stock
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 FX50:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your FX50's MAF Sensor Failing?
- Technical Service Bulletin (TSB) ITB13-054d
- Choosing the Right Aftermarket MAF Sensor
- Tier 1: The OEM Supplier (Best Bet)
- Tier 2: Reputable Aftermarket Brands
- Tier 3: Budget Brands (Use with Caution)
- Pro Tip: Replace in Pairs
- Frequently Asked Questions (FAQ)
- 🎟️ Get 5% Off