2015 INFINITI Q40 Mass Air Flow Sensor: A Comprehensive Guide
Understanding and replacing the Mass Air Flow sensors on your Q40's 3.7L V6 engine.
- Your 2015 Q40 has two MAF sensors; it's best to replace them as a pair for balanced performance.
- Hitachi is the Original Equipment Manufacturer (OEM); buying a Hitachi aftermarket part is a reliable and cost-effective choice.
- Before replacing, try cleaning both sensors with dedicated MAF sensor cleaner, as this often resolves the issue.
- Check for TSB ITB13-054d; if your only symptom is a Check Engine Light, you may only need an ECM reprogram from a dealer.
Is Your Q40 Running Rough? It Could Be the MAF Sensors.
If your 2015 INFINITI Q40 is experiencing symptoms like a shaky idle, poor acceleration, a drop in fuel economy, or a Check Engine Light, the Mass Air Flow (MAF) sensors are a common culprit. These sensors get dirty over time or can fail, sending incorrect information to the engine's computer. This guide will walk you through the symptoms, how to choose the right replacement parts, and what to expect from the repair.
A Critical Detail for Q40 Owners
Your Q40's 3.7L V6 engine has two Mass Air Flow sensors, one for each intake bank (Bank 1 on the passenger side, Bank 2 on the driver's side). While you only need to replace the one that has failed, it is often recommended to replace them in pairs, especially on a higher-mileage vehicle, to ensure balanced readings and performance.
Symptoms of a Failing MAF Sensor
A bad MAF sensor can cause a variety of issues, from annoying to serious. Here’s what to look for:
🎬 Watch: 11 common symptoms of a failing MAF sensor- Check Engine Light: This is the most common sign. You'll likely see codes like P0101 or P010B.
- Rough Idle or Stalling: The engine may shake, idle erratically, or even stall at stops because the air-fuel mixture is wrong.
- Poor Acceleration and Power Loss: The car may feel sluggish, hesitate, or lack power when you step on the gas.
- Decreased Fuel Economy: An incorrect air reading often causes the ECU to inject too much fuel, leading to more trips to the gas station.
- Black Smoke from Exhaust: In some cases, a very rich fuel mixture (too much fuel) can result in black smoke from the tailpipe.
Known Issues: TSB ITB13-054d
INFINITI released Technical Service Bulletin ITB13-054d for the 2015 Q40, among other models. This TSB addresses a situation where the Malfunction Indicator Lamp (MIL) comes on with DTC P0101 and/or P010B stored, but there are no actual drivability issues. The fix is not to replace the MAF sensor, but to have an INFINITI dealer reprogram the Engine Control Module (ECM). If your Check Engine Light is on but the car drives perfectly fine, you should investigate this TSB before buying new parts.
Choosing the Right Aftermarket MAF Sensor
When it comes to electronic sensors for your INFINITI, quality matters. Using a low-quality aftermarket part can lead to persistent problems or even new ones. Here’s a breakdown of the brands available, tiered by quality and reputation among INFINITI owners.
| Tier | Brands | Assessment |
|---|---|---|
| OEM / Top Tier | Hitachi, NGK, Delphi | Hitachi is the original equipment manufacturer (OEM) for Nissan/INFINITI. Choosing a Hitachi-branded aftermarket sensor is the safest bet for guaranteed compatibility and performance. Delphi and NGK are also highly respected OE suppliers with a reputation for producing reliable sensors that meet or exceed factory specifications. |
| Mid-Grade / Reputable | Standard Ignition, Hella, Walker Products | These brands are well-established in the aftermarket. They generally offer good quality and can be a reliable, cost-effective alternative to the top-tier brands. However, for sensitive electronics like a MAF sensor on an INFINITI, sticking with an OEM supplier is often worth the small extra cost. |
| Budget / Remanufactured | Cardone, DriveWire, Spectra | These brands offer the lowest price point. Cardone often sells remanufactured parts, which can be hit-or-miss. While budget parts can be tempting, forum discussions often show owners having issues with cheaper sensors, leading them to eventually buy an OEM brand anyway. It's generally advised to avoid these for critical engine sensors on your Q40. |
Frequently Asked Questions (FAQ)
Should I try cleaning my MAF sensors first?
Yes, this is a great first step and can often solve the problem for the cost of a can of MAF sensor cleaner. 🎬 See how to safely clean or replace your sensors A dirty sensor can cause the same symptoms as a failed one. Be sure to use a cleaner specifically designed for MAF sensors—do not use brake cleaner or other harsh chemicals, as they will destroy the delicate sensor elements. Also, never touch the internal wires of the sensor.
Do I need to replace both MAF sensors at the same time?
It's highly recommended. Since the sensors have aged together, the other is likely not far from failing. Replacing them in pairs ensures the engine computer receives balanced and accurate airflow readings from both cylinder banks for smooth operation.
Is there a recall for the MAF sensor on the 2015 Q40?
No, there are no open recalls from the NHTSA for the Mass Air Flow sensor on the 2015 INFINITI Q40. However, there is a Technical Service Bulletin (ITB13-054d) that may apply if you have a check engine light without any performance problems.
Do I need to perform an 'idle relearn' after replacement?
It is a good practice. After replacing the sensors or disconnecting the battery, the engine's idle may be unstable. An Idle Air Volume Learning (IAVL) procedure helps the ECU recalibrate to the new sensors. This procedure can be done with an advanced scan tool or by following a specific sequence of steps 🎬 Watch: How to perform the Infiniti idle relearn procedure (often found in forums or service manuals). Sometimes, simply letting the car idle for 15-20 minutes will allow it to adjust.
Helpful Videos
Technical Specifications
OEM Part Numbers: 22680-7S000 22680-7S00A 22680-7S00B
The VQ37VHR engine uses two identical 5-pin MAF sensors, one for each air intake assembly.
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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 Q40: