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Audi Downstream Oxygen Sensor – Denso
Audi Downstream Oxygen Sensor – Denso
Audi Downstream Oxygen Sensor – Denso
Audi Downstream Oxygen Sensor – Denso

Audi Downstream Oxygen Sensor – Denso

DENSO
Availability:
Out of stock
SKU 234-4990
Sold out
$160.95 - $160.95
$160.95
$160.95 - $160.95
$160.95
CALIFORNIA WARNING

Handling passenger or off-highway motor vehicle parts can expose you to chemicals such as phthalates and lead, which can cause cancer and reproductive harm. To minimize exposure, service the vehicle in a well-ventilated area, wear gloves, and wash your hands. For more information see www.P65Warnings.ca.gov/motor-vehicle-parts.

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This Denso downstream oxygen sensor monitors catalytic converter efficiency by measuring the oxygen content in the exhaust. It helps the ECU ensure proper emissions control and fuel efficiency. This direct replacement fits Audi A8 Quattro models from 2015 to 2018.

Key Features & Benefits

  • Heated Sensor: Quick activation for accurate readings.
  • Direct Fit: Threaded mounting for easy replacement.
  • OEM Cross-Reference: Equivalent to Audi part number 4H0906265D.
  • Improves Emissions Control: Monitors catalytic converter performance.
  • Durable Construction: Built to last with high-quality materials.

Vehicle Fitment

Make Model Years Engine
Audi A8 Quattro 2015–2018 3.0V6

Technical Specifications

Part Number 4H0906265D
Cross Reference Denso 2344990
Connector Gender Male
Mounting Type Threaded
Sensor Type Heated
Thread Diameter 0.708 inches

Installation Notes

Professional installation recommended due to exhaust system access.

About Denso

Denso is a world-leading supplier of automotive technology and a Tier 1 OE manufacturer known for reliability and innovation.

This part also goes by the following cross reference.

Cross Reference Part Number:

Fits These Vehicles 1 application
D4 A8
Make Model Engine Years
Audi A8 Quattro 3.0V6 2015–2018
Fits 1 vehicle applications Check vehicle fitment before ordering View fitment

About this Oxygen Sensor

The DENSO 234-4990 oxygen sensor measures the oxygen in the exhaust so the engine computer can keep the fuel mixture correct. Sensors before the catalytic converter control the mixture; sensors after it monitor the converter's efficiency.

Frequently asked questions

What does an oxygen sensor do?

It reports how rich or lean the exhaust is, and the engine computer adjusts fuel delivery in response. A faulty sensor can make the engine run too rich or too lean.

What are the signs of a failing oxygen sensor?

A check-engine light with oxygen-sensor or fuel-trim codes, poorer fuel economy, rough idle, or a failed emissions test. Exhaust leaks near the sensor can cause similar codes, so check for those too.

How do I know which sensor I need?

Sensors are specific to their position: upstream (before the catalytic converter) or downstream (after it), and on V engines, bank 1 or bank 2. The fault code usually identifies the position; check the product details for the position this sensor fits.

Can I replace an oxygen sensor myself?

Usually, yes, using an oxygen-sensor socket. Many new sensors come with anti-seize already on the threads; if not, use a sensor-safe compound only on the threads, and keep it off the sensor tip.

How do I make sure this oxygen sensor fits my car?

Compare the part numbers listed on this page with the number on your old part or in your vehicle's parts catalog, and check the fitment information. If you are unsure, contact us with your VIN before ordering.

Euromotiv is an independent retailer of OEM, Genuine, and aftermarket automotive parts. We are not affiliated with, endorsed by, or authorized by Audi AG, Volkswagen AG, BMW AG, Mercedes-Benz Group AG, Dr. Ing. h.c. F. Porsche AG, MINI, or any other vehicle manufacturer. All trademarks, logos, and brand names are the property of their respective owners and are used solely for identification and compatibility purposes.