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  3. WALKER 27BYTRW41

WALKER 27BYTRW41 Downstream Oxygen Sensor El

fits model: Rsx. make: Acura. year: 2001–2004.

27bytrw41 Walker Downstream Oxygen Sensor For Acura Rsx El 2002 2003 2001 2004

( Brand: Walker ), ( Manufacturer Part Number: 27BYTRW41 ), ( Type: Oxygen Sensor ), ( Placement On Vehicle: Downstream ), ( Fits 1: 2002-2004 Acura Rsx ), ( Fits 2: 2001-2002 Acura El ), ( Fit Note: Oe Replacement B1s2 ), ( Manufacturer Warranty: 12 Month Warranty ), ( Attention: Please Read All Notes To Confirm Fitment ), ( Cs-sku: 400 )

Review WALKER Downstream Oxygen Sensor Acura El fits RSX 2001–2004

The TRW 27BYTRW41 Downstream Oxygen Sensor is specifically designed for use in Acura RSX models from the years 2001 to 2004. This sensor plays a crucial role in the vehicle's emissions system, monitoring the amount of unburnt oxygen in the exhaust gases to ensure optimal fuel-air mixture and efficient combustion.

The TRW 27BYTRW41 is a zirconia oxygen sensor, which is known for its high sensitivity and durability. The sensor's ceramic element is coated with a thin layer of zirconia, which changes color in response to the amount of oxygen present in the exhaust gases. This color change is then detected by the sensor's electrical wiring, which sends a signal to the vehicle's engine control module to adjust the fuel-air mixture accordingly.

The sensor is designed to be installed in the exhaust system downstream of the catalytic converter, making it a downstream oxygen sensor. This location allows the sensor to measure the effectiveness of the catalytic converter in reducing emissions.

The TRW 27BYTRW41 Downstream Oxygen Sensor is a direct replacement for the original equipment sensor, ensuring a perfect fit and function. It is manufactured to meet or exceed OEM specifications for accuracy, durability, and resistance to thermal shock.

The sensor comes packaged in protective packaging to ensure safe transportation and handling. Installation is straightforward, and the sensor can be easily removed and replaced without requiring any major modifications to the vehicle.

In summary, the TRW 27BYTRW41 Downstream Oxygen Sensor is a high-performance replacement part designed specifically for Acura RSX models from the years 2001 to 2004. It ensures optimal fuel-air mixture and efficient combustion by monitoring the oxygen content in the exhaust gases, and is a direct replacement for the original equipment sensor with easy installation.

Pros and Cons of Buying a Downstream Oxygen Sensor (TRW Part Number: 27-121-41) for Acura RSX (Model Years: 2002, 2003, 2001, 2004)

1. Overview:

The downstream oxygen sensor (also known as the lambda sensor or oxygen sensor) is a crucial component of your Acura RSX's exhaust system. This sensor measures the amount of unburnt oxygen in your car's exhaust gases and helps the engine manage the air-fuel mixture for optimal performance and emissions. In this context, we will discuss the pros and cons of purchasing a new TRW downstream oxygen sensor (part number: 27-121-41) for your Acura RSX.

2. Pros:

a. Improved Engine Performance: A faulty oxygen sensor can cause your engine to run rich (too much fuel) or lean (too little fuel), leading to poor fuel efficiency, reduced power, and increased emissions. Replacing the faulty sensor with a new one can help restore the engine's performance and improve fuel economy.

b. Fault Code Elimination: A bad oxygen sensor can trigger various fault codes in your car's diagnostic system. Replacing the sensor can eliminate these codes and prevent the Check Engine Light from illuminating.

c. Preventing Further Damage: A faulty oxygen sensor can cause other components in your exhaust system to fail, leading to costly repairs. Replacing the sensor proactively can help prevent these additional expenses.

3. Cons:

a. Cost: Replacing a downstream oxygen sensor can be an expensive repair, with parts and labor costs ranging from $150 to $350 or more, depending on your location and the mechanic's rates.

b. DIY Complexity: While some car owners might feel comfortable replacing the sensor themselves, the process can be complex and time-consuming. It involves removing various components from the exhaust system and using specialized tools to remove and install the sensor.

4. Conclusion:

In conclusion, purchasing a new downstream oxygen sensor (TRW part number: 27-121-41) for your Acura RSX (model years: 2002, 2003, 2001, 2004) comes with benefits such as improved engine performance, fault code elimination, and prevention of further damage. However, it also comes with potential drawbacks, including the cost of the repair and the complexity of the DIY process. Ultimately, the decision to replace the sensor depends on your car's current condition, your budget, and your willingness to tackle the repair yourself.

5. Recommendation:

If you're experiencing symptoms of a faulty downstream oxygen sensor, such as poor fuel economy, reduced power, and a Check Engine Light, it's recommended to have the sensor inspected and replaced by a professional mechanic. While the cost may be significant, the benefits of restoring your engine's performance and preventing further damage can outweigh the initial expense. If you're comfortable with the DIY process and have the necessary tools, you may choose to replace the sensor yourself. However, keep in mind that the process can be complex and time-consuming.

Details:

Sensor Type: Narrow-Band. Determines the oxygen content of exhaust gas, monitoring air fuel ratio for combustion efficiency. Detailed Applications Vehicle Engine, 2001 - 2002 Acura EL1.7L 4 Cl, 2002 - 2004 RSX2.0L Cl. Measures oxygen levels to fine-tune air-fuel mixture, improving fuel economy and saving costs.

Coated in with electrodes made of a gas-permeable platinum layer. Downstream Oxygen Sensor Walker 27BYTRW41 for Acura RSX EL 2002 2003 2001 2004: Position: Brand: condition: New, Notes OE Replacement B1S2 Features: Coating prevents contamination and erosion of the electrode surfaces by combustion residue particulates in exhaust gases. Monitors exhaust gases and reduces pollutants for a cleaner environment.

part #: 27bytrw41 price

  • $49.17

specifications acrasensor:

  • for models: Rsx
  • for makes: Acura
  • for years: 2001-2004
  • brand: Walker
  • mpn: 27bytrw41
  • type: Oxygen Sensor
  • placement on vehicle: Downstream
  • fits 1: 2002-2004 Acura Rsx
  • fits 2: 2001-2002 Acura El
  • fit note: Oe Replacement B1s2
  • manufacturer warranty: 12 Month Warranty
  • attention: Please Read All Notes To Confirm Fitment
  • cs-sku: 400

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  • started: May 9, 2026
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  • condition: New
  • Car Truck Parts Accessories > Air Fuel Delivery > Air Intake Fuel Sensors

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for models: rsx, for makes: acura, for years: 2001-2004, type: oxygen sensor, placement on vehicle: downstream, fits 1: 2002-2004 acura rsx, fits 2: 2001-2002 acura el, fit note: oe replacement b1s2, manufacturer warranty: 12 month warranty, attention: please read all notes to confirm fitment, cs-sku: 400,
category: auto parts > car truck parts accessories > air fuel delivery > acura air intake fuel sensors, sku: 6385971201263881,
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