DENSO 45YPXPS89 Upstream Air Fuel Level Sensor

( Brand: Denso ), ( Manufacturer Part Number: 45YPXPS89 ), ( Type: Air Fuel Ratio Sensor ), ( Placement On Vehicle: Upstream ), ( Fits 1: 2002-2004 Acura Rsx ), ( Fit Note: First Time Fit ), ( Manufacturer Warranty: 12 Month Warranty ), ( Attention: Please Read All Notes To Confirm Fitment ), ( Cs-sku: 400 )

Review DENSO Upstream Air Fuel Ratio Sensor Acura fits RSX 2002–2004

The Denso 45YPXPS89 Upstream Air Fuel Ratio Sensor is an essential component of the fuel delivery system in certain AcuraRSX models from 2002, 2003, and 2004. This sensor plays a crucial role in maintaining optimal engine performance and ensuring the vehicle's emission control system functions effectively.

The Denso 45YPXPS89 is an upstream air fuel ratio sensor, meaning it is located before the engine's catalytic converter. It continually measures the air-fuel mixture entering the engine cylinders to maintain the ideal air-fuel ratio for efficient combustion and optimal engine performance. A stable air-fuel ratio is essential for reducing harmful emissions and improving fuel economy.

This sensor uses a heated zirconia element to convert the air-fuel mixture's oxygen content into an electrical signal. The sensor then transmits this signal to the engine control module (ECM), which adjusts the fuel delivery system accordingly to maintain the desired air-fuel ratio. The sensor's heating element ensures that it functions effectively in cold temperatures, allowing the vehicle to start and run smoothly even in challenging conditions.

The Denso 45YPXPS89 is designed to meet or exceed OEM specifications and is engineered for durability and long-lasting performance. Its compact design allows for easy installation, making it a popular choice among automotive enthusiasts and professional mechanics for replacement and upgrade applications.

When it comes to maintaining or repairing your AcuraRSX, choosing a high-quality, reliable air fuel ratio sensor like the Denso 45YPXPS89 is essential. By ensuring your engine receives the correct air-fuel ratio, you can improve performance, extend the life of your engine, and reduce harmful emissions, making this sensor a valuable investment for your vehicle.

Denso 45YPXPS89 Upstream Air Fuel Sensor for Acura RSX (2003, 2002, 2004): A Comprehensive Analysis

The Denso 45YPXPS89 Upstream Air Fuel Sensor is a crucial component for ensuring optimal engine performance in the Acura RSX models of 2003, 2002, and 2004. In this analysis, we will discuss the advantages and disadvantages of purchasing this sensor to help you make an informed decision.

1. Superior Sensitivity: The Denso 45YPXPS89 sensor offers enhanced sensitivity, which enables precise fuel-air mixture adjustments. This results in improved combustion efficiency, reduced emissions, and potential fuel savings.

2. OEM Design: Denso is a reputable manufacturer, and this sensor is an original equipment manufacturer (OEM) part. It is designed to meet or exceed the vehicle manufacturer's specifications, ensuring a reliable and accurate fit.

3. Durability: The sensor is engineered to withstand the harsh conditions of the engine bay. Its robust design and high-quality materials help prolong its lifespan, minimizing the need for frequent replacements.

4. Facilitates Diagnostics: By using a compatible scan tool, this sensor can help diagnose potential fuel system issues, providing valuable information for maintaining your vehicle.

1. Cost: The Denso 45YPXPS89 sensor may be pricier compared to aftermarket alternatives. However, its OEM quality, superior sensitivity, and durability may justify the investment for some consumers.

2. Complex Installation: Installing the sensor may require advanced automotive knowledge and specialized tools. It's essential to follow the instructions carefully to avoid causing any damage to the sensor or other vehicle components.

The Denso 45YPXPS89 Upstream Air Fuel Sensor is an excellent choice for Acura RSX owners seeking OEM quality, enhanced sensitivity, and durability. Although it comes with a higher price tag and a complex installation process, the benefits it offers can contribute to improved engine performance, reduced emissions, and potential fuel savings.

If you prioritize precise fuel-air mixture adjustments, reliability, and accuracy, the Denso 45YPXPS89 sensor is a worthwhile investment for your Acura RSX. Ensure you have the necessary tools and knowledge to install it properly or consult a professional mechanic to ensure the best possible outcome.

Details:

Upstream Air Fuel Ratio Sensor Denso 45YPXPS89 for Acura RSX 2003 2002 2004: Position: Brand: condition: New, Notes First Time Fit, OEM Detailed Applications , 2002 - 2004 RSXK20A2, RSXK20A3Manual. 12 Month Warranty.

part #: 45ypxps89 price

• $317.14

specifications acrasensor:

• for models: Rsx
• for makes: Acura
• for years: 2002-2004
• brand: Denso
• mpn: 45ypxps89
• type: Air Fuel Ratio Sensor
• placement on vehicle: Upstream
• fits 1: 2002-2004 Acura Rsx
• fit note: First Time Fit
• manufacturer warranty: 12 Month Warranty
• attention: Please Read All Notes To Confirm Fitment
• cs-sku: 400

general acrasensor:

• condition: New
• Car Truck Parts Accessories > Air Fuel Delivery > Air Intake Fuel Sensors

payments acrasensor:

• wallet: Google-pay
• credit card: Visa
• other

returns acrasensor:

• policy: Returns Accepted
• time: 30 Days
• paid by: Seller

offer acrasensor:

• options: Ship-to-home
• quantity: 1
• started: May 12, 2026
• availability: In Stock
• sold: 0

seller acrasensor:

• rating: 97.3%
• # reviews: 57962
• city: Austin, Texas

shipping acrasensor:

• service: Standard
• class: Standard
• cost: $0.00
• type: Fixed
• transit: 3-7 Days

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