Denso 234-4243 Oxygen Sensor OE-Replacement



Denso 234-4243 Oxygen Sensor OE-Replacement

DENSO's light duty oxygen sensor started to appear on vehicles with the development of fuel injection systems. The basic job of the sensor is to monitor the air fuel mixture under idle, moderate Acceleration and cruise conditions. Under heavy Acceleration the oxygen sensor goes into open loop, which basically means that the engine management computer system ignores the oxygen sensor. Oxygen sensors have a smaller range of limits in detecting and adjusting the difference from an optimum air/fuel ratio. Oxygen sensors, also known as Lambda sensors or oxygen sensors among some vehicle manufacturers, are among the most sensitive and critical components on your car's engine. Earlier fuel injection systems employed one oxygen sensor in the exhaust system to maintain closed-loop air/fuel mixture control. However, today's engines may use as many as four sensors, which monitor not only exhaust gas oxygen content but catalytic converter efficiency as well. In order to perform these functions properly, the sensors must adhere to OE standards within incredibly close tolerances. A malfunctioning or incorrectly calibrated oxygen sensor can hurt driveability and illuminate the malfunction indicator, resulting in costly and time-consuming repairs. DENSO First Time Fit® oxygen sensors are designed to meet those tolerances and more.


  • Corrosion-Resistant Stainless Steel Construction
  • Porous PTFE Filter - Allows Atmospheric Oxygen To Enter The Sensor Without Permitting Water Or Engine Contaminants To Seep Into The Casing
  • Refined Zirconia Element Improves Sensor Response
  • Robotic Laser Weld
  • Double Protection Cover - Maintains Proper Unit Temperature For Quicker Response Times And Protects The Ceramic Element Against Silicone And Lead Poisoning
  • Stainless Steel Housing - Resists Corrosion And Contamination With A Rugged, Watertight Body
  • Aluminum-Oxide Trap Layer - Keeps Silicone And Lead Outside The Ceramic Element Through DENSO's Exclusive Design, Preventing Damage To The Platinum Electrode
  • Superior Design Maximizes Engine Performance While Reducing Fuel Consumption And Harmful Emissions
  • Ensures Smog Test Compliance
  • Limited 90 Day Warranty

  • Specifications:

    Type: Heated
    Connector Style: 4 Wire
    Voltage Range: OEM
    Includes Adapter Fittings: No
    Includes Weather Pack Harness: No
    Includes Weld Fitting: No

    This product is designed to fit the following vehicles:

  • 2009 - 2012 Chevrolet Colorado
  • 2008 - 2014 Chevrolet Express 1500
  • 2008 - 2017 Chevrolet Express 2500
  • 2008 - 2015 Chevrolet Express 3500
  • 2017 - 2017 Chevrolet Express 3500
  • 2008 - 2009 Chevrolet Trailblazer
  • 2009 - 2012 GMC Canyon
  • 2008 - 2009 GMC Envoy
  • 2008 - 2014 GMC Savana 1500
  • 2008 - 2017 GMC Savana 2500
  • 2008 - 2017 GMC Savana 3500
  • 2008 - 2010 Hummer H3
  • 2009 - 2010 Hummer H3T
  • 2008 - 2009 Saab 9-7x
  • From the manufacturer


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    Return policy
    You can return this item within 90 days from the day you receive your online order.

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