A Deep Dive into the Mass Air Flow Sensor for the 2008-2013 INFINITI G37
Understanding why your G37 has two MAF sensors and how to choose the right replacement to fix poor idling and restore performance.
- Your G37 has two MAF sensors; it's often best to replace them in pairs.
- Hitachi is the OEM manufacturer; using Hitachi or another high-quality brand like Delphi is strongly recommended to avoid compatibility issues.
- Before replacing, try cleaning the sensors with dedicated MAF cleaner spray as a cheap first step.
- After replacement, reset the ECU by disconnecting the battery or using the pedal-dance method to ensure the car relearns correctly.
Signs of a Failing MAF Sensor on Your G37
When a MAF sensor begins to fail, it sends incorrect data to the ECU. This throws off the air-fuel ratio, leading to noticeable problems. Because your G37 has two sensors, a failure in one can cause a data mismatch that the ECU will flag. Common symptoms include:
- Rough Idle: The engine may shake or sputter when stopped at a light.
- Hesitation and Jerking: During acceleration, the car may stumble or jerk as the ECU struggles to provide the right amount of fuel.
- Poor Fuel Economy: An incorrect air reading can cause the engine to run rich (too much fuel), wasting gas.
- Check Engine Light: The most common codes are P0101 and P010B, which point to a problem with the MAF sensor's performance or a mismatch between the two sensors. 🎬 Watch this walkthrough on replacing sensors for code P0101B.
- Stalling: In more severe cases, the engine may stall shortly after starting or when coming to a stop.
- Black Exhaust Smoke: This is a clear sign the engine is running rich and burning excess fuel.
A Note on Oiled Air Filters
Using aftermarket oiled air filters is a common cause of premature MAF sensor failure on the G37. Excess oil can get drawn into the intake and coat the sensor's delicate hot wire, causing inaccurate readings. If you use oiled filters, be careful not to over-oil them after cleaning.
Choosing the Right Aftermarket MAF Sensor
For many parts, aftermarket options are a great way to save money. However, the G37's engine management system is sensitive, and using a low-quality MAF sensor can cause persistent problems. It is highly recommended to use the original equipment manufacturer part or a high-quality equivalent.
Tier 1: OEM & OEM-Equivalent
- Hitachi: Hitachi is the Original Equipment Manufacturer (OEM) for the G37's MAF sensors. Choosing a Hitachi sensor (part number MAF0102 or similar) is the safest bet for guaranteed compatibility and performance.
- Delphi: Delphi is a well-respected brand that engineers its sensors to meet or exceed OE specifications. They are a strong alternative to the OEM part.
Tier 2: Quality Aftermarket Brands
- NGK/NTK, Spectra, Standard Ignition (SMP): These brands have a reputation for producing reliable sensors. While not OEM, they are generally considered a dependable choice if Hitachi or Delphi are not available.
Tier 3: Budget-Friendly Options
- Cardone, DriveWire, Walker Products: These brands offer a more affordable price point. They can be a viable option for a tight budget, but be aware that their performance and longevity may not match that of the higher-tier brands. For a sensitive car like the G37, it's often worth spending more for a Tier 1 or Tier 2 part to avoid future headaches.
Cost of Replacing INFINITI G37 MAF Sensors
Remember, your G37 requires two MAF sensors. The prices below are typically for a single sensor.
| Part Type | Price Range (Per Sensor) | Notes |
|---|---|---|
| New OEM (Hitachi) | $120 - $215 | The most recommended and reliable option. |
| New Aftermarket | $56 - $197 | Price varies widely based on brand quality. |
| Shop Labor | $50 - $75 | Replacement is very quick, typically taking less than 30 minutes for both. |
Pro Tip: Try Cleaning First
Before buying new sensors, try cleaning your existing ones. Sometimes, a dirty sensor is the only problem. Purchase a can of dedicated Mass Air Flow Sensor Cleaner (do NOT use brake cleaner or other solvents). The process is simple: unplug the sensor, remove two screws, carefully spray the internal wires, and let it dry completely before reinstalling. This $15 attempt could save you hundreds.
🎬 See how to properly clean your MAF sensors and throttle bodies.Frequently Asked Questions
Does my 2009 G37 have one or two MAF sensors?
All 2008-2013 INFINITI G37 models with the 3.7L V6 engine have two mass air flow sensors. They are located on each of the dual air intake tubes leading to the engine.
Can I replace just one MAF sensor?
Yes, you can replace only the faulty sensor. However, since both sensors are the same age and have operated under the same conditions, it's often recommended to replace them as a pair to ensure balanced readings and prevent the other one from failing soon after.
Do I need to reset the computer after replacing the MAF sensors?
It is highly recommended. Resetting the ECU clears the old fuel trim data and allows the computer to immediately learn and adapt to the new, accurate sensor readings. You can do this by disconnecting the negative battery terminal for about 30 minutes or by following a specific pedal procedure for the G37.
🎬 Watch: How to reset your ECU using the pedal procedure.Is there a recall or TSB for the G37 MAF sensor?
There are no active safety recalls. However, there is a Technical Service Bulletin (TSB) for some G37 models that experience P0101/P010B codes. The TSB involves reprogramming the Engine Control Module (ECM) with updated software. If you replace your sensors and the code returns, you may need this ECM update performed by a dealer or qualified shop.
Helpful Videos
Technical Specifications
OEM Part Numbers: 22680-7S000 22680-7S00A 22680-7S00B
The G37 uses two identical 5-pin, hot-wire type MAF sensors, one for each intake bank.
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 G37:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Signs of a Failing MAF Sensor on Your G37
- A Note on Oiled Air Filters
- Choosing the Right Aftermarket MAF Sensor
- Tier 1: OEM & OEM-Equivalent
- Tier 2: Quality Aftermarket Brands
- Tier 3: Budget-Friendly Options
- Cost of Replacing INFINITI G37 MAF Sensors
- Pro Tip: Try Cleaning First
- Frequently Asked Questions
- 🎟️ Get 5% Off