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Choosing the right Infiniti G37 throttle body matters because it directly affects throttle response, idle quality, and overall drivability. A correctly matched unit ensures consistent airflow, reliable electronic control, and fewer driveability hiccups during everyday use. This guide covers seven shortlisted throttle bodies that meet common fitment and performance needs. We evaluated each option for airflow characteristics and electrical compatibility, along with durability and ease of installation, to help you decide which approach fits your goals. Read on to compare the top picks and find the one that best addresses your priorities.
Looking for other parts? See all Infiniti G37 parts & accessories.
Top Picks at a Glance
1. Magorfas Electronic Throttle Body (compatible with Infiniti V6 3.5L)
| Compatible engines | V6 3.5L |
|---|---|
| Connector | 6-pin |
| Replaces part numbers | 16119-8J100, 16119-8J101, 16119-8J103, 16119-8J10A, 16119-8J10B |
| Material | Aluminum |
This Magorfas electronic throttle body replaces the factory unit on Infiniti V6 3.5L models and restores electronic control of the intake volume via its motor-driven throttle plate. It is typically used when the original throttle body shows rough idle, poor throttle response, or a check engine light related to throttle control. Constructed from aluminum, the part is described as heat and corrosion resistant and uses a 6-pin electrical connector to match the vehicle harness. Installation requires throttle body initialization by cycling the key on to allow the unit to self-learn before starting the engine. In practice it offers a straightforward factory-replacement function for owners who need to restore drivability without performance modification. Important limitations are that it must be programmed through the described initialization routine and the unit is an aftermarket replacement, so fit and calibration may require careful installation to match factory behavior. Buyers should verify connector and mounting match their Infiniti before purchase.
Best for: Reliability-focused buyers who prioritize restoring factory-like throttle response on their Infiniti V6 3.5L with a straightforward replacement rather than performance upgrades.
Less Ideal for: Owners seeking performance gains, custom tuning, or a plug-and-play guaranteed fit across multiple vehicle families should consider OEM or performance-specific alternatives.
- Direct replacement fitment for Infiniti V6 3.5L applications listed, addressing common throttle-related drivability issues.
- Aluminum construction resists high temperature and corrosion for long service life.
- Uses a standard 6-pin electrical connector for straightforward wiring compatibility.
- Restores electronic throttle control and improves idle and throttle response when the factory unit fails.
- Aftermarket part may require careful alignment and verification to match factory calibration exactly.
- Requires proper initialization procedure after installation to function correctly.
Verdict A practical, heat-resistant aftermarket throttle body for Infiniti V6 3.5L owners who want a reliability-focused factory-style replacement.
2. IRONTREE Professional Electronic Throttle Body Compatible with Infiniti G35/G37 3.5L (Replacement)
| Brand | IRONTREE |
|---|---|
| Compatible Engine | 3.5L V6 |
| Item model number | TS20058 |
| Manufacturer Part Number | TS20058 |
This IRONTREE electronic throttle body is a direct-replacement unit that restores throttle response and idle control on 3.5L Infiniti engines used in the G37. It arrives pre-assembled with the throttle actuator motor, position sensor and idle control components so installation is plug-and-play with the factory wiring harness and only requires the usual throttle relearn procedure. The manufacturer says components are built to factory-spec tolerances and each unit is computer-tested to ensure consistent operation, which in practice helps resolve symptoms like poor acceleration, unstable idle and P1122-style codes. Buyers report fast fitment and improved drivability after installation, though a minority have received faulty units and needed returns. There is a 3-year warranty offered by the maker and the lower-cost aftermarket option can save money versus dealer replacement, but occasional quality-control variability means having basic diagnostic tools and return options is wise. For a convenience-focused owner wanting a quick, affordable swap to get a G37 back on the road, this is a practical choice.
Best for: Convenience-driven Infiniti G37 owners who want a fast, lower-cost repair that restores daily drivability without complex modification.
Less Ideal for: Drivers seeking a fully OEM-sourced part, performance upgrades, or guaranteed zero-defect replacements should consider dealer parts or higher-end remanufactured units.
- Plug-and-play design with pre-assembled actuator and sensors for straightforward installation
- Built and tested to factory-spec tolerances to provide consistent throttle control
- Direct replacement for the 3.5L Infiniti throttle body to address poor acceleration and idle issues
- Lower-cost aftermarket option that can save money compared with dealer parts
- Some buyers report occasional defective units indicating variable quality control
- Fitment and performance require performing the vehicle throttle relearn procedure after installation
Verdict A budget-friendly, plug-and-play throttle body that reliably restores G37 throttle function for owners who prioritize convenience, with some quality variability to watch for.
3. Hitachi ETB0008 Electronic Throttle Body (ETB0008)
| Material | Aluminum, Plastic |
|---|---|
| Mounting Type | Flange Mount |
| Output Type | Electric |
| Upper Temperature Rating | 250 Degrees Celsius |
| OEM Part Number | 16119-JK20B, 16119-JK20D |
The Hitachi ETB0008 is a direct-fit electronic throttle body built to replace the factory unit on the Infiniti G37 and restore proper throttle response and idle control. It uses a sealed electronics module and refined throttle position sensing to maintain accurate air metering and quick motor-driven throttle actuation, which helps correct limp mode, rough idle, and hesitation caused by a failing unit. Installation follows the factory mounting pattern and typically requires the standard relearn or ECU synchronization procedure after fitting. Notable features include a powerful electric actuator for fast response, precision TPS circuitry for consistent engine mapping, and machined aluminum construction for durability. Some buyers report long-term reliability and OEM-equivalent performance, while others encountered early sensor faults that needed replacement or programming at a dealer. Expect to need a relearn or dealer-level programming in some cases to fully synchronize the part with the vehicle ECU. This unit is a strong choice when you want factory-grade accuracy and drivability back in a G37, but occasional programming or warranty follow-up may be necessary if a defect appears.
Best for: Performance-oriented G37 owners who prioritize factory-quality throttle response and want a replacement that restores precise drivability and throttle feel.
Less Ideal for: Owners who want a plug-and-play part without any post-install programming or those who prefer low-cost aftermarket hacks over a high-quality factory-spec replacement.
- Direct replacement designed for Infiniti G37 for restored factory drivability
- Sealed electronics to reduce contamination and sensor drift
- Precision throttle position sensing for improved idle stability and fuel mapping
- Machined aluminum exterior and robust electric actuator for responsive throttle control
- Some units have reported early sensor/electrical failures requiring replacement or dealer programming
- May require ECU relearn or dealer synchronization after installation for correct operation
Verdict A factory-quality throttle body that brings back precise, responsive throttle behavior to the Infiniti G37, though some installations need relearn or dealer programming.
4. TadaMark Throttle Body Replacement for Infiniti QX56 and compatible Nissan 5.6L engines
| Manufacturer Part Number | 8TBY008-max2 |
|---|---|
| OEM Part Number | 16119-7S000 |
| Connector | 6-pin |
| Compatible Engines | 5.6L V8 (listed Nissan/Infiniti applications) |
This TadaMark throttle body is an aftermarket replacement built to match the factory mounting and electrical connector for select 5.6L V8 Nissan and Infiniti applications. It is typically used to replace a failing or carbon-clogged throttle body or integrated idle air control when symptoms include rough idle, misfires, or poor throttle response. The unit is aluminum alloy and includes the six-pin connector and the same general bore size as the factory part, which simplifies installation for a mechanic or a confident DIYer. Practical benefits include addressing common driveability problems without paying dealer prices and a construction that resists carbon buildup. Important limitations are that the part requires a throttle relearn or reset after installation and that fitment is limited to specified 5.6L engines; it is not a universal upgrade and may need professional installation if you are not experienced with relearn procedures. Expect a cost-effective repair option rather than a performance enhancement.
Best for: Budget-conscious buyers who need an affordable, factory-style replacement to restore throttle control and idle quality without paying dealer-level prices.
Less Ideal for: Shoppers seeking a performance upgrade or a universal throttle-body that fits multiple engine families should look elsewhere; also avoid if you cannot perform or arrange a relearn procedure.
- Direct-fit replacement for specified 5.6L V8 applications which simplifies installation
- Aluminum alloy construction intended to resist carbon buildup and extend service life
- Includes matching electrical connector and mounting pattern for straightforward swap-in
- Lower-cost alternative to dealer or OEM-priced throttle bodies
- Requires throttle relearn or reset after installation
- Fitment is specific to certain 5.6L engines and will not work on unrelated models
Verdict A cost-effective factory-style replacement for failing 5.6L V8 throttle bodies that restores driveability if you can perform the required relearn.
5. DriveFix Left and Right Throttle Bodies for Infiniti G37 and compatible 3.5L/3.7L models
| Brand | DriveFix |
|---|---|
| Model | 16119JK20D |
| Manufacturer Part Number | 16119JK20D |
| Applicable Engines | 3.5L, 3.7L |
These DriveFix throttle bodies are marketed as direct-fit replacements for Infiniti models that use 3.5L and 3.7L engines, including the G37. The set includes left and right throttle bodies intended to replace worn or failed factory units and restore proper throttle control and idle behavior. Buyers report the parts are Hitachi-style factory-quality components that install in place of the originals and restore driveability when the stock units have degraded. Installation is typical for throttle body swaps but some vehicles require a throttle relearn or programming step after installation, and a few owners needed a mechanic to complete the relearn. The product appears painted and ready to mount, and comes as a matched pair which simplifies replacement on V6 engines that use two bodies. Limitations to consider are the potential need for professional programming and the fitment requirement for 3.5L/3.7L engines only, so verifying engine code and connector compatibility before purchase is important. For a conservative buyer wanting a like-for-like replacement, this pair is a practical option that targets common failure points in older G37 throttle systems.
Best for: Risk-averse buyers looking for a conservative, like-for-like factory-style replacement for an aging Infiniti G37 throttle system who prioritize reliability and restoring original driveability.
Less Ideal for: Shoppers seeking a universal upgrade, performance modification, or a part for engines other than the specified 3.5L/3.7L G37 application should look elsewhere.
- Sold as a matched left and right pair for V6 applications so both sides can be replaced together
- Reported to be factory-style Hitachi components that match original fit and function
- Painted finish and ready-to-mount design simplifies installation
- Restores throttle control and idle behavior when original bodies are worn
- Some vehicles require a throttle relearn or dealer-level programming after installation which can add labor cost
- Compatibility is limited to 3.5L and 3.7L engines only, so it is not universal
Verdict A practical, factory-style matched pair of throttle bodies for Infiniti G37 owners who want a conservative, direct-fit replacement to restore throttle response.
6. A-Premium Electronic Throttle Body Compatible with Nissan 2.5L (Replace# 16119-JA00A)
| Material | Aluminum |
|---|---|
| Mounting Type | Flange Mount |
| Output Type | Digital |
| Throttle Body Type | Electronic |
This electronic throttle body replaces a failing factory throttle assembly to restore smooth idle, throttle response, and engine control. It installs in place of the stock unit and is used when symptoms like rough idle, stalling, or throttle-related check-engine lights appear. The unit has an aluminum housing and a digital output throttle position sensor built in, so it should communicate correctly with the engine control system after installation and any required relearn procedures. Buyers will appreciate that it mirrors factory fit and function and is offered at a budget-friendly price compared with dealer parts. Expect a straightforward swap for mechanically similar vehicles and generally improved drivability once the vehicle is relearned. Limitations include possible need for throttle relearn or scanning after fitment and that installation quality and long-term durability can vary compared with higher-end branded replacements.
Best for: Practical optimizers looking to fix throttle-related drivability issues without paying dealer prices and who prefer a cost-conscious, do-it-yourself approach to maintenance.
Less Ideal for: Owners seeking a lifetime high-end OEM replacement or coverage-backed dealer part should consider factory-brand options instead.
- Factory-style replacement design for straightforward direct swap
- Integrated throttle position sensor for proper electronic feedback
- Aluminum housing for corrosion resistance compared with plastics
- Positive user reports of easy fit and restored drivability on similar 2.5L Nissan platforms
- May require throttle relearn or ECU reset after installation
- Quality and longevity can vary versus higher-priced OEM-brand units
Verdict A budget-friendly, factory-style electronic throttle body that restores throttle function for practical owners willing to perform or arrange a standard relearn and accept aftermarket durability variability.
7. Dorman 977-563 Electronic Throttle Body Assembly (replacement for select Infiniti/Nissan)
| Operation Mode | Electronic |
|---|---|
| Vehicle Service Type | Passenger Car |
| Compatible Devices | Infiniti G35 (2003-2007) |
This Dorman throttle body replaces the factory unit with a complete, newly manufactured assembly intended to restore throttle control and idle behavior. It installs in place of the original part and includes a new throttle position sensor so you do not need to source extra components. Key engineering changes include a non-contact Hall effect position sensor to avoid wear-related signal faults and an integrated Sensor Shield shaft seal that helps keep oil and contaminants out of the electronics. Dorman says each unit is cycle-tested for durability and comes machined and tested for fitment. In practice that means easier long-term reliability compared with older, wear-prone units and fewer return visits for the same failure. A few users report they had to follow specific throttle relearn or troubleshooting steps after installation, and one reviewer found idle roughness on their vehicle until additional injector or relearn steps were taken, so expect to allow time for calibration after swap-in. This is a practical, value-oriented replacement that aims to match factory function while addressing known weak points.
Best for: Balanced buyers looking for a durable, ready-to-install replacement that fixes common failure points without buying a factory part, and who value long-term reliability over brand-new OEM provenance.
Less Ideal for: Drivers who require guaranteed factory-spec parts for concours restoration or who prefer to avoid any post-install calibration work should consider a factory-quality replacement instead.
- 100% new complete assembly replaces the entire throttle body and position sensor for a full repair
- Non-contact Hall effect sensor reduces mechanical wear on the position sensing system
- Integrated Sensor Shield shaft seal helps prevent oil and contaminant intrusion into electronics
- Extensively cycle-tested to simulate long-term durability
- May require throttle relearn or specific troubleshooting steps after installation to settle idle and throttle response
- Not strictly OEM spec for every vehicle so a small number of vehicles may need extra calibration work
Verdict A robust, fully new replacement throttle body that addresses common failure modes and offers a practical, long-lasting alternative to the original unit.
Choosing the Right Infiniti G37 Throttle Body: Key Factors to Consider
Mechanical Fitment and Mounting
Correct mechanical fitment is essential because the throttle body must seal properly to the intake manifold to maintain consistent vacuum and airflow. Mismatched bolt patterns or flange shapes can cause air leaks that affect idle quality and fuel trims.
Consider whether the unit uses the same gasket interface and mounting hardware as the factory part. Some aftermarket options require adapter plates or altered throttle cables, which can complicate installation and introduce additional failure points. Prioritizing a unit that matches original mounting geometry minimizes troubleshooting and ensures predictable performance.
Electrical Compatibility and Sensor Integration
Modern throttle bodies rely on electronic throttle control and integrated sensors to communicate with the vehicle computer. Electrical compatibility includes matching connector types, sensor signal ranges, and throttle position sensor calibration.
If the replacement has different wiring or sensor characteristics, the ECU may register faults or require relearning procedures. Choosing a unit with identical electrical interfaces reduces the risk of error codes and maintains smooth interaction between the throttle body and engine management system.
Airflow Characteristics and Throttle Response
Airflow capacity and how the throttle blade opens influence throttle response, torque delivery, and engine breathing. A unit with improved flow can make the engine feel more responsive, particularly at higher RPMs, but it should still preserve low-speed drivability.
Assess how the throttle plate profile and bore size affect airflow velocity and turbulence. Changes in airflow characteristics can alter throttle mapping needs, so select a throttle body that balances increased flow with controllable response to avoid abrupt throttle behavior.
Resistance to Carbon Buildup and Maintenance Needs
Carbon deposits commonly accumulate on throttle blades and bore surfaces, which can lead to sticking, erratic idle, and reduced airflow over time. Materials and coatings that resist deposits will maintain performance longer and reduce the need for frequent cleaning.
Consider how accessible the unit is for routine maintenance and whether it accepts standard cleaning procedures. Designs that simplify cleaning or allow partial disassembly can reduce labor and extend service intervals, keeping throttle performance consistent with less effort.
Durability and Quality of Components
Long-term reliability depends on component quality, including the throttle shaft, bearings, motor, and sensors. Durable materials and robust motor assemblies minimize wear and the likelihood of mechanical failure or excessive play in the throttle shaft.
Look for units with corrosion-resistant finishes and solid electrical connections. Better-quality components often translate to fewer return repairs and more predictable performance under varied driving conditions.
Serviceability and Parts Availability
Serviceability covers how easy it is to repair or rebuild the throttle body when wear occurs. Readily available replacement parts, such as gaskets, motors, or rebuild kits, make it simpler and less costly to restore function without replacing the entire assembly.
Consider whether the design allows for replacing individual components and whether common service items are standard sizes. A unit that supports rebuilds or has widely available parts can reduce long-term ownership costs and downtime.
FAQ
What symptoms indicate my Infiniti G37 throttle body might be failing?
Common signs include rough or fluctuating idle, reduced throttle response, and occasional stalling, especially when coming to a stop. You may also see the check engine light or experience inconsistent acceleration. These symptoms often start intermittently and can worsen over time.
Can throttle body cleaning fix poor idle or surging?
Cleaning can often restore normal idle if carbon buildup is restricting the throttle plate or bore. It usually helps when symptoms are caused by deposits rather than electrical faults. Persistent issues after cleaning may indicate sensor or motor problems that require replacement.
How do I know if I need a throttle body replacement versus a rebuild?
If the problem stems from worn bearings, a failing motor, or damaged sensors, a rebuild or component replacement may be sufficient. Replacement is preferable when the housing is damaged, wiring is compromised, or parts are unavailable. Availability of rebuild kits and service parts will influence the decision.
Will replacing the throttle body require ECU relearn or calibration?
Many vehicles benefit from an idle or throttle relearn after installation to ensure smooth operation and correct sensor baselines. Some systems perform automatic relearning during a drive cycle, while others may need a specific procedure. Follow manufacturer-recommended steps for best results.
Are there common maintenance steps to extend throttle body life?
Regular inspection and periodic cleaning to remove carbon deposits can prolong service life and maintain consistent throttle response. Ensuring vacuum lines and intake components are in good condition reduces the rate of contamination. Prompt attention to minor symptoms prevents larger failures.
How We Chose the Best Infiniti G37 Throttle Body
We evaluated throttle bodies based on criteria that matter for Infiniti G37 owners. Primary filters included mechanical fitment to the G37 throttle housing and electrical connector compatibility to avoid ECU errors. We measured airflow performance and throttle aperture responsiveness as indicators of real-world throttle feel. Durability and materials were assessed to gauge long-term reliability, including resistance to carbon buildup and wear. Ease of installation and serviceability were considered to reduce labor time, along with available replacement parts or rebuild options. Units that required engine modifications, custom wiring, or extensive calibration were excluded to keep choices practical for most owners. We also excluded products lacking verifiable quality or clear fitment information. The resulting list prioritizes correct fit, predictable airflow behavior, robust construction, and straightforward installation.
Our full evaluation process is outlined in our review methodology.
Conclusion
Focus on fitment and electrical compatibility first, since those factors determine whether a throttle body will function reliably with an Infiniti G37 without additional modification. Balance airflow goals with the need for smooth low-speed operation to avoid creating new driveability issues. Prioritize units that offer robust construction and easy access for cleaning or rebuilding, and be realistic about tradeoffs between increased airflow and throttle control. Using the evaluation criteria above will help you choose a throttle body that matches your driving priorities and maintenance preferences.
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