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Audi Oxygen Sensor – Upstream 078906265B – Denso 2343101
Audi Oxygen Sensor – Upstream 078906265B – Denso 2343101
Audi Oxygen Sensor – Upstream 078906265B – Denso 2343101
Audi Oxygen Sensor – Upstream 078906265B – Denso 2343101

Audi Oxygen Sensor – Upstream 078906265B – Denso 2343101

DENSO
Availability:
Out of stock
SKU 234-3101
Sold out
$52.95 - $52.95
$52.95
$52.95 - $52.95
$52.95
CALIFORNIA WARNING

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This Denso upstream oxygen sensor replaces Audi part 078906265B for 2.8L V6 engines in various Audi models from the 1990s. It monitors exhaust oxygen before the catalytic converter for precise air-fuel ratio control. Improved engine performance and fuel efficiency.

Key Features & Benefits

  • Position: Upstream (pre-cat) for air-fuel mixture control.
  • Heated: Fast response and stable readings.
  • Wide Fitment: Compatible with Audi 90, 100, A6, Cabriolet with 2.8L V6.
  • Threaded: 0.7 inch thread diameter.
  • OE Replacement: Exact fit for 078906265B.

Vehicle Fitment

Make Model Years Engine
Audi Cabriolet 1994–1998 2.8V6
Audi A6 Quattro 1995–1998 2.8V6
Audi A6 1995–1998 2.8V6
Audi 90 Quattro 1993–1995 2.8V6
Audi 90 1993–1995 2.8V6
Audi 100 Quattro 1993–1994 2.8V6
Audi 100 1993–1994 2.8V6

Technical Specifications

Part Number 078906265B
Denso Number 2343101
Sensor Type Heated
Position Upstream
Connector Gender Male Female
Mounting Type Threaded
Thread Diameter 0.7 inches

Installation Notes

Direct replacement; verify connector compatibility for your specific model year.

About DENSO

Denso is a leading OE supplier of oxygen sensors known for reliability and precision.

This part also goes by the following cross reference.

Cross Reference Part Number:

Fits These Vehicles 7 applications
B4 Cabriolet
Make Model Engine Years
Audi Cabriolet 2.8V6 1994–1998
C4 A6
Make Model Engine Years
Audi A6 Quattro 2.8V6 1995–1998
Audi A6 2.8V6 1995–1998
B4 90
Make Model Engine Years
Audi 90 Quattro 2.8V6 1993–1995
Audi 90 2.8V6 1993–1995
C4 100
Make Model Engine Years
Audi 100 Quattro 2.8V6 1993–1994
Audi 100 2.8V6 1993–1994
Fits 7 vehicle applications Check vehicle fitment before ordering View fitment

About this Oxygen Sensor

The DENSO 234-3101 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.