1. Acura Sensors For Sale
  2. sku: 4612600158422673
  3. DENSO FIRST TIME FIT 21HB42W

DENSO FIRST TIME FIT 21HB42W Upstream Air Fuel Level Sensor

fits model: Tsx. make: Acura. year: 2004–2008.

21hb42w Denso First Time Fit Upstream Air Fuel Ratio Sensor Fits 2004-2008 Acura Tsx

( Brand: Denso First Time Fit ), ( Manufacturer Part Number: 21HB42W ), ( Part Type: Fuel Sensor ), ( Placement On Vehicle: Upstream ), ( Part Details: First Time Fit ), ( Fit Years: 2007 2006 2004 2008 2005 ), ( Cs-sku: 400 )

Review DENSO FIRST TIME FIT Upstream Air Fuel Ratio Sensor Acura fits TSX 2004–2008

The DENSO First 21HB42W Upstream Air Fuel Ratio Sensor is an essential component of the fuel delivery system in select 2004 to 2008 Acura TSX models. Designed and manufactured by DENSO, a leading global automotive technology, manufacturing, and supplier company, this sensor ensures optimal engine performance by accurately measuring the amount of air and fuel mixtures entering the engine.

This upstream oxygen (O2) sensor is strategically located in the exhaust system before the catalytic converter, enabling it to monitor the air-fuel ratio (AFR) before the combustion process takes place. By doing so, it can provide real-time feedback to the engine control unit (ECU), allowing it to adjust the fuel injection and ignition timing for maximum efficiency, reduced emissions, and improved engine performance.

The DENSO First 21HB42W sensor features a heated zirconia element, which increases its sensitivity to oxygen in the exhaust gases, enabling it to function effectively in a wide range of operating temperatures. The sensor's compact design ensures a snug fit in the exhaust system, minimizing the risk of vibrations and ensuring a stable connection to the ECU.

The sensor's resistance value changes based on the oxygen concentration in the exhaust gases, allowing the ECU to calculate the AFR and make necessary adjustments. This continuous monitoring and adjustment process leads to improved fuel economy, reduced emissions, and enhanced engine performance.

The DENSO First 21HB42W Upstream Air Fuel Ratio Sensor is a crucial component of the emission control system, as it helps ensure that the engine operates within the acceptable emissions standards. Its high precision, durability, and reliability make it an ideal choice for drivers seeking optimal engine performance and longevity.

In summary, the DENSO First 21HB42W Upstream Air Fuel Ratio Sensor is a vital component of the fuel delivery and emission control system in select 2004 to 2008 Acura TSX models. Its advanced technology, including its heated zirconia element and ability to monitor the AFR before combustion, enables it to optimize engine performance, improve fuel economy, and reduce emissions. This sensor's high precision, durability, and reliability make it an essential investment for any Acura TSX driver seeking optimal engine performance and longevity.

Denso First 21HB42W Upstream Air Fuel Sensor for 2004-2008 Acura TSX: A Comprehensive Analysis

The Denso First 21HB42W Upstream Air Fuel Sensor is a critical component in maintaining the proper air-fuel mixture in the engine of a 2004-2008 Acura TSX. This analysis aims to provide an informed decision on whether or not to purchase this sensor by discussing its key features, advantages, and potential disadvantages.

Features:

1. OEM (Original Equipment Manufacturer) replacement part: This Denso sensor is specifically designed to fit and function identically to the original part in your vehicle.

2. Wide application: This sensor is compatible with various 2004-2008 Acura TSX models.

3. High-precision design: Denso's advanced technology ensures accurate and reliable air-fuel mixture readings.

Advantages:

1. Enhanced engine performance: A faulty air fuel sensor can cause poor fuel economy, uneven idling, and decreased engine performance. Replacing it with a new one like the Denso 21HB42W can help restore optimal engine performance.

2. Improved emissions: By ensuring the correct air-fuel mixture, this sensor can help minimize harmful emissions from your vehicle, contributing to a cleaner environment.

3. Cost-effective: While the upfront cost of a new sensor may seem high, the long-term benefits of improved fuel efficiency and reduced repair costs for related issues make it a cost-effective solution.

Disadvantages:

1. Installation complexity: Replacing the air fuel sensor is not a simple task and requires some mechanical knowledge or professional assistance.

2. Cost: While the sensor itself may be cost-effective, the labor costs associated with installation can add up.

Conclusion:

The Denso First 21HB42W Upstream Air Fuel Sensor for the 2004-2008 Acura TSX is an essential component for maintaining optimal engine performance and reducing harmful emissions. Its high-precision design, wide application, and OEM fit make it an excellent choice for those seeking a reliable replacement part. However, the complexity and cost of installation must be considered when making a purchasing decision. Ultimately, if you value the benefits of a properly functioning air fuel sensor and have the means to install it, this sensor is a worthwhile investment for your Acura TSX.

Details:

Condition: New OEM Vehicle Fitment, 2004 - 2008 Acura TSX. Reduces emissions by keeping the air-fuel mixture at an optimum ratio. Tarnish-proof platinum electrodes provides longer life and maintains accuracy. Quick-response planar zircon element can quickly detect oxygen concentration.

Increased performance by mapping a/f ratios throughout rpm range. Reduced fuel consumption and maximizes catalytic converter life. Measures A/F ratios from approximately 12:1 to 19:1.

part #: 21hb42w price

  • $336.92

specifications acrasensor:

  • for models: Tsx
  • for makes: Acura
  • for years: 2004-2008
  • brand: Denso First Time Fit
  • mpn: 21hb42w
  • part type: Fuel Sensor
  • placement on vehicle: Upstream
  • part details: First Time Fit
  • fit years: 2007 2006 2004 2008 2005
  • cs-sku: 400

offer acrasensor:

  • started: May 6, 2025
  • quantity: 2
  • options: Ship-to-home
  • sold: 0
  • availability: In Stock

seller acrasensor:

  • # reviews: 59527
  • city: Huntington, Indiana
  • rating: 95.8%

payments acrasensor:

  • credit card: Mastercard
  • other
  • wallet: Apple-pay

general acrasensor:

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

returns acrasensor:

  • paid by: Buyer
  • Time: 30 Days
  • policy: Returns Accepted

shipping acrasensor:

  • class: Standard
  • cost: $0.00
  • service: FedEx Ground or FedEx Home Delivery
  • transit: 2-6 Days
  • carrier: FedEx
  • type: Fixed
for models: tsx, for makes: acura, for years: 2004-2008, part type: fuel sensor, placement on vehicle: upstream, part details: first time fit, fit years: 2007 2006 2004 2008 2005, cs-sku: 400,
category: auto parts > car truck parts accessories > air fuel delivery > acura air intake fuel sensors, sku: 4612600158422673,
Denso First Time Fit 21HB42W Is Similar To:
acrasensor logo
1 offer $336.92 USD
  • New. Offer #1 priced at $336.92 + $0.00 shipping estimate = $336.92* total. Tarnish-proof platinum electrodes provides longer life and maintains accuracy. 2004-2008 Acura TSX.FREE SHIPPING

Copyright © acrasensor.com