Note: This article contains affiliate links. If you click on these links and make a purchase, I may earn a small commission at no extra cost to you. This helps support my research and content. Read my full affiliate disclosure here.
If your Acura TSX is running roughly, showing poorer fuel economy, or has an illuminated engine light, the oxygen sensor is a common suspect. Choosing the right Acura TSX oxygen sensor matters because fitment, wiring compatibility, and sensor response affect drivability, emissions, and fuel trim behavior.This guide highlights seven shortlisted oxygen sensors selected as the top options for Acura TSX owners. We evaluated each for fitment quality, sensor durability, and electrical compatibility to help you pick a sensor that restores proper air-fuel feedback. Read on to see the criteria we used and what to prioritize when replacing the sensor.
Looking for other parts? See all Acura TSX parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | BELKEBIR Oxygen Sensor Kit (Upstream & Downstream) for 2009–2014 Acura TSX 2.4L |  |
| Most Popular A crowd favorite that many people choose with confidence | NECATUO Upstream Heated Oxygen (O2) Sensor — Compatible with Acura TSX |  |
| Best Quality Built to a higher standard if you want something more solid | BOSCH Premium Fitment Oxygen Sensor (model 18031) |  |
| Best Budget The cheapest option that still gets the job done reliably | OTO-K Oxygen O2 Sensor Compatible with Acura TSX 2.4L (Upstream/Downstream) |  |
| Most Sold A high-volume bestseller chosen again and again | A-Premium 2‑Piece Downstream Oxygen Sensors (Front & Rear) |  |
| Best Value for Money The sweet spot between price and what you get | HTMXJA 2-Pack Upstream and Downstream Oxygen Sensors for 2009–2014 Acura TSX 2.4L |  |
| Best Overall The best all-around choice for most situations | Denso Rear Oxygen (O2) Sensor 234-4797 for Acura TSX / Honda Accord |  |
1. BELKEBIR Oxygen Sensor Kit (Upstream & Downstream) for 2009–2014 Acura TSX 2.4L
| Brand | BELKEBIR |
|---|---|
| Material | Stainless Steel |
| Maximum Supply Voltage | 12 Volts |
| Output Type | electrical signal |
This BELKEBIR kit supplies both the upstream and downstream oxygen sensors needed for the 2.4L Acura TSX. The sensors provide the engine control module with real-time oxygen readings to help maintain proper air/fuel ratio, reduce emissions, and recover fuel economy when a failing sensor triggers limp performance or a check engine light. Installation is the same as a factory replacement: remove the old sensors, screw in the new units and reconnect the wiring harness. The listing notes stainless steel construction and platinum/ceramic sensing elements, which suggest decent heat resistance and longevity under normal driving. Buyers report correct fit and straightforward installation on 2.4L TSX engines, though there are a few reports of failures, so results can vary unit to unit. This kit is practical for DIY replacement or workshop installs where restoring sensor feedback quickly is the priority, but keep in mind occasional quality variation means having a returns plan or testing the sensors after installation is prudent.
Best for: Reliability-focused TSX owners who prioritize restoring proper emissions control and drivability with a direct-fit replacement rather than sourcing dealer parts.
Less Ideal for: Drivers who require guaranteed factory-identical parts from the original manufacturer or need a sensor with documented long-term track record from a major OEM supplier should consider alternatives.
- Sold as an upstream and downstream pair so both sensor positions are covered in one purchase.
- Made with stainless steel and platinum/ceramic sensing elements intended for high-heat exhaust environments.
- Direct-fit compatibility specified for 2009–2014 Acura TSX 2.4L to simplify replacement and reduce fitment guessing.
- Multiple user reports confirm correct fit and easy installation on the 2.4L TSX engine.
- Some buyers report units that failed or did not function, indicating variable quality control.
- No explicit OEM part number backing beyond listed compatible numbers, so exact factory-equivalent performance is not guaranteed.
Verdict A practical, direct-fit upstream and downstream sensor pair for the 2.4L Acura TSX that restores engine oxygen feedback affordably but with some variability in quality.
2. NECATUO Upstream Heated Oxygen (O2) Sensor — Compatible with Acura TSX
| Vehicle compatibility | Acura TSX 2004-2008 |
|---|---|
| Position | Upstream (Bank 1, Sensor 1) |
| Heated | Yes |
| Manufacturer | NECATUO |
This NECATUO upstream heated O2 sensor is a direct replacement part intended for the Acura TSX (2004–2008). It measures exhaust oxygen before the catalytic converter and reports air-fuel mixture to the engine computer, which helps clear a check engine light and restore fuel trim when the original sensor fails. The unit is sold as a single upstream sensor and the listing emphasizes factory-spec fit and straightforward installation, so it is suitable for DIY installers with basic tools and for shops doing a quick swap. Customers report the sensor restored normal running and resolved CELs on many vehicles, though a minority experienced fitment or calibration differences that caused rich running. The sensor arrives with anti-seize on the threads and standard wiring pigtail for plug-and-play on compatible TSX harnesses. Expect the practical benefit of reduced rough running and improved fuel economy when the part matches your car, but be aware that aftermarket sensors can vary in long-term durability and occasional units may not match OEM response exactly.
Best for: Buyers who prioritize convenience and quick repairs for an Acura TSX and want a ready-to-install replacement that gets the car back on the road with minimal fuss.
Less Ideal for: People seeking guaranteed OEM-level longevity or exact factory calibration for performance tuning should consider dealer or known-brand factory-quality replacements instead.
- Made to match factory fit for direct replacement on specified Acura TSX years
- Heated element supports quick operation at engine start and accurate readings
- Includes thread anti-seize and standard connector for plug-and-play installation
- Reported by many buyers to clear CEL codes and restore normal running quickly
- Some users reported vehicles running rich or poor fuel economy after installation, indicating variable sensor response
- As an aftermarket part, long-term durability and exact OEM calibration may differ from factory sensors
Verdict A convenient, plug-and-play upstream heated O2 sensor for Acura TSX owners who need a fast replacement, though OEM-level calibration and long-term consistency can vary.
3. BOSCH Premium Fitment Oxygen Sensor (model 18031)
| Material | Stainless Steel |
|---|---|
| Maximum Supply Voltage | 12 Volts |
| Measurement Accuracy | ±1% |
| Mounting Type | Flange Mount |
This Bosch oxygen sensor is a direct-fit replacement intended to restore the engine control system's ability to measure exhaust oxygen and manage fuel trim. It installs in the exhaust stream and provides an electrical signal to the vehicle's engine control unit so the engine can correct rich or lean conditions. Notable features include a stainless steel, double laser-welded body for corrosion resistance, a fast-acting heater to reach operating temperature quickly, and factory-style connectors with threads pre-coated with anti-seize to simplify installation. In practice the sensor helps recover fuel economy and emissions performance when a worn sensor has caused rough idle or diagnostic trouble codes. Most buyers will find it straightforward to install in a garage or at a shop and expect OEM-compatible fit and function. Some users report occasional variability in gasket durability and a few outlier failures, so while the sensor offers strong performance and build-quality features, a handful of units may show shorter-than-expected service life compared with dealer parts.
Best for: Performance-oriented buyers who prioritize restoring precise air-fuel control and emissions behavior to maintain engine responsiveness and fuel economy.
Less Ideal for: Buyers who want dealer-branded, vehicle-specific parts for guaranteed long-term factory fitment or those unwilling to accept small risk of inconsistent gasket quality.
- Direct-fit, factory-style connector and harness for straightforward installation
- Double laser-welded stainless steel body designed to resist exhaust corrosion
- Fast-acting heater brings the sensor to operating temperature quickly for accurate early readings
- Threads come pre-coated with anti-seize to reduce risk of thread damage during install
- Some reports of brittle or lower-quality gasket at the flange on a minority of units
- Not a vehicle-specific OEM part from the dealer so fit and long-term durability can vary
Verdict A high-quality, fast-heating direct-fit sensor that most performance-focused owners can use to restore precise fuel control, but expect occasional variation in gasket durability.
4. OTO-K Oxygen O2 Sensor Compatible with Acura TSX 2.4L (Upstream/Downstream)
| Compatible vehicles | 2011–2013 Acura TSX 2.4L |
|---|---|
| Part type | Upstream and downstream O2 sensor |
| Materials | Stainless steel, high-temperature materials |
This OTO-K oxygen sensor is a budget-focused replacement designed to fit the 2.4L Acura TSX (2011–2013) as either an upstream or downstream unit. It measures unburned oxygen in the exhaust and sends that signal to the engine computer so fuel trim and emissions controls can be corrected. The sensor is made with stainless steel and high-temperature materials, and the listing says it uses factory-style connections and pre-coated threads to simplify installation. For routine repairs it provides the key function you need to clear a check-engine light and restore correct air-fuel feedback without the premium price. Expect straightforward fitment when replacing a failed sensor on the specified TSX, but keep in mind this is a budget aftermarket part so long-term durability and sensor response may not match higher-end branded replacements. If you need a low-cost, direct-fit swap to get your TSX running properly again, this is a practical choice, but owners seeking maximum longevity or guaranteed OEM-equivalent performance may prefer a more expensive option.
Best for: Budget-conscious owners who need a cost-effective, direct-fit replacement to fix an O2 sensor issue on a 2.4L Acura TSX and prioritize immediate repair value over long-term ownership.
Less Ideal for: Drivers who prioritize maximum longevity or exact factory-quality performance should consider a higher-priced OEM or premium aftermarket sensor instead.
- Direct-fit design for 2.4L Acura TSX upstream or downstream positions
- Uses stainless steel and high-temperature materials suitable for exhaust environments
- Pre-coated threads and factory-style connector aimed at easier installation
- Low-cost option that can clear O2-related check-engine codes and restore fuel trim
- Budget aftermarket construction may not match the long-term durability of higher-end or factory-quality sensors
- Limited supporting documentation and few verified reviews specifically for the Acura TSX application
Verdict A practical, low-cost direct-fit O2 sensor for the 2.4L Acura TSX that gets your emissions system back to working order without a big investment.
5. A-Premium 2‑Piece Downstream Oxygen Sensors (Front & Rear)
| Wire Quantity | 4 |
|---|---|
| Overall Length | 550 mm |
| Mounting Type | Threaded |
| Sensor Type | Heated |
These A-Premium sensors are sold as a two-piece downstream set intended to replace the factory downstream oxygen sensors on compatible V6 Acura and Honda models. They are heated, threaded, and come with a four-wire connector and a 550 mm overall length, which lets them plug into the vehicle wiring harness without requiring additional modifications in most installations. Typical use is as a direct replacement for failed downstream sensors to restore correct oxygen feedback for the emissions system and fuel trim. Benefits include built-in heater elements for faster operation after cold starts and supplied connectors to match factory wiring on many V6 models. Limitations to note are connector pin counts and fitment details vary by year and trim, so this set will not work if your TSX uses a different pin configuration or requires upstream sensors instead. Some buyers reported intermittent fit or early failures, so double-check connector compatibility and be prepared to swap only the affected bank if needed.
Best for: Risk-averse mainstream buyers who prioritize restoring factory-like emissions performance with a low-cost replacement and prefer buying a ready pair to simplify a common repair.
Less Ideal for: Buyers seeking an exact OEM part or those unsure of their vehicle connector configuration should avoid this set until they verify pin count and downstream/upstream requirements with their TSX specifications.
- Sold as a matched front and rear downstream pair for convenience during replacement
- Heated sensor design reduces warm-up time and improves emission control after cold starts
- Threaded mounting and four-wire connector match common factory installations for many V6 Hondas and Acuras
- Connector pin count and fitment vary by model year so it may not match every TSX harness
- Does not include upstream sensors if those are the components you need
Verdict A practical, ready-paired downstream replacement for TSX V6 owners who need a quick fix, but confirm connector pin count before ordering.
6. HTMXJA 2-Pack Upstream and Downstream Oxygen Sensors for 2009–2014 Acura TSX 2.4L
| Compatible vehicles | 2009–2014 TSX L4-2.4L |
|---|---|
| Connector gender | Male/Female |
| Wire quantity | 4 |
| Measurement accuracy | ±1% |
These HTMXJA sensors replace the upstream and downstream O2 sensors on the 2.4L Acura TSX and are sold as a matched two-piece set. They provide continuous voltage signal output to the engine control system for real-time air-fuel monitoring, which helps restore fuel trim accuracy and can clear emission-related check-engine lights when the original sensors are failing. The sensors use a plug-mount connector with a four-wire harness and are marketed to match factory fit and wiring so installation is usually direct without modifications. Practical benefits include lower cost compared with factory replacements and the convenience of replacing both bank sensors at once. Reported limitations are occasional unit defects and the possibility that an aftermarket sensor may still trigger aftermarket-related codes on some vehicles, so diagnostic verification after installation is recommended. Expect typical longevity for an aftermarket sensor but keep a return plan if a unit is DOA.
Best for: A practical optimizer who wants a budget-conscious, complete replacement for a TSX 2.4L that restores emissions monitoring and fuel-trim control without paying factory prices.
Less Ideal for: Drivers seeking guaranteed factory-calibrated sensors for emissions testing or long-term OEM-level durability should consider purchasing a factory-quality sensor instead.
- Sold as matched upstream and downstream pair for complete replacement
- Designed to match factory connector and wiring for plug-and-play installation
- Four-wire output provides necessary signal for modern fuel control systems
- Stainless steel construction and high-temperature resistance for durability
- Some buyers reported defective units or one sensor failing to read
- Aftermarket sensors can sometimes leave an engine light if the vehicle expects factory-specific calibration
Verdict A cost-effective matched upstream/downstream replacement for the 2009–2014 TSX 2.4L that restores oxygen sensing at a fraction of factory cost but may require returns if an individual unit is defective.
7. Denso Rear Oxygen (O2) Sensor 234-4797 for Acura TSX / Honda Accord
| Fitment | 2004-2008 Acura TSX; 2003-2007 Honda Accord |
|---|---|
| Position | Rear |
| Material | Stainless Steel, Zirconium |
| Measuring Range | 0-20% O2 |
This Denso rear oxygen sensor (234-4797) replaces the factory unit on compatible Acura TSX and Honda Accord models to restore proper air-fuel feedback and clear diagnostic codes. It installs in the rear catalytic converter position and comes with anti-seize and instructions to simplify a DIY swap; users typically remove the passenger seat access plug and unbolt the seat for easier connector access. Denso builds the sensor to meet factory-spec performance, with a zirconium sensing element and an aluminum oxide trap layer to resist contamination and extend service life. In practice the sensor brings back normal fuel trim behavior and can resolve check-engine lights tied to the downstream O2 circuit, which also helps pass emissions tests. Limitations include occasional fitment differences to older factory clips or grommets and the need for the correct oxygen-sensor socket and penetrating oil during removal of rusted units. Expect straightforward function but plan for some patience during installation on older cars.
Best for: Balanced buyers who prioritize reliable, factory-quality replacement parts for routine maintenance and emissions compliance on an Acura TSX.
Less Ideal for: Those who need a universal sensor for multiple vehicle types or a low-cost disposable option should consider other alternatives.
- Made to factory-quality standards for direct replacement fit and first-time installation on specified models
- Zirconium sensing element with contamination trap for improved longevity and stable readings
- Includes anti-seize and instructions to aid installation
- Proven to restore fuel trim and clear downstream O2-related check-engine codes
- May differ from original part’s wiring protectors or grommet details which can require reusing clips from the old sensor
- Removal of the old sensor can require penetrating oil and a dedicated oxygen-sensor socket on rusted exhaust hardware
Verdict A factory-quality downstream O2 sensor that reliably restores emissions and fuel-trim performance on the specified Acura TSX and Honda Accord models.
Choosing the Right Acura TSX Oxygen Sensor: Key Factors to Consider
Fitment and Connector Type
Correct physical fit and the right electrical connector are essential because installing a sensor with the wrong thread, heater circuit, or plug can create installation problems and erratic readings. Confirming thread size and connector pinout avoids splicing wires or using adapters, which can introduce failure points or unreliable signals. Manufacturers sometimes offer direct-fit and universal options; for a vehicle-specific repair you usually want a direct-fit unit to match factory mounting and wiring.
Beyond thread and plug compatibility, also check the sensor orientation and harness routing. Proper alignment prevents exhaust leaks and reduces strain on the harness during engine movement, which extends service life and maintains consistent sensor behavior.
Heater Circuit and Warm-Up Time
Many oxygen sensors include an internal heater to bring the sensing element up to operating temperature quickly. A fast warm-up reduces the time the engine runs on open-loop fueling, improving emissions and drivability during cold starts. For vehicles that rely on heated sensors, a faulty or absent heater can trigger diagnostic trouble codes related to the heater circuit.
When choosing a sensor, verify that the heater circuit matches the vehicle wiring and that the manufacturer specifies warm-up time or operating temperature ranges. Durable heater elements and proper heat shielding help sensors maintain consistent performance across a range of ambient conditions.
Sensor Response and Accuracy
The primary job of the oxygen sensor is to provide timely and accurate air-fuel ratio feedback to the engine control unit. Faster, consistent response helps the ECU adjust fuel delivery to maintain efficient combustion and lower emissions. Look for sensors with stable voltage output under varying loads and temperatures to minimize hunting or incorrect fuel trims.
Response characteristics affect drivability during transient conditions like acceleration or deceleration. Sensors that drift slowly or produce noisy signals can cause rich or lean running conditions and may lead to recurring check engine indicators if the ECU detects inconsistent readings.
Durability and Contaminant Resistance
Oxygen sensors operate in a harsh environment where heat, vibration, and contaminants like oil or coolant can shorten life. Choose sensors designed with robust materials, protective coatings, and proper sealing to resist soot, leaded fuel residues, and chemical exposure. Durable construction reduces the likelihood of premature failure and erratic behavior.
Consider the sensor's thermal rating and resistance to thermal cycling, as repeated heating and cooling can cause element degradation. Sensors with proven contaminant resistance tend to maintain calibration longer, which reduces the need for repeat replacements and prevents intermittent diagnostic codes.
Installation Ease and Serviceability
Ease of installation matters because straightforward swap-out reduces labor time and the chance of installation errors. Direct-fit sensors with matching threads, correct plug orientation, and adequate lead length simplify replacement. Some sensors come with anti-seize on the threads or require application of a recommended compound; verify instructions to avoid damaging the sensor during installation.
Also consider access to replacement parts or wiring harnesses and whether the sensor can be serviced without removing surrounding components. Sensors that are easy to install and maintain reduce shop time and lower the risk of cross-threading or connector damage.
Diagnostics and Compatibility with Codes
When diagnosing an oxygen sensor issue, compatibility with the vehicle's diagnostic system and common failure codes is important. Sensors that provide predictable signals for common fault conditions help technicians verify repairs. Ensure the sensor type corresponds to the position and function expected by the ECU, such as upstream versus downstream placement and heater monitoring.
Be aware of common diagnostic trouble codes related to sensors and heater circuits and choose a sensor that allows clear verification of those circuits after installation. Proper documentation of wiring and expected voltage ranges can make post-repair troubleshooting quicker and more reliable.
FAQ
What are common O2 sensor symptoms on an Acura TSX?
Common symptoms often include rough idle, decreased fuel economy, and a persistent check engine light. You may also notice poor throttle response or uneven acceleration. These signs usually indicate the sensor is not providing accurate air-fuel data to the engine control unit.
How do I know if I need an oxygen sensor replacement?
If diagnostic trouble codes related to the sensor or heater circuit appear, or if the vehicle shows consistent drivability issues like rich running or poor fuel mileage, replacement is often warranted. Visual inspection for contamination or physical damage combined with diagnostic data usually determines whether the sensor is the root cause.
Can I install an oxygen sensor myself?
Many owners can install a direct-fit oxygen sensor with basic tools, good access, and careful attention to thread engagement and wiring. Ensure you have the correct sensor orientation and connector, follow torque guidance, and avoid damaging the sensing element. If access is limited or you are uncomfortable with vehicle electricals, professional installation is advisable.
How do upstream and downstream oxygen sensors differ in function?
Upstream sensors monitor the air-fuel mixture before the catalytic converter and provide feedback used for fuel trim adjustments. Downstream sensors are primarily used to monitor catalyst efficiency and verify that exhaust aftertreatment is functioning. Each position has different expectations for responsiveness and signal behavior.
How can I test an oxygen sensor without special equipment?
You can perform basic checks by observing live sensor voltage on an OBD-II scanner and watching how the voltage responds to throttle changes. A properly functioning upstream sensor will toggle conditions as the engine goes between lean and rich. For heater circuit checks, verify voltage and continuity with a multimeter. More definitive testing may require oscilloscope data or professional diagnostics.
How We Chose the Best Acura TSX Oxygen Sensor
We selected sensors based on several Acura TSX-specific criteria that matter in real-world use. First, correct fitment and connector compatibility were mandatory to avoid wiring splices or adapters. Second, sensor response time and voltage stability under typical driving conditions were evaluated as proxies for reliable air-fuel feedback. Third, long-term durability and resistance to exhaust contaminants were considered because sensor failure often comes from heat and soot exposure. Fourth, the availability of direct-fit mounting and correct thread size was required to ensure straightforward installation. Fifth, warranty coverage and manufacturer support were weighed as indicators of quality and long-term value. We excluded universal or generic sensors that require major modifications, sensors lacking clear electrical pinouts for the TSX, and units without documented temperature ratings. The result is a focused list of direct-fit, electrically compatible oxygen sensors chosen for their likely fit, reliable sensing performance, and service life.
Our full evaluation process is outlined in our review methodology.
Conclusion
When replacing an Acura TSX oxygen sensor, prioritize correct fitment, heater compatibility, and reliable response characteristics. Those factors have the biggest impact on drivability, emissions, and diagnostic clarity.Balance ease of installation and long-term durability against the need for fast sensor warm-up and stable voltage output. Using the selection criteria above will help you choose a sensor that restores proper air-fuel control and reduces the likelihood of repeat issues.
Explore More:
- Check out all Acura TSX parts & accessories
- Explore Oxygen Sensors Maintenance & Repair Guides
- Explore Engine
- Browse all Auto Parts
