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Choosing the right throttle body for an Infiniti FX35 matters because it directly affects throttle response, idle stability, and drivability. A correctly selected unit restores consistent airflow, reduces hesitation, and can resolve common running issues related to the intake control system. This guide covers a short list of top picks for the FX35, each chosen for build quality and functional fit. Below you will find the shortlisted throttle bodies and the criteria used to evaluate them, including fitment, airflow characteristics, and electrical compatibility. Read on to see which options match your goals and installation preferences.
Looking for other parts? See all Infiniti FX35 parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | A-Premium Electronic Throttle Body Assembly with Throttle Position Sensor for Infiniti FX35 (fits related Nissan/Infiniti 3.5L) |  |
| Most Popular A crowd favorite that many people choose with confidence | DOSKJOK Electronic Throttle Body Assembly for Infiniti FX35 (3.5L V6) |  |
| Best Quality Built to a higher standard if you want something more solid | Hitachi ETB0005 Electronic Throttle Body |  |
| Best Budget The cheapest option that still gets the job done reliably | IRONTREE S20058 Electronic Throttle Body compatible with Infiniti FX35 3.5L |  |
| Most Sold A high-volume bestseller chosen again and again | Dorman 977-784 Fuel Injection Throttle Body with Hall Effect Sensor |  |
| Best Value for Money The sweet spot between price and what you get | Magorfas Electronic Throttle Body for Infiniti FX35 V6 3.5L (2003–2008) |  |
| Best Overall The best all-around choice for most situations | Hitachi ETB0008 Electronic Throttle Body |  |
1. A-Premium Electronic Throttle Body Assembly with Throttle Position Sensor for Infiniti FX35 (fits related Nissan/Infiniti 3.5L)
| Material | Aluminum |
|---|---|
| Terminal Count | 6 |
| Throttle Position Sensor | Included |
| Throttle Body Type | Electric |
This A-Premium electronic throttle body replaces the factory unit and includes a built-in throttle position sensor and six-terminal blade connector for direct vehicle wiring. It is used to restore smooth idle, throttle response, and driveability after a failing or sticking throttle body. The aluminum housing and flange-mount design match the original mounting style so installation follows the factory footprint, and several verified buyer reports note straightforward fit and function when the ECM was recalibrated afterward. Practical benefits include the integrated sensor so you do not need separate parts and the commonly referenced reference numbers for confirming compatibility with Infiniti FX35 2003-2008 V6 3.5L. Important limitations are that some vehicles require an ECU/ECM recalibration or relearn procedure after installation and that aftermarket parts can vary from factory tolerances, so professional installation and verification are recommended for trouble-free operation.
Best for: Reliability-focused buyers who prioritize returning an FX35 to dependable, factory-like throttle response rather than seeking performance upgrades.
Less Ideal for: If you want a performance or high-flow upgrade beyond factory characteristics or prefer parts with OEM branding and documented dyno gains, consider aftermarket performance units or factory-brand replacements.
- Includes throttle position sensor so no separate TPS purchase is needed.
- Aluminum housing and flange mount that follow factory mounting for straightforward replacement.
- Matches multiple known reference numbers to help verify fit for FX35 2003-2008.
- Six-terminal blade connector compatible with factory wiring harnesses.
- Some installations require ECM recalibration or throttle relearn to avoid drivability issues.
- Aftermarket fitment may vary slightly from factory-quality tolerances.
- No explicit installation hardware or detailed instructions included in the package contents.
Verdict A practical, reliability-minded replacement throttle body for the Infiniti FX35 that includes the TPS but may need ECM recalibration after installation.
2. DOSKJOK Electronic Throttle Body Assembly for Infiniti FX35 (3.5L V6)
| Compatible Engine | 3.5L V6 |
|---|---|
| Applicable Model | Infiniti FX35 |
| Manufacturer Part Number | TB-066 |
| OEM Part Numbers Listed | 16119-8J103 and related numbers |
This DOSKJOK electronic throttle body is a plug-and-play replacement intended for 3.5L V6 Infiniti FX35 model years listed by the manufacturer. It replaces a failing throttle actuator to resolve symptoms like engine stalling, limp mode, throttle warning lights, hesitation, or surging during acceleration. Installation is straightforward for a competent DIYer or technician because the part is made to fit the factory mounting points and wiring without modification. The listing states the unit is fully tested before leaving the factory, which suggests functional calibration and ready-to-use operation on compatible vehicles. Practical benefits include quick symptom resolution and a faster return to normal drivability compared with lengthy diagnostics or rebuilds. Important limitations are fitment sensitivity and the need to confirm vehicle year and part number before purchase; some buyers report the gasket is not included so expect to source a seal separately. Also, as an aftermarket part, minor differences in finish or connector clips compared with factory parts are possible.
Best for: Convenience-driven buyers who prioritize a quick, ready-to-install replacement to restore normal throttle operation on their Infiniti FX35 without lengthy troubleshooting.
Less Ideal for: Owners who prefer OEM parts from the vehicle manufacturer or those seeking a remanufactured unit with an included gasket and factory paperwork should consider other options.
- Designed to directly replace the factory throttle body on listed FX35 models for straightforward installation
- Manufacturer reports 100% factory testing to reduce the chance of dead-on-arrival units
- Addresses common driveability issues: stalling, limp mode, hesitation and throttle warning lights
- Gasket is not included with the unit requiring an additional purchase for a complete install
- Fitment is vehicle-specific so incorrect year/model selection will prevent proper installation
Verdict A practical plug-and-play aftermarket throttle body for FX35 owners who want a fast, tested replacement to restore throttle performance, but buy a gasket separately and double-check fitment.
3. Hitachi ETB0005 Electronic Throttle Body
| Brand | Hitachi |
|---|---|
| Material | Aluminum, Plastic |
| Output Type | electrical signal |
| Manufacturer Part Number | ETB0005 |
| OEM Part Number | 16119-JK20A, 16119-JK20C |
The Hitachi ETB0005 is a vehicle-specific electronic throttle body intended to replace a failed unit on Infiniti FX35 models and restore factory throttle control. It combines a sealed electronics module, an accurate throttle position sensor circuit, and a fast electric motor to maintain precise airflow metering and smooth idle behavior. In practice this part is used as a direct replacement during repairs or engine tuning reversions and typically installs in the factory mounting location with OEM-style connectors. Notable features include sealed electronics to resist contamination, precision TPS circuitry for consistent engine mapping, and machined aluminum construction for durability. Benefits are improved drivability, reduced hesitation at low RPM, and predictable response for performance-focused owners. Limitations include the need for proper synchronization or ECU programming on some FX35s after installation and the expectation that fitment is vehicle-specific so it is not a universal upgrade option.
Best for: Performance-oriented Infiniti FX35 owners who prioritize restoring precise throttle response and factory-calibrated engine behavior after a failing throttle body.
Less Ideal for: Buyers seeking a universal upgrade for multiple vehicles or a plug-and-play performance enhancement without possible ECU synchronization should consider other options.
- Factory-quality design intended to match original throttle mapping for Infiniti FX35
- Sealed electronics reduce risk of contamination-related failures
- Precision TPS circuitry supports stable idle and consistent fuel mapping
- Machined aluminum body for durability under engine bay conditions
- May require dealer-level synchronization or ECU flashing after replacement on some FX35s
- Not a universal fit so correct OEM part number confirmation is necessary
Verdict A factory-quality replacement that restores accurate throttle control on Infiniti FX35s but may need ECU syncing after installation.
4. IRONTREE S20058 Electronic Throttle Body compatible with Infiniti FX35 3.5L
| Compatible Engine | 3.5L V6 |
|---|---|
| Preassembled Components | Throttle plate, sensors, idle control, actuator motor |
| Manufacturer Part Number | TS20058 |
This IRONTREE S20058 throttle body is a budget-focused, direct-replacement unit for the Infiniti FX35 3.5L that arrives with the throttle plate, position sensors, idle control and actuator motor preinstalled. It plugs into the factory wiring harness and is used to restore proper air metering and throttle response when the original unit fails or triggers a driveability code. The listing emphasizes computer testing and upgraded internal components to match factory performance, and several owner reports note straightforward bolt-on fitment and successful throttle relearn procedures. Practical benefits include lower cost compared with dealer replacements and a ready-to-install assembly that reduces bench work. Important limitations are variable quality control across units and occasional DOA or fitment issues reported by some buyers, so expect to verify fit and be prepared for a return if the part is defective. Professional installation or basic mechanical skill for throttle relearn steps is recommended to ensure reliable operation.
Best for: Budget-conscious Infiniti FX35 owners who need a cost-effective, ready-to-install replacement throttle body to restore drivability without paying dealer prices.
Less Ideal for: Owners seeking a guaranteed long-term OEM factory replacement or those unwilling to handle a possible return or have the part professionally inspected before installation.
- Direct replacement designed to plug into the factory wiring harness with preassembled sensors and actuator for easier install
- Lower price than dealer or OEM units making it a cost-effective repair option
- Manufacturer reports computerized testing and upgraded internal components intended to match or exceed factory performance
- Quality control appears inconsistent with some reports of defective units on arrival
- Not backed by the original manufacturer so long-term durability may vary
Verdict A wallet-friendly direct-replacement throttle body for the FX35 that can restore performance quickly but carries some risk of inconsistent unit quality.
5. Dorman 977-784 Fuel Injection Throttle Body with Hall Effect Sensor
| Brand | Dorman |
|---|---|
| Model | Dorman 977-784 |
| Construction | 100% new aluminum |
| Sensor type | Contactless Hall effect |
| Testing | Over 1 million cycle endurance testing |
This Dorman throttle body is a direct replacement-style unit designed to restore electronic throttle control when the factory part has failed. It uses a contactless Hall effect position sensor and a proprietary Sensor Shield butterfly shaft seal to keep oil and contaminants out of the electronics, which addresses two common causes of throttle body failure. The part is 100% new aluminum construction rather than remanufactured, and Dorman reports extensive durability testing including long cycle counts and vehicle try-on. Typical use is bolt-in replacement and reprogramming or relearn where required by the vehicle, returning smooth idle and throttle response when the original has developed faults. Practical benefits include reduced chance of repeat failure from worn sensor contacts and contamination, plus the convenience of a new unit without a core charge. Important limitations are that some users may still need calibration or relearn procedures after installation and exact fitment must be confirmed for the FX35 before purchase as compatibility varies by year and trim.
Best for: Risk-averse mainstream buyers who prioritize a durable, factory-replacement style repair and want a long-lasting fix rather than a temporary or remanufactured part.
Less Ideal for: Shoppers seeking a direct OEM part number match or those unwilling to perform or pay for required throttle relearn procedures should consider other options.
- Contactless Hall effect sensor reduces wear-related failures compared with contact sensors
- Sensor Shield shaft seal helps prevent oil and contaminant intrusion into electronics
- 100% new construction rather than remanufactured for predictable longevity
- Endurance-tested with high cycle counts and vehicle try-on validation
- May require throttle relearn or calibration after installation to clear codes and restore driveability
- Fitment can vary by model year and trim so verification is required before ordering
Verdict A robust, newly manufactured replacement built to avoid common sensor and contamination failures, but confirm FX35 fitment and expect a relearn step after installation.
6. Magorfas Electronic Throttle Body for Infiniti FX35 V6 3.5L (2003–2008)
| Manufacturer | Magorfas |
|---|---|
| Compatible vehicle | Infiniti FX35 V6 3.5L 2003-2008 |
| Connector | 6-pin |
| Material | Aluminum |
This Magorfas electronic throttle body is a replacement part designed to restore electronic throttle control on the Infiniti FX35 V6 3.5L (2003–2008). It replaces factory throttle assemblies that have worn sensors or sticking butterflies and is installed in the intake tract where it measures and controls airflow via an electric motor and position sensor. The unit is aluminum for corrosion and heat resistance and uses a 6-pin connector to match factory wiring; the listing specifies compatibility with Infiniti FX35 fitment and several Nissan variants. In use you will install, reconnect the electrical and vacuum lines, then follow the initialization step to allow the throttle to relearn its baseline position. Practical benefits include a cost-effective alternative to dealer parts and a fit intended for direct swap-in, which can quickly resolve idle, hesitation, or throttle response faults. Limitations are that it requires proper initialization and electrical compatibility checks and it is an aftermarket component rather than a factory-sourced assembly, which may affect long-term durability compared with higher-end replacements.
Best for: Practical optimizers who want a cost-conscious, functional replacement to restore throttle operation on an Infiniti FX35 without paying dealer prices.
Less Ideal for: Owners seeking an OEM-identical, long-warranty factory replacement or those unwilling to perform or verify the required initialization and electrical checks should consider other options.
- Designed to fit Infiniti FX35 3.5L 2003–2008 for a direct replacement installation
- Aluminum construction resists heat and corrosion for longer service life
- 6-pin electrical connector matches factory wiring for plug-and-play fitment
- Lower-cost aftermarket option compared with dealer replacement throttle bodies
- Aftermarket unit may not match long-term durability of higher-end factory-quality parts
- Requires correct initialization procedure and stable battery voltage to complete self-learning
Verdict A budget-friendly, aluminum aftermarket throttle body that restores throttle function on the Infiniti FX35 but requires proper initialization and may not match OEM longevity.
7. Hitachi ETB0008 Electronic Throttle Body
| Material | Aluminum, Plastic |
|---|---|
| Mounting Type | Flange Mount |
| Output Type | Electric |
| Manufacturer Part Number | ETB0008 |
| OEM Part Number | 16119-JK20B, 16119-JK20D |
The Hitachi ETB0008 is an electronic throttle body built to replace a factory unit on the Infiniti FX35, restoring precise air intake control and smooth idle behavior. It uses a sealed throttle position sensor circuit and a fast-response electric motor to maintain accurate throttle mapping for better fuel economy and emissions control. In practice the unit is a direct replacement that installs in the stock location and is typically followed by an ECU relearn or programming step to synchronize with the vehicle. Buyers report reliable OEM-like fit and drivability after installation, with advantages for anyone repairing limp-home throttle symptoms or irregular idle. Some users experienced early failures or needed dealer-level reprogramming to fully sync dual throttle setups, so plan for a relearn procedure or a shop visit if the car sets codes after fitment. The product’s machined exterior and factory part numbers indicate it is produced to meet manufacturer specifications for the FX35, making it a solid choice when you want factory-quality replacement without sourcing a dealer part.
Best for: A balanced all-round buyer who wants a factory-quality replacement for the Infiniti FX35 that restores drivability and avoids dealer-only parts while balancing cost and reliability.
Less Ideal for: Not the best choice for someone seeking a performance-modified or aftermarket-tuned throttle body; enthusiasts wanting non-stock calibration should consider dedicated performance units.
- Factory-quality design and fit intended for Infiniti throttle body replacement
- Sealed electronics and precision TPS circuitry reduce contamination-related drift
- Fast-response electric motor improves throttle responsiveness and idle control
- Machined exterior and OEM-compatible part numbers support long-term durability
- May require ECU relearn or dealer programming to synchronize both throttle units
- Some buyers reported early failures or sensor faults in a minority of units
Verdict A factory-quality replacement that restores FX35 throttle response and idle control, provided you complete the required relearn or programming step.
Choosing the Right Infiniti FX35 Throttle Body: Key Factors to Consider
Fitment and Mounting
Correct mechanical fit is the foundation of a successful throttle body replacement. The flange pattern, bolt hole spacing, and throttle shaft orientation must match the Infiniti FX35 intake to avoid leaks or misalignment.
Improper fit can lead to vacuum leaks, erratic idle, and premature wear on linkage components. Also check that the actuator and connector locations allow the harness to reach without stressing wires. Confirming fitment reduces installation time and prevents issues that could mimic other engine faults.
Electrical and Sensor Compatibility
Modern throttle bodies integrate sensors and actuators that communicate with the engine control module. Ensure the replacement matches the FX35 electrical connector type, pinout, and sensor outputs to avoid error codes or limp-home modes.
Differences in sensor calibration or connector pin assignments can cause inaccurate throttle position readings. Matching electrical compatibility minimizes the need for wiring changes or aftermarket adapters, and it helps preserve vehicle diagnostics and drivability.
Airflow Characteristics
The internal bore shape, butterfly size, and how smoothly the throttle plate moves influence airflow behavior and response. A unit that maintains consistent, linear airflow helps the engine respond predictably to throttle inputs and supports stable idle control.
Variations in airflow can change fueling and idle strategies, which may require additional calibration. Choose a throttle body with well-machined flow paths and consistent plate operation to support steady performance across the RPM range.
Build Quality and Materials
Durability matters because the throttle body is exposed to heat, vibration, and intake contaminants. Look for robust materials, corrosion-resistant finishes, and tight tolerances on moving parts to reduce the chance of sticking or premature failure.
High-quality bearings or bushings, solid mounting flanges, and durable electrical housing contribute to longer service life. Investing in better construction can reduce long-term maintenance and the likelihood of intermittent faults that are hard to diagnose.
Ease of Installation and Serviceability
How straightforward the unit is to install affects both cost and downtime. Consider whether the part uses the stock connector and bolt pattern, and whether any calibration or relearn is required after installation.
Serviceability includes access to replaceable components or straightforward cleaning if deposits build up. Choose units that allow basic maintenance without full disassembly, and verify whether manufacturers provide clear instructions for installation and throttle relearn procedures.
Maintenance and Cleaning Considerations
Throttle bodies can accumulate carbon and oil residues that affect operation over time. Consider how easy the design is to clean and whether routine maintenance can restore function without replacement.
A design that allows safe cleaning of the bore and plate without disturbing sensors or seals will tend to be more forgiving. Also review whether common maintenance tasks require specialized tools or technical procedures to avoid unintended damage during service.
FAQ
What are common symptoms of a failing throttle body on an Infiniti FX35?
Common signs often include rough or fluctuating idle, reduced throttle response, and occasional stalling at low speeds. You may also see the check engine light with codes related to throttle position or airflow. These symptoms can overlap with other systems, so diagnosis should confirm the throttle body is the source before replacement.
Can throttle body cleaning resolve idle surge or hesitation?
Cleaning can often improve issues caused by carbon buildup or oil deposits on the throttle plate and bore. If the symptoms stem from contamination rather than an electrical fault or mechanical wear, a careful cleaning can restore smoother idle and response. However, cleaning will not fix damaged sensors or worn actuators.
Do I need special tools or procedures to replace the throttle body on an Infiniti FX35?
Basic hand tools typically cover removal and installation, but you should be prepared for calibration steps such as throttle relearn or ECU resets that some vehicles require. Work carefully around electrical connectors and intake gaskets to avoid vacuum leaks. If unsure, consult repair documentation for the specific FX35 model year for correct procedures.
How do throttle position issues differ from mechanical throttle body malfunctions?
Throttle position issues usually refer to sensor or electrical faults that report incorrect plate angles to the engine control module. Mechanical malfunctions involve sticking plates, worn shafts, or binding linkages that physically restrict movement. Diagnosis should include both electrical checks and a physical inspection to isolate the cause.
Is a throttle body rebuild kit a good option for the FX35?
A rebuild kit can be a cost-effective choice if the housing and electrical components are sound and the problem is limited to seals, bearings, or minor wear. Kits require mechanical skill and correct parts for the FX35, and they may not address electronic failures. Evaluate condition carefully before deciding between rebuilding and replacing.
How We Chose the Best Infiniti FX35 Throttle Body
We focused on parts specifically suited to the Infiniti FX35 and assessed candidates across multiple technical and practical dimensions. Key evaluation criteria included fitment accuracy to the FX35 intake manifold and throttle linkage, actuator and sensor compatibility with the vehicle electrical system, and measured airflow or bore consistency for predictable throttle response. We also considered construction quality and materials to gauge durability under heat and vibration, plus the ease of installation including connector and mounting match. Finally, we reviewed available guidance for calibration or relearn procedures that may be needed after installation. We excluded any items that did not list direct compatibility with the Infiniti FX35, unknown-condition used units without clear refurbishment details, and parts with unclear electrical pinouts. The final list emphasizes reliability, correct mechanical and electrical fit, and straightforward installation for this specific vehicle application.
Our full evaluation process is outlined in our review methodology.
Conclusion
When choosing a throttle body for an Infiniti FX35, prioritize correct mechanical and electrical fitment first, then weigh airflow characteristics and build quality. Ease of installation and the potential for routine cleaning or rebuilding are practical secondary considerations. Expect tradeoffs between convenience and longevity: a unit that fits exactly and matches sensor outputs reduces installation risk, while higher-quality materials and serviceable design can lower maintenance over time. Focus on the factors that most affect drivability for your typical use.
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