2013 INFINITI EX37 Mass Air Flow Sensor Guide and Common Issues
Experiencing rough idling, poor gas mileage, or a check engine light in your EX37? Your Mass Air Flow sensors might be the problem.
- Your 2013 EX37 has two MAF sensors; it's best to replace them as a pair.
- Hitachi is the OEM manufacturer; buying a Hitachi-branded sensor is the best value for OEM quality.
- Check for TSB ITB13-054d if you have P0101/P010B codes but no driving issues, as an ECM reprogram may be the fix.
- Replacement is a very simple DIY task that can be done in under 30 minutes with basic tools.
Understanding MAF Sensor Issues in Your 2013 EX37
The VQ37VHR engine in your 2013 EX37 is a high-performance V6 that relies on precise data to run correctly. Because it has dual air intakes, it requires two Mass Air Flow (MAF) sensors. When one or both of these sensors start to fail or get dirty, they send incorrect information to the engine's computer. This can lead to a variety of noticeable performance problems. While a sensor can fail outright, issues often start with contamination from dirt or oil, which can sometimes be resolved by cleaning.
Important TSB Information for P0101/P010B Codes
Infiniti has issued a Technical Service Bulletin (TSB), reference ITB13-054d, for the 2013 EX37. This TSB addresses situations where the Malfunction Indicator Lamp (Check Engine Light) is on with DTC codes P0101 and/or P010B, but there are no other drivability problems. The official fix is to reprogram the Engine Control Module (ECM), not to replace the MAF sensors. If your vehicle is showing these codes without other symptoms, consult a dealer or qualified shop about this ECM reprogram 🎬 Watch this step-by-step guide on fixing the common P0101 code. before purchasing new sensors.
Common Symptoms of a Failing MAF Sensor
A bad MAF sensor can trick the engine into using too much or too little fuel. This results in several common symptoms:
- Check Engine Light: This is often the first sign. Common codes include P0101 (MAF Circuit Range/Performance) and P010B (MAF Circuit Range/Performance Bank 2).
- Rough Idle: The engine may shake or vibrate when stopped.
- Poor Fuel Economy: The engine may run rich (too much fuel), causing you to visit the gas station more often.
- Hesitation or Lack of Power: Your EX37 may feel sluggish when you accelerate.
- Stalling: In more serious cases, the engine may stall, especially when idling.
- Black Smoke from Exhaust: This is a sign of the engine running too rich, burning excess fuel. 🎬 See a detailed breakdown of these 11 bad MAF sensor symptoms.
Choosing the Right Aftermarket MAF Sensor
When it comes to electronic sensors for your Infiniti, quality matters. While saving money is always a goal, a cheap, low-quality sensor can fail quickly or provide inaccurate readings, causing persistent problems. Here’s a breakdown of your options:
Tier 1: OEM Quality
Hitachi is the Original Equipment Manufacturer (OEM) for many Nissan and Infiniti parts, including the MAF sensor for your EX37. Choosing an aftermarket Hitachi sensor (like model MAF0031) is like buying the genuine dealer part without the Infiniti logo and price markup. This is the most recommended option for reliability and performance that matches the original part. Brands like Delphi and NGK (NTK) also have a strong reputation for producing high-quality electronic sensors that meet or exceed OEM standards.
Tier 2: Reputable Aftermarket Brands
Brands like Standard Ignition (SMP), Walker Products, and Beck Arnley are well-known in the aftermarket industry. They offer a good balance of quality and price. While generally reliable, they may not have the same exact calibration or longevity as an OEM-tier part like Hitachi.
Tier 3: Budget-Focused Brands
Brands like Cardone (often remanufactured), DriveWire, and other store-brand options are typically the most affordable. While the low price is tempting, these parts can be a gamble. They may have a shorter lifespan or less precise calibration, potentially leading to recurring check engine lights or performance issues. For a sensitive component like a MAF sensor on a performance-oriented engine, it's generally wise to invest in a higher-tier brand.
A Note on Cleaning vs. Replacing
Before you replace your MAF sensors, it's often worth trying to clean them with a dedicated MAF sensor cleaner spray. Sometimes, a dirty sensor wire is the only problem. However, if cleaning doesn't solve the issue, or if the sensor has failed electronically, replacement is necessary. Never touch the delicate sensor wires with your fingers or a brush.
Cost of Replacing MAF Sensors on a 2013 INFINITI EX37
Remember, your EX37 has two MAF sensors. The prices below are typically for a single sensor.
| Part Type | Estimated Cost (per sensor) |
|---|---|
| New OEM (Infiniti Dealer) | $250 - $350+ |
| New Aftermarket (OEM-Tier like Hitachi) | $80 - $140 |
| New Aftermarket (Other Brands) | $56 - $197 |
| Shop Labor | $50 - $100 |
Frequently Asked Questions
Do I have to replace both MAF sensors at the same time?
It is highly recommended. Since both sensors are the same age and have been exposed to the same conditions, the other is likely to fail soon if one has already gone bad. Replacing them in pairs ensures balanced readings between the two engine banks, which is critical for the VQ37VHR engine.
Is this a difficult part to replace myself?
No, this is a very easy DIY job for most owners. The MAF sensor is located on the air intake tube right after the air filter box. It's held in by two screws and an electrical connector. The entire process for both sensors should take less than 30 minutes with basic hand tools like a screwdriver.
🎬 Learn how to clean or replace your Infiniti MAF sensor.What happens if I ignore a bad MAF sensor?
Ignoring a bad MAF sensor can lead to more serious problems. Persistently running too rich can damage your catalytic converters, which is a very expensive repair. It also leads to poor performance, bad fuel economy, and the inability to pass emissions tests.
Do I need to reset the computer after replacing the sensors?
Yes, after installing the new sensors, it's best to clear the check engine light codes with an OBD2 scanner. You may also want to perform an Idle Air Volume Learning procedure, which helps the car's computer adjust to the new, accurate readings from the sensors. Procedures for this can be found in the service manual or online.
Helpful Videos
Technical Specifications
OEM Part Numbers: 22680-7S000 22680-7S00A
The VQ37VHR engine in the 2013 EX37 uses two separate MAF sensors, one for each of the dual throttle bodies and intake paths.
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 EX37:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Understanding MAF Sensor Issues in Your 2013 EX37
- Important TSB Information for P0101/P010B Codes
- Common Symptoms of a Failing MAF Sensor
- Choosing the Right Aftermarket MAF Sensor
- Tier 1: OEM Quality
- Tier 2: Reputable Aftermarket Brands
- Tier 3: Budget-Focused Brands
- A Note on Cleaning vs. Replacing
- Cost of Replacing MAF Sensors on a 2013 INFINITI EX37
- Frequently Asked Questions
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