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If your Infiniti G37 is showing rough idle, reduced fuel economy, or a persistent engine light, swapping the oxygen sensor can address those issues. Picking the right Infiniti G37 oxygen sensor matters because fitment, correct wiring, and stable signal output affect drivability and emissions. This guide covers seven shortlisted options that meet common fit and electrical standards for the G37 and explains the criteria used to evaluate them. Use the quick notes below to find sensors that focus on fitment, wiring type, and long-term signal stability before you decide.
Looking for other parts? See all Infiniti G37 parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | AUTO OCCASION Upstream Oxygen Sensor 234-9036 |  |
| Most Popular A crowd favorite that many people choose with confidence | DOSKJOK Downstream Heated Oxygen Sensor 234-4380 (pair) |  |
| Best Quality Built to a higher standard if you want something more solid | BLPextrm Upstream Oxygen Sensor for Infiniti G37 (2008) |  |
| Best Budget The cheapest option that still gets the job done reliably | HMJXF Heated Upstream Oxygen Sensor 234-4380 Compatible with Infiniti G37 |  |
| Most Sold A high-volume bestseller chosen again and again | Sangyue Oxygen O2 Sensor Kit (4-pack) for 2008 Infiniti G35/ G37 and Compatible 3.5L–3.7L Engines |  |
| Best Value for Money The sweet spot between price and what you get | YHTAUTO Upstream Oxygen Sensor for Infiniti G37 / Nissan Murano (4-Wire) |  |
| Best Overall The best all-around choice for most situations | MAXFAVOR Oxygen Sensor 2-Pack (Fits Nissan/Infiniti 3.5L–4.0L) |  |
1. AUTO OCCASION Upstream Oxygen Sensor 234-9036
| Material | Ceramic |
|---|---|
| Mounting Type | Flange Mount |
| Output Type | electrical signal |
| Measuring Range | 0-25% O2 |
This AUTO OCCASION upstream oxygen sensor is a plug-in replacement designed to restore correct air-fuel ratio feedback on compatible Infiniti vehicles. Installed in the upstream position, it measures oxygen content before the catalytic converter and sends an electrical signal to the engine control module so the ECU can adjust fuel trim. Typical use is replacing a failed factory sensor to clear lean/rich codes and recover proper idle and fuel economy. The sensor includes a flange-mount fitting and is marketed with ceramic sensing element and claimed measurement accuracy. Buyers report straightforward fit and that installing it resolved check-engine light codes. Limitations to consider are that aftermarket sensors vary in long-term durability compared with factory-quality parts and installation can be tight or require penetrating seized hardware on older cars. Also confirm upstream versus downstream location before ordering since the wrong position will not correct the problem.
Best for: Reliability-focused owners who prioritize getting a dependable, straightforward replacement part to clear emissions or fuel-trim faults and return normal drivability to their Infiniti G37.
Less Ideal for: Drivers who prefer dealer-sourced factory-quality parts or those who plan to upgrade to high-performance tuning sensors should consider other options.
- Direct-fit design for listed Infiniti/Nissan applications for simple replacement
- Upstream placement provides the ECU with pre‑cat air-fuel ratio data to correct fuel trims
- Comes packaged and protected for shipping to reduce risk of transit damage
- Ceramic sensing element and claimed accuracy indicate it is built for standard O2 measurement tasks
- Aftermarket longevity can be shorter than factory-quality sensors under heavy use
- Fitment must be double-checked for upstream versus downstream location to avoid ordering the wrong sensor
Verdict A practical upstream replacement that restores proper air-fuel feedback on compatible Infiniti G37 models, with typical aftermarket durability and the need to confirm correct sensor location.
2. DOSKJOK Downstream Heated Oxygen Sensor 234-4380 (pair)
| Position | Downstream |
|---|---|
| Wire Quantity | 4 wire |
| Sensor Type | Heated |
| Manufacturer | DOSKJOK |
| Upper Temperature Rating | 1562 Degrees Fahrenheit |
This DOSKJOK downstream oxygen sensor is a direct-fit replacement sold as two pieces and designed to restore proper exhaust oxygen sensing on compatible Infiniti G37 models. It installs in the downstream position and uses a heated four-wire design with a factory-style plug for a plug-and-play swap. In practical use it helps the engine management maintain correct air/fuel balance, which can improve idle stability, reduce emissions, and help fuel economy after a failed sensor is replaced. The listing notes pre-coated threads to ease installation and claims high temperature and oxidation resistance for durability. Real-world feedback is mixed: several buyers report straightforward fitment on G37s and quick resolution of fault codes, while others experienced wrong parts or failures on arrival, so confirm connector and part numbers before ordering. This unit is a budget-friendly replacement option for owners who want a quick, convenient DIY fix, but results depend on correct fitment and quality control from the supplier.
Best for: Convenience-driven owners who prioritize an easy, direct-replacement fix for a G37 and want a cost-effective part they can install themselves to clear O2 sensor fault codes quickly.
Less Ideal for: Owners seeking a guaranteed OEM-equivalent or professional shops that require certified parts and traceable supply should consider branded factory-quality alternatives instead.
- Sold as a two-piece set for replacing both downstream sensors when applicable
- Heated four-wire design with factory-style connector for plug-and-play installation
- Pre-coated threads simplify installation and reduce the risk of seizing
- Intended to restore proper air/fuel feedback to improve idle stability and emissions
- Quality control appears inconsistent based on mixed customer reports
- Some buyers received incorrect or used parts which required returns
- Not all listings fitment claims were accurate so verification is necessary before purchase
Verdict A convenient, affordable plug-and-play downstream sensor option for Infiniti G37 owners, but confirm fitment and accept some variability in part quality.
3. BLPextrm Upstream Oxygen Sensor for Infiniti G37 (2008)
| Application | Upstream oxygen sensor for Infiniti G37 2008 3.7L |
|---|---|
| Manufacturer | BLPextrm |
| Max operating temperature | Up to 650 degrees Celsius |
| Replacement part numbers | 2349037, 22693-EY00A, 211200-7120 |
This upstream oxygen sensor from BLPextrm is a direct-fit replacement intended for the 2008 Infiniti G37 3.7L. It installs in the upstream position to monitor exhaust oxygen content and feed that data to the engine control module so fuel trim and ignition timing can be corrected. The listing highlights a fast response element rated to withstand high exhaust temperatures, which in practice helps the ECU reach stable closed-loop operation sooner and can clear drivability issues like rough idle or a check engine light tied to O2 performance. Typical use is a one-to-two hour DIY swap or a quick shop job using an oxygen-sensor socket. Limitations are that this is an aftermarket unit rather than a factory-branded sensor and buyers should verify the part number match before ordering; longevity can vary depending on driving conditions. For a performance-focused G37 owner it offers a simple way to recover engine responsiveness and fuel control without major engine work.
Best for: Performance-oriented owners focused on restoring precise air/fuel control and throttle response in their 2008 Infiniti G37 who prefer a hands-on repair or quick shop replacement.
Less Ideal for: Owners seeking a factory-branded or dealer-supplied sensor for guaranteed OEM traceability or those unwilling to verify part number fitment before purchase.
- Direct-fit upstream replacement for the 2008 Infiniti G37 3.7L, simplifying installation
- Fast-response sensing element designed for high exhaust temperatures to improve closed-loop control
- Multiple customer reports of resolving check-engine light and restoring smooth idle and fuel economy
- Aftermarket unit not sold as a factory-branded sensor so exact long-term durability may vary
- Fitment requires confirming part number match; wrong choice can cause incompatibility
Verdict A performance-minded, direct-fit aftermarket upstream O2 sensor for the 2008 Infiniti G37 that restores proper fuel control and drivability when the factory sensor has failed.
4. HMJXF Heated Upstream Oxygen Sensor 234-4380 Compatible with Infiniti G37
| Sensor location | Upstream |
|---|---|
| Sensor type | Heated |
| OEM equivalent part numbers | 234-4380, 22690-EN200, 226A0-JA10C |
| Package contents | 1 x Oxygen Sensor |
This HMJXF heated upstream oxygen sensor is a direct-replacement style unit sold as a low-cost option for Infiniti G37 owners who need to restore proper O2 feedback. It installs in the upstream position between the engine and catalytic converter and uses a heated element so it reaches operating temperature quickly for accurate air-fuel ratio readings. The listing notes compatibility with vehicles that use part number 234-4380 and claims factory-quality testing and materials to improve fuel economy and emissions when the original sensor fails. In practice this sensor is useful for clearing emissions-related check-engine lights and returning stable idle and fuel trim behavior without the premium price of a dealer part. Limitations are typical of budget aftermarket sensors: long-term durability versus a factory replacement can vary and full compatibility depends on matching the exact part number and connector used on the G37. Buyers should verify fitment for their model year and engine before installation.
Best for: Budget-conscious Infiniti G37 owners who prioritize a low-cost fix for emissions or check-engine codes and want a plug-in replacement that restores normal fuel trim and idle behavior.
Less Ideal for: Owners seeking a long-term OEM-level replacement or those who prefer dealer parts with established longevity and warranty support should consider factory replacements instead.
- Direct-replacement upstream heated sensor designed for part number 234-4380 applications
- Heated element allows quicker warm-up and more accurate early-running readings
- Marketed as factory-tested and ready to install for immediate use
- Aftermarket durability and long-term lifespan may be less predictable than a factory replacement
- Fitment depends on exact part number and connector so incorrect selection will require returns or modifications
Verdict A cost-effective upstream heated O2 sensor for Infiniti G37 when you need a quick, affordable replacement but expect possible variation in long-term durability.
5. Sangyue Oxygen O2 Sensor Kit (4-pack) for 2008 Infiniti G35/ G37 and Compatible 3.5L–3.7L Engines
| Brand | Sangyue |
|---|---|
| Material | Aluminum Oxide, Stainless Steel |
| Output Type | Electrical signal |
| Upper Temperature Rating | 800 Degrees Fahrenheit |
This Sangyue four-pack supplies two upstream (air-fuel ratio) and two downstream oxygen sensors designed as direct replacements for the specified Infiniti/Nissan 3.5L–3.7L engines. In typical use the sensors plug into the factory harness and thread into the exhaust to monitor oxygen levels and feed the engine control unit for fuel-trim adjustments. The listing highlights a production line built to mirror factory sensors and an 800°F upper temperature rating, which suggests normal durability for exhaust conditions, and the included installation guidance is helpful for DIYers. Practical benefits include replacing all four sensors at once to clear codes and restore fuel economy and emissions performance. Limitations are that this is an aftermarket option rather than a factory supplier part so fitment and long-term durability may vary, and one occasional failure report in user feedback indicates not every sensor is guaranteed to match OEM longevity. Expect straightforward fit-and-forget performance for routine repairs but be prepared to diagnose if a single sensor underperforms.
Best for: Practical, risk-averse buyers who want a single purchase to replace all O2 sensors and restore drivability without shopping for individual parts. Ideal for mainstream owners who prefer a straightforward repair that minimizes follow-up parts hunting.
Less Ideal for: Buyers seeking guaranteed factory-supplier parts or extended OEM-backed durability should consider factory-quality replacements or dealer options instead.
- Complete 4-piece set replaces both upstream and downstream sensors for a full repair in one purchase
- Engineered production process claims to replicate factory sensor design for plug-in fitment
- 800°F upper temperature rating appropriate for typical exhaust conditions
- Includes installation guidance useful for DIY replacement and troubleshooting
- Aftermarket part rather than factory-authorized supplier so long-term durability can vary
- Some customers reported individual sensor failures which may require exchange or replacement
Verdict A convenient, full four-sensor aftermarket kit that lets mainstream owners replace all O2 sensors at once, but it is not a factory-authorized part and results may vary.
6. YHTAUTO Upstream Oxygen Sensor for Infiniti G37 / Nissan Murano (4-Wire)
| Application | Infiniti G37 2008 V6 3.7L; Nissan Murano 2009-2010 V6 3.5L |
|---|---|
| Wiring | 4-Wire (heated) |
| Mounting Type | Threaded Mount |
| Maximum Supply Voltage | 5.5 Volts |
| Material | Stainless Steel |
This YHTAUTO upstream oxygen sensor is a direct-fit replacement for the Infiniti G37 2008 3.7L and Nissan Murano 2009–2010 3.5L applications listed, marketed as a quicker-response air/fuel ratio sensor with a threaded mount and pre-coated threads for easier installation. It is typically used to replace a failed bank 1 or bank 2 upstream sensor to restore proper fuel trim, reduce emissions, and prevent catalytic converter damage. The sensor is a 4-wire type with push-pull output and a maximum supply voltage of 5.5 volts, so it supports heated-sensor circuits common on these V6 engines. Buyers will appreciate the straightforward fitment, stainless steel construction, and the one-year guarantee. Limitations include inconsistent longevity reported by some users and occasional fitment variation for vehicles with California emissions or different factory shields, so verifying plug and physical protector presence is important before installation. This unit is a budget-focused alternative to factory sensors that can restore drivability and pass emissions if the match is correct, but it may not match OEM longevity in all cases.
Best for: Practical optimizers who want a low-cost, functional replacement to get an Infiniti G37 back to normal operation without paying for an expensive factory sensor, prioritizing immediate value and repairability.
Less Ideal for: Buyers seeking the longest-lasting, factory-identical sensor or those who require guaranteed California emissions fitment should consider OEM or emission-specific alternatives.
- Direct-fit design for the listed Infiniti G37 and Nissan Murano upstream positions to simplify replacement.
- Stainless steel build and threaded mount with pre-coated threads for easier installation.
- 4-wire heated sensor compatible with factory heated circuits for faster warm-up and accurate readings.
- Designed to improve fuel economy and reduce harmful emissions when functioning correctly.
- Reported variability in lifespan compared with factory sensors, with some users seeing early heater failure.
- May lack protective shielding present on some factory upstream sensors, which can affect durability in certain locations.
Verdict A budget-minded direct-fit upstream oxygen sensor that restores function and emissions compliance for the listed G37/Murano models but may not match OEM longevity in all cases.
7. MAXFAVOR Oxygen Sensor 2-Pack (Fits Nissan/Infiniti 3.5L–4.0L)
| Material | Stainless Steel |
|---|---|
| Output Type | Digital |
| Mounting Type | Flange Mount |
| Upper Temperature Rating | 1200 Degrees Fahrenheit |
| Specific Uses For Product | Oxygen Sensor |
This MAXFAVOR two-pack supplies upstream oxygen sensors intended as direct replacements for compatible Nissan and Infiniti V6 engines. Installed in the exhaust stream, the sensors measure oxygen content to help the engine control module tune fuel mixture and clear related diagnostic codes. The kit includes flange-mount, digital-output sensors with stainless steel housings and a high temperature rating, and the listing notes step-by-step installation guidance. In practice these sensors will restore closed-loop fueling and can return fuel economy and idle quality when a failing sensor is the cause. Buyers should note mixed user reports on reliability—some customers report long trouble-free service while others experienced early failures and needed a replacement or partial refund. Fitment checks and comparing the connector and thread to the factory unit before installation are important to avoid returns. The one-year coverage may help in case of an early failure, but occasional variability in longevity means proactive testing after install is advised.
Best for: Balanced all-round buyers who want an affordable, factory-style replacement to restore proper fuel trim and clear OBD-II codes on qualifying Infiniti G37 models.
Less Ideal for: Do not choose this if you need guaranteed long-term durability for a high-mileage vehicle without accepting some risk of early failure or if you prefer parts with an established OEM brand warranty.
- Sold as a two-pack so you can replace both upstream sensors at once
- Stainless steel construction and 1200°F upper temperature rating for exhaust conditions
- Digital output and flange-mount design match factory-style installation steps
- User reports show inconsistent reliability with some units failing shortly after installation
- Not vehicle-specific packaging or labeling can lead to fitment confusion if not double-checked
Verdict A practical two-pack factory-style replacement that can fix fueling and check-engine issues on compatible Infiniti G37s but has mixed reliability reports so expect to verify fit and function after installation.
Choosing the Right Infiniti G37 Oxygen Sensor: Key Factors to Consider
Physical Fit and Threading
An oxygen sensor must match the G37 exhaust bung size, thread pitch, and mounting depth. Incorrect threading can cause exhaust leaks or cross-threading, which lead to installation difficulty and potential exhaust system damage.
Matching the sensor body length and hex size matters when access is limited under the vehicle. Too-long or too-short sensors can interfere with heat shields or miss the correct sampling position, altering signal readings and causing drivability symptoms.
Connector Type and Wiring Length
The sensor connector must mate with the vehicle wiring harness without splicing or stretching. Wrong connector types or insufficient lead length can create poor electrical contacts or stress at the plug, which sometimes causes intermittent faults and check engine lights.
Adequate wire length and proper strain relief let you route the harness away from heat sources and moving parts. Consider whether the replacement includes protective sheathing or terminal seals to resist heat and vibration over time.
Heater Circuit Reliability
Most oxygen sensors rely on an internal heater to reach operating temperature quickly so the engine can run in closed-loop mode. A reliable heater circuit shortens warm-up time and reduces cold-start emissions and drivability issues.
Look for sensors with documented heater resistance ranges and robust heater elements. Faulty or slow heaters often trigger diagnostic codes and can mask true air-fuel issues during drive-cycle verification.
Signal Response and Stability
Response speed and stability of the sensor output determine how well the engine management system can trim fuel delivery. A sensor that reacts sluggishly or produces noisy signals may cause poor fuel control, rough running, or higher emissions.
Consider sensors specified for quick voltage or current changes and minimal drift. Consistent signal behavior across temperature and load conditions helps maintain predictable engine performance and easier diagnostics.
Durability and Environmental Resistance
Oxygen sensors operate in corrosive, high-temperature exhaust environments. Materials and coatings that resist contamination from oil, coolant, and road debris prolong service life and reduce failure risk.
Look for features like reinforced sheathing, ceramic element protection, and anti-seize on threads where appropriate. Durability matters especially if the vehicle sees frequent short trips, salty roads, or towing, all of which accelerate sensor wear.
Compatibility With Diagnostic Expectations
Replacement sensors should produce the type of signal the Infiniti G37 engine control module expects, whether narrowband voltage swings or wideband current output. Mismatched signal types or out-of-spec outputs can cause false codes or improper fuel trims.
Confirm that the sensor matches the intended position and function in the exhaust stream, such as upstream heater-equipped sensors that monitor pre-catalyst combustion and downstream sensors that monitor catalyst efficiency. Proper signal compatibility simplifies diagnosis and prevents unnecessary parts swapping.
FAQ
What symptoms point to a failing oxygen sensor on an Infiniti G37?
Common signs include a persistent check engine light, rough idle, reduced fuel economy, and occasional engine hesitation. You may also notice higher emissions during inspections. These symptoms often show up gradually and can overlap with other issues, so diagnostic trouble codes and signal testing help confirm a failing sensor.
Can I replace an Infiniti G37 oxygen sensor myself?
Many owners can perform the replacement with basic hand tools and a proper oxygen sensor socket, provided they have safe access to the sensor location. Ensure the engine and exhaust are cool, and verify connector fit and wire routing before final torque. If you are unsure about electrical connections or diagnostic steps, consider professional assistance.
How do upstream and downstream sensors differ on the G37?
Upstream sensors monitor the air-fuel mixture right after the engine and help the ECU adjust fueling, while downstream sensors measure exhaust after the catalytic converter to gauge its efficiency. Each position has different functional requirements, such as heater operation and response time, so replacements should match the intended position.
Will a bad heater circuit trigger a trouble code?
Yes. A failed or high-resistance heater circuit commonly sets specific diagnostic codes related to the oxygen sensor heater. Such a fault can prevent the sensor from reaching operating temperature quickly, leading to longer open-loop operation, higher emissions, and further codes related to fuel trims.
How can I test an oxygen sensor before replacing it?
You can perform a basic check by monitoring the sensor signal with a scan tool or multimeter while the engine reaches operating temperature. Look for rapid voltage switching on narrowband sensors or expected current/voltage ranges on wideband units. Also check heater resistance and wiring continuity. These checks help differentiate sensor faults from wiring or exhaust leaks.
Does the sensor location matter when buying a replacement?
Yes. Sensors located before the catalytic converter typically require faster response and a working heater, while downstream positions are focused on catalyst monitoring and may have different mounting depths. Buying a sensor specified for the exact G37 location avoids compatibility and diagnostic issues.
How We Chose the Best Infiniti G37 Oxygen Sensor
We focused on parts that specifically match the Infiniti G37 chassis and engine layouts to ensure correct plug type, mounting thread, and wiring lengths. Evaluation criteria included mechanical fit and thread pitch, connector compatibility and wire length, sensor response time and signal stability under varying loads, durability features such as protective sheathing and anti-seize where applicable, and electrical resistance and heater circuit reliability for timely closed-loop operation. We prioritized sensors that meet common OE electrical and physical specifications and that are designed to handle typical exhaust temperatures and contaminants found in the G37. Exclusions: generic or universal sensors without documented fitment for the Infiniti G37 and products lacking clear electrical specifications were not considered. The final selection emphasizes correct fit, dependable heater operation, and predictable voltage or current behavior during testing conditions.
Our full evaluation process is outlined in our review methodology.
Conclusion
When choosing an oxygen sensor for an Infiniti G37, prioritize correct physical fit, connector compatibility, and a dependable heater circuit. Signal response and durability under exhaust conditions are the next most important factors. Balancing these criteria helps ensure predictable ecu behavior, fewer diagnostic headaches, and longer service intervals. Focus on matching the sensor to the G37 position and confirming electrical specs before installation.
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