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If your Acura TLX is showing lower fuel economy, rough idle, or a stubborn check engine light, the oxygen sensor is a common culprit. Choosing the right Acura TLX oxygen sensor matters because the sensor affects fuel trim, emissions, and engine drivability. This guide covers seven shortlisted options that fit the TLX and explains the practical tradeoffs buyers face.We evaluated each choice for fitment accuracy and signal response among other factors, and the following sections explain what we looked for and why those details matter. Read on to find the best fit for your needs and intended use.
Looking for other parts? See all Acura TLX parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | AXINMOTOO Replacement Heated Oxygen Sensor Kit (Upstream & Downstream) for Acura TLX 2.4L |  |
| Most Popular A crowd favorite that many people choose with confidence | higherbro 2‑Piece Oxygen O2 Sensor Kit (Upstream + Downstream) for Acura TLX 2.4L |  |
| Best Quality Built to a higher standard if you want something more solid | Bosch 18050 Premium Fitment Oxygen Sensor |  |
| Best Budget The cheapest option that still gets the job done reliably | GRIZZLY AUTO Upstream Oxygen Sensor for Acura TLX 2.4L |  |
| Most Sold A high-volume bestseller chosen again and again | LHWV 2-Pack Upstream Air Fuel Ratio Oxygen Sensor (250-25059) |  |
| Best Value for Money The sweet spot between price and what you get | AUTO OCCASION Oxygen Sensor 2-Pack (Fits Acura TLX 2.4L L4) |  |
| Best Overall The best all-around choice for most situations | A-Premium 2‑Piece Downstream Oxygen Sensor Kit |  |
1. AXINMOTOO Replacement Heated Oxygen Sensor Kit (Upstream & Downstream) for Acura TLX 2.4L
| Application | Acura TLX L4 2.4L 2015-2020 |
|---|---|
| Sensor Type | Heated |
| Placement on Vehicle | Upstream and Downstream |
| Mounting Type | Threaded |
This AXINMOTOO kit supplies both the upstream and downstream heated oxygen sensors used to restore the TLX 2.4L engine's air/fuel feedback loop. Installation is typical threaded, plug-and-play replacement using the factory-style connectors and harness lengths listed, so it is commonly used when diagnostic codes point to failing O2 sensors or when restoring closed-loop fuel control. The sensors are marketed as meeting factory-spec sensing and deliver fast, stable voltage responses to changes in exhaust oxygen concentration, which helps the engine control module re-establish proper fuel trims and can improve fuel economy. Practical benefits include replacing both sensors at once to avoid repeated labor and returning drivability lost to delayed throttle response. Limitations are that longevity depends on vehicle conditions and the seller recommends periodic replacement every 50,000–60,000 miles, and buyers should verify fitment for the exact TLX submodel before installing.
Best for: Reliability-focused buyers who prioritize restoring factory-like engine control and consistent drivability on an Acura TLX 2.4L, and who prefer replacing both sensors at once to avoid repeat repairs.
Less Ideal for: Users seeking a lifetime or heavy-duty racing solution or those who want a sensor that is guaranteed for extended mileage under extreme conditions should consider purpose-built performance or OEM dealer options.
- Includes both upstream and downstream heated sensors for a complete replacement of the TLX 2.4L oxygen sensing system
- Factory-style threaded mounting and matching connectors for straightforward, plug-in installation
- Designed to deliver quick, stable sensor output so the engine control module can regain correct fuel trims
- Replacing both sensors together reduces repeat labor and helps restore drivability and throttle response
- Service life depends on exhaust conditions so it may require periodic replacement around the recommended interval
- No vehicle-specific warranty or long-term durability data provided in the listing
Verdict A cost-effective two-sensor kit that restores factory-style oxygen sensing and drivability on the Acura TLX 2.4L when reliability and straightforward installation are the main priorities.
2. higherbro 2‑Piece Oxygen O2 Sensor Kit (Upstream + Downstream) for Acura TLX 2.4L
| Brand | higherbro |
|---|---|
| Material | Stainless Steel And Ceramic |
| Mounting Type | Flange Mount |
| Output Type | analog electrical signal |
| Upper Temperature Rating | 250 Degrees Fahrenheit |
This higherbro kit includes both the upstream and downstream oxygen sensors designed for the Acura TLX 2.4L and installs in place of factory sensors to restore proper exhaust oxygen feedback. In typical use the upstream sensor measures exhaust oxygen before the catalytic converter to help the engine control unit adjust fuel trim, while the downstream sensor monitors converter efficiency. The sensors use a stainless steel and ceramic construction and come as a matched pair so you replace both sensors at once, which helps avoid uneven readings from a new sensor paired with an old one. Installation is the same as other flange‑mounted sensors and is straightforward for a home mechanic with basic tools and an O2 sensor socket. Limitations include a modest listed temperature rating and no detailed compatibility beyond the TLX 2.4L note, so confirm year and engine fitment before buying. The kit is a practical, convenience-focused option when you want a matched upstream/downstream replacement without sourcing parts separately.
Best for: Buyers who prioritize convenience and want a ready pair replacement for their Acura TLX 2.4L to quickly restore proper emissions feedback and fuel trim without sourcing individual sensors.
Less Ideal for: Drivers seeking a sensor with a higher temperature rating or an exact OEM part number for warranty‑level replacement should consider alternative factory‑quality options.
- Provides both upstream and downstream sensors so both sides of the exhaust system are serviced at once
- Stainless steel and ceramic construction typical for oxygen sensors intended to handle exhaust conditions
- Sold as a matched pair which reduces the risk of mismatched sensor readings after replacement
- Product listing gives limited specific year‑by‑year fitment details so you must verify exact compatibility
- Upper temperature rating listed is relatively low compared with some high‑temperature sensor specifications
Verdict A convenient matched upstream/downstream sensor kit for the Acura TLX 2.4L that simplifies replacement, provided you confirm exact year and engine fitment.
3. Bosch 18050 Premium Fitment Oxygen Sensor
| Brand | Bosch |
|---|---|
| Material | Stainless Steel |
| Mounting Type | Flange Mount |
| Output Type | electrical signal |
This Bosch 18050 oxygen sensor is a direct-fit replacement that restores proper air-fuel ratio feedback to the engine control system. It installs where the factory sensor goes and is typically used to clear engine codes, improve fuel economy, and reduce emissions when an original sensor has degraded. Notable features include a double laser-welded stainless steel body for corrosion resistance, a fast-acting heater that brings the sensor up to operating temperature quickly, and factory-style electrical connector and pre-coated threads to simplify installation. In real-world use those elements mean reliable starting of closed-loop operation shortly after startup, lower chances of early failure from exhaust exposure, and fewer installation hassles for DIYers or shops. Limitations: fitment depends on engine and position so confirm the TLX sensor location before ordering, and a few users report occasional quality-control issues with the gasket or seal that may require attention during installation.
Best for: Performance-oriented buyers who prioritize restoring precise engine control and emissions response quickly and prefer a high-quality replacement that behaves like the factory sensor.
Less Ideal for: Buyers seeking a universal or adjustable sensor for custom exhaust setups should consider a dedicated aftermarket performance sensor instead.
- Direct-fit design with factory-style connector for straightforward installation
- Double laser-welded stainless steel body for improved corrosion and exhaust resistance
- Fast-acting heater reduces warm-up time so the ECU reaches closed-loop operation sooner
- Threads pre-coated with anti-seize to prevent galling during installation
- Some reported quality-control failures on the gasket or seal in a minority of units
Verdict A near-OEM direct-fit sensor that brings fast warm-up and robust stainless construction for TLX owners seeking reliable, performance-focused replacements.
4. GRIZZLY AUTO Upstream Oxygen Sensor for Acura TLX 2.4L
| Brand | GRIZZLY AUTO |
|---|---|
| Manufacturer Part Number | FGA-001269-ga |
| Replaces Part Numbers | 36531-5A2-A01, 234-9131 |
This GRIZZLY AUTO upstream oxygen sensor is a direct-replacement style unit intended for the Acura TLX 2.4L and installs in the exhaust manifold or header like the factory sensor. It monitors oxygen content and provides the ECU with the feedback needed to control fuel trim and catalytic converter efficiency. The sensor features a reinforced heating cover and threaded coating to improve durability and warm-up time, and the manufacturer highlights stainless steel construction and double laser welding for sealing. In practical use it restores proper closed-loop fueling, can clear O2-related trouble codes when fitment is correct, and should improve idle stability and fuel economy compared with a failing sensor. As a budget option the build and connector design appear serviceable, but long-term longevity versus a factory-quality sensor is uncertain and compatibility depends on matching the plug shown in the listing. Expect a functional, cost-conscious replacement for routine repairs, though professional verification of fit and connector match is recommended before purchase.
Best for: Practical, budget-conscious owners who prioritize a low-cost, functional replacement to restore fuel control and clear oxygen-sensor faults on an Acura TLX 2.4L.
Less Ideal for: Drivers seeking a long-term, dealership-grade replacement or those who prefer fully validated OEM-sourced parts for extended warranty coverage.
- Designed to fit Acura TLX 2.4L upstream position and match factory connector style
- Built-in heater and reinforced cover for faster warm-up and more stable readings
- Stainless steel body with double laser welding for improved sealing
- Thread coating to resist corrosion and help maintain stable installation
- Long-term durability and lifespan are not established compared with factory-quality parts
- Must verify plug and thread match before installation to avoid fitment issues
Verdict A cost-focused, functional upstream oxygen sensor for the Acura TLX 2.4L that restores proper fuel feedback at a budget price but may not match OEM longevity.
5. LHWV 2-Pack Upstream Air Fuel Ratio Oxygen Sensor (250-25059)
| Brand | LHWV |
|---|---|
| Material | Stainless Steel |
| Measurement Accuracy | ±0.02V |
| Measuring Range | 0.7V – 2.2V |
| Response Time | 50 Milliseconds |
These LHWV oxygen sensors are replacement upstream sensors intended to measure exhaust oxygen and report air-fuel ratio to the ECU. Constructed with a zirconia sensing element, platinum coating, and stainless steel housing, they are built to tolerate high exhaust temperatures and provide a steady current-style output with a reported 50 ms response time. Typical use is direct replacement of failed upstream sensors on supported Acura TLX V6 3.5L applications within the listed years, restoring accurate fuel trim readings and smoothing running issues caused by a faulty sensor. The package includes two sensors for front and rear upstream positions when needed. Practical benefits are straightforward: factory-style threaded mount, a measured voltage range that matches ECU inputs, and heat-resistant construction for longer life in hot exhaust environments. Limitations are that fitment must be verified against the vehicle sub-variant and California-specific emissions versions may not be compatible, and this is an aftermarket unit so installer verification and occasional ECU relearn or connector adaptation may be required.
Best for: Risk-averse mainstream buyers who prioritize restoring reliable, factory-like engine operation and prefer a ready-to-fit replacement for Acura TLX V6 models with minimal experimentation.
Less Ideal for: Drivers who need emissions-certified parts for California-registered vehicles or buyers seeking branded OEM-sourced sensors should look elsewhere.
- Sold as a two-piece set covering upstream positions so you get both sensors when replacing paired units
- Zirconia element with platinum coating and 310S stainless shell for improved heat and corrosion resistance
- Threaded mount and current-style output designed for direct replacement and ECU compatibility
- Fast response time (50 ms) supports timely fuel trim corrections during transient engine conditions
- Not guaranteed compatible with California emissions or all sub-variants so exact vehicle verification is necessary
- Aftermarket part may require connector checks or ECU relearn steps during installation
Verdict A practical two-piece aftermarket upstream O2 sensor set that aims to restore correct air-fuel feedback on Acura TLX V6 models, provided you confirm exact emissions and sub-variant fitment.
6. AUTO OCCASION Oxygen Sensor 2-Pack (Fits Acura TLX 2.4L L4)
| Fitment | Acura TLX 2.4L L4 (2015-2020) |
|---|---|
| Part numbers | 234-9131, 234-4574 |
| Mounting type | Flange Mount |
| Output type | Push-Pull |
This AUTO OCCASION two-pack supplies both upstream and downstream oxygen sensors intended for the Acura TLX 2.4L L4. Installed in the exhaust stream, these sensors report oxygen levels to the engine control unit so the ECU can adjust air-fuel mixture and maintain emissions compliance. The kit includes mounting flange-style sensors and the connector-style output needed for direct replacement, and the listing shows part numbers that match common factory replacements. For a practical owner wanting to repair or refresh both sensors at once, the set simplifies sourcing and can save time versus buying individually. Installation typically requires access to the exhaust manifold and may need an oxygen-sensor socket or professional installation if rusted fasteners are present. The sensors appear to be a straightforward factory-quality replacement, but the listing lacks long-term durability data and an explicit performance spec for warm-up time or heater resistance, which matters for mileage and emissions over time.
Best for: Practical optimizers who want a cost-effective, matching pair to restore proper fuel trim and emissions control on an Acura TLX and prefer replacing both sensors at once to avoid repeat labor.
Less Ideal for: Those seeking a performance-grade or long-lifespan sensor backed by published durability testing should consider higher-end branded options with documented specs.
- Includes both upstream and downstream sensors so both positions can be replaced at once.
- Listed as compatible specifically with the Acura TLX 2.4L L4 fitment used 2015–2020, simplifying fit checks.
- Flange mount and standard connector output for direct, visual match to factory sensor connections.
- No long-term durability or heater resistance specifications provided to verify lifespan under high-heat conditions.
- Requires basic tools or shop labor for removal and installation if oxygen sensor bolts are seized.
Verdict A budget-friendly two-pack that gives Acura TLX owners a convenient, direct-replacement option to restore oxygen-sensor function, though it lacks published long-term durability specs.
7. A-Premium 2‑Piece Downstream Oxygen Sensor Kit
| Material | Ceramic |
|---|---|
| Maximum Supply Voltage | 12 Volts (DC) |
| Mounting Type | Threaded |
| Output Type | Push-Pull |
This A-Premium kit supplies two downstream (post-catalytic) heated oxygen sensors intended as direct replacements on compatible Acura and Honda V6 models. Each sensor mounts with a threaded fitting and connects via the included male-style connector and wiring, so installation is the same basic process as swapping a factory downstream sensor. The kit ships with two sensors and is marketed for downstream front and rear positions only, so it will not replace upstream sensors. Notable features include a heated element for faster warm-up and a four‑wire connector design. In practice the sensors restore closed‑loop fuel trims and emissions monitoring when the original downstream sensors have failed, and many buyers report straightforward fit and normal operation after installation. However there are reported fitment mismatches for some model years and connector pin counts, so confirm connector and pin configuration before buying. The manufacturer offers a one-year unlimited‑mileage guarantee, but expect variation in longevity compared with factory parts.
Best for: Balanced buyers who want an affordable factory-replacement style downstream sensor kit to restore emissions monitoring and fuel trim on specified Acura TLX and other compatible V6 models without seeking premium OEM parts.
Less Ideal for: Buyers seeking upstream sensors, exact OEM fit for every model year, or long-term OEM-level durability should consider factory-quality alternatives or verify plug/pin compatibility before purchasing.
- Includes two downstream heated sensors for front and rear replacement
- Threaded mount and standard male connector simplify direct swap installation
- Heated element speeds sensor readiness for accurate closed‑loop operation
- Manufacturer provides a one‑year unlimited‑mileage guarantee
- Does not include upstream (pre‑cat) oxygen sensors so additional purchases may be needed
- Connector pin counts and fitment vary by year so some vehicles may require adapter or return
- Package does not include OEM-style retention clips found on some factory installations
Verdict A practical, cost-conscious two-piece downstream sensor kit that restores post-catalyst monitoring if you confirm connector fitment for your Acura TLX.
Choosing the Right Acura TLX Oxygen Sensor: Key Factors to Consider
Fitment and Connector Compatibility
Correct fitment is essential because the oxygen sensor must match the TLX's exhaust bung size, thread pitch, and connector type for a secure, leak-free installation. Mismatched threads can damage exhaust components and lead to exhaust leaks that alter sensor readings.
Connector compatibility matters to avoid cutting and splicing factory wiring. A direct-fit sensor with the correct OEM-style plug saves time and maintains the vehicle's electrical integrity. Verify the sensor location specification so you get the right upstream or downstream unit for your engine.
Sensor Type and Response Time
Sensors come in different types, such as narrowband or wideband, and each type has distinct signal characteristics that affect fuel control. The factory TLX system expects a particular signal profile; using a sensor with slower response time can cause delayed fuel trim adjustments and drivability issues.
Faster response improves the engine control unit's ability to correct air-fuel ratio during transient conditions. Check the sensor's quoted response time and whether it matches the control strategy used by the vehicle's engine management system.
Heater Circuit and Warm-Up Performance
A functioning heater element allows the oxygen sensor to reach operating temperature quickly, which reduces the time the engine runs in open-loop mode after startup. Faster warm-up leads to lower cold-start emissions and steadier idle behavior shortly after ignition.
If the TLX engine management relies on a heated sensor, choose a unit with the correct heater specifications and adequate durability. Confirming heater resistance and wiring arrangement helps avoid electrical faults that can trigger diagnostic codes.
Durability and Materials
The exhaust environment exposes sensors to high temperatures, vibrations, and contaminants like oil and road salt. Sensors made with robust protective sheaths, quality ceramic elements, and corrosion-resistant threads will last longer and maintain accurate readings under real-world conditions.
Durable sensors reduce the chance of premature failure, which can otherwise lead to repeated replacements and potential damage to exhaust ports or wiring if threads seize or corrode.
Electrical Specs and Compatibility With Engine Control
Matching the sensor's electrical output range and heater draw to the vehicle's ECU expectations is important to avoid erratic readings or electrical faults. Look for documented voltage ranges, heater current, and recommended operating temperatures to ensure compatibility.
Sensors with clearly published specifications make it easier to confirm they will interface properly with the TLX's diagnostic and control systems, reducing the chance of diagnostic trouble codes after installation.
Installation Ease and Hardware
Consider whether the sensor includes a pigtail, anti-seize on the threads, and sufficient cable length for routing. These details influence installation time and the need for additional parts or tools. A preassembled plug and adequate heat shielding simplify a straightforward swap.
Good installation features also reduce the risk of wiring damage during fitment and help maintain a reliable connection over time, which is especially useful if access to the sensor is tight on the vehicle.
FAQ
How do I know if my Acura TLX oxygen sensor is failing?
Common signs include a persistent check engine light, reduced fuel economy, rough idle, or increased exhaust emissions. You may also notice a hesitation during acceleration. A diagnostic scan that returns oxygen sensor related codes often confirms the issue, but symptoms alone do not identify which sensor or cause.
What is the difference between upstream and downstream sensors on the TLX?
Upstream sensors sit before the catalytic converter and primarily influence fuel trim by monitoring exhaust oxygen directly from the engine. Downstream sensors sit after the converter and are used mainly to monitor catalytic converter efficiency. Each location serves a different role for the engine management system.
Can I test an oxygen sensor myself on the TLX?
Basic checks include inspecting the wiring and connector for damage and measuring heater resistance with a multimeter. Dynamic testing typically requires live data from a scan tool to observe voltage swings or sensor response during warm-up. While simple checks are possible at home, comprehensive testing benefits from diagnostic equipment.
Will replacing an oxygen sensor reset the check engine light?
Replacing a failed sensor can clear the underlying issue, but the light may remain until diagnostic trouble codes are cleared by a scan tool or the vehicle completes enough drive cycles to verify the repair. If the light returns, further diagnosis is usually required to rule out related issues.
Do I need a heated oxygen sensor for my TLX?
Many modern vehicles, including the TLX, use heated sensors to reduce warm-up time and control emissions immediately after startup. Whether a specific location requires a heater depends on the OEM design. Check the vehicle's specifications to ensure the replacement includes a heater if the original part had one.
Are aftermarket oxygen sensors as reliable for the TLX as factory-type parts?
Aftermarket sensors can offer good performance, but reliability varies by manufacturer and part quality. Look for units with clear fitment data, documented electrical specs, and positive durability characteristics. Parts that match the vehicle's required specifications tend to perform more consistently.
How We Chose the Best Acura TLX Oxygen Sensor
We started by focusing on parts specifically listed for the Acura TLX model years to ensure correct harness, thread, and connector compatibility. Fitment accuracy was a primary filter because an incorrect thread size or connector can prevent installation or cause wiring issues. Signal response and sensor type were evaluated next, since a sensor that reacts slowly can throw off fuel trim and increase emissions.Durability and materials were assessed to identify sensors designed to tolerate heat and exhaust contaminants typical of the TLX exhaust routing. We also considered the presence and quality of wiring pigtails and mounting hardware to reduce installation hassle. Electrical characteristics such as voltage range, heater element presence, and response time were used to judge suitability for the vehicles engine management system.Items were excluded if they lacked explicit TLX fitment data, omitted heater circuits when required, or did not provide technical specifications. We prioritized parts that meet OE fit and functional expectations rather than generic or unverified listings.
Our full evaluation process is outlined in our review methodology.
Conclusion
Prioritize fitment accuracy and sensor type when choosing an Acura TLX oxygen sensor because those aspects have the biggest impact on drivability and emissions. Pay attention to heater presence, response time, and electrical specifications to ensure the sensor interfaces correctly with the engine control system.Balance durability and ease of installation against the level of technical specification you need. Selecting a sensor that matches the TLX's requirements reduces the chance of installation issues and helps restore proper fuel trim and emissions performance.
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