A Guide to the Mass Air Flow Sensor for the 2008-2012 INFINITI EX35
Understanding the unique dual-sensor setup in your EX35 is the first step to fixing common engine problems.
- Your 2008-2012 EX35 has two MAF sensors due to its dual-intake engine; it's best to replace them as a pair.
- Hitachi is the original manufacturer, making it the safest and most reliable aftermarket choice.
- Common symptoms include a rough idle, poor MPG, and hesitation, often with codes P0101, P0171, and P0174.
- Replacement is very easy and DIY-friendly, requiring only basic tools and about 30 minutes.
Symptoms of a Failing MAF Sensor
A dirty or failing MAF sensor can cause a range of noticeable problems in your EX35. Because the computer receives incorrect information about airflow, the engine may run too rich (too much fuel) or too lean (not enough fuel). Look out for these common signs:
- Check Engine Light: This is often the first indicator. The most common trouble code is P0101 🎬 Watch: Step-by-step guide to fixing the common P0101 code, but you may also see lean codes like P0171 and P0174.
- Poor Fuel Economy: An incorrect air-fuel mixture means your engine isn't running efficiently, leading to more trips to the gas station.
- Rough Idle: The engine may shake or vibrate when you're stopped at a light.
- Hesitation or Surging: You might feel the vehicle jerk, hesitate, or surge unexpectedly during acceleration as the engine struggles to find the right power balance.
- Lack of Power: Your EX35 may feel sluggish and have trouble accelerating.
- Black Exhaust Smoke: This is a sign the engine is running too rich, dumping unburned fuel into the exhaust.
- Hard Starting or Stalling: In severe cases, the engine may not start or may stall shortly after starting.
Choosing the Right Aftermarket MAF Sensor
Not all aftermarket sensors are created equal, and Nissan/INFINITI vehicles can be particular about their engine electronics. For a critical component like the MAF sensor, brand quality matters. Here’s a breakdown of your options:
Tier 1: OEM Equivalent
Hitachi: Hitachi is the Original Equipment Manufacturer (OEM) for INFINITI's 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 performance and calibration.
Tier 2: High-Quality Aftermarket
These brands are known for producing reliable electronic components that meet or exceed OE standards.
- Delphi: A major OE supplier for many car brands, Delphi sensors are 100% new (not remanufactured) and are rigorously tested for accuracy.
- NGK/NTK: Known for their spark plugs and oxygen sensors, NGK's sensor line (NTK) is a trusted name that offers a reliable alternative to OEM.
- Standard Ignition (SMP): A long-standing brand in the aftermarket with a reputation for quality engine management parts.
Tier 3: Budget-Friendly Options
Brands like Cardone (often remanufactured), Spectra, Walker Products, and DriveWire offer a lower-cost solution. While they can restore function, their long-term reliability and calibration precision may not match the higher-tier brands. For a sensitive engine like the VQ35HR, it's generally recommended to invest in a Tier 1 or Tier 2 brand to avoid future issues.
Pro Tip: Replace in Pairs
Because your EX35 has two MAF sensors, it is highly recommended to replace them both at the same time. This ensures that both engine banks receive balanced and accurate readings, preventing the ECU from getting conflicting data, which can cause persistent performance problems.
Warning: Avoid Oiled Air Filters
Aftermarket oiled air filters can cause MAF sensors to fail prematurely. The oil can aerosolize and coat the delicate hot wire element of the sensor, leading to inaccurate readings and eventual failure. Stick with high-quality dry paper filters to protect your new sensors.
Cost of Replacing an EX35 MAF Sensor
| Part Type | Estimated Cost (Per Sensor) |
|---|---|
| New Aftermarket | $56 - $197 |
| New OEM (Dealer) | $200 - $300+ |
| Shop Labor | $50 - $100 |
Note: Prices are estimates and can vary based on location and supplier. Labor costs are minimal as replacement is very simple.
Frequently Asked Questions
Can I just clean my MAF sensors instead of replacing them?
Yes, cleaning is a great first step. Use a dedicated MAF sensor cleaner spray and follow the instructions carefully. Never touch the internal wires. 🎬 See how to properly test and replace your sensor If cleaning doesn't resolve the symptoms or the Check Engine Light returns, a replacement is necessary.
Why does my 2008-2012 EX35 have two MAF sensors?
The 3.5L VQ35HR engine in your EX35 has a dual-throttle body intake system, essentially giving it a separate air intake for each bank of cylinders. Each intake requires its own MAF sensor to measure airflow independently for optimal engine performance and efficiency.
Is it difficult to replace the MAF sensors myself?
No, this is one of the easiest DIY jobs. The sensors are easily accessible on the intake tubes right behind the air filter boxes. The job only requires a screwdriver or a small socket to remove two screws and unplugging an electrical connector. The entire process for both sensors should take less than 30 minutes.
🎬 Watch this quick walkthrough of the sensor replacement processAre there any recalls for the EX35 MAF sensor?
No, there are no active recalls from the NHTSA for the Mass Air Flow sensors on the 2008-2012 INFINITI EX35. There is a Technical Service Bulletin (TSB) for some other INFINITI models that can trigger a P0101 code, which recommends an ECM reprogram instead of sensor replacement if there are no drivability issues.
Helpful Videos
Technical Specifications
OEM Part Numbers: 22680-7S000 22680-7S00A 22680-7S00B
Vehicle uses two (2) sensors. The sensor is a 'hot-wire' type that mounts to the air duct with two screws. It is sold as a probe-only insert, without the housing.
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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 EX35:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Symptoms of a Failing MAF Sensor
- Choosing the Right Aftermarket MAF Sensor
- Tier 1: OEM Equivalent
- Tier 2: High-Quality Aftermarket
- Tier 3: Budget-Friendly Options
- Pro Tip: Replace in Pairs
- Warning: Avoid Oiled Air Filters
- Cost of Replacing an EX35 MAF Sensor
- Frequently Asked Questions
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