O2 Oxygen Sensor - 1AEOS01031

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How-To & Tools
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Vehicle Fit


  • Brand New Oxygen Sensor
  • Direct Fit
    • Correct Connector No cutting or splicing
    • Correct wire length (49")
  • Upstream or Downstream Sensor as listed per application
  • 4 Terminal Plug Configuration
  • Built and tested to strict quality control standards

Note: For clarification purposes:

  • Upstream location is between the catalytic converter and the engine
  • Downstream location is between the catalytic converter and the tailpipe

Install note:

You may be required to reset the vehicle computer after installation of this part.

Our electrical and electronic parts are subject to strict quality control testing. Please ensure proper diagnosis of this item before purchasing as the item cannot be returned once installed or plugged in.

Item Condition: New

Attention California Customers:

WARNING: Cancer and Reproductive Harm -

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser.

  1. step : Identifying your Oxygen Sensors (0:57)
    • Upstream oxygen sensors are located in between the engine and the catalytic converter
    • Downstream oxygen sensors are located in the catalytic converter or farther away from the engine than the catalytic converter
    • Locate your vehicle's firing order diagram
    • The bank that contains cylinder one is bank one
    • The bank that does not contain cylinder one is bank two, even if it does not contain cylinder two

Tools needed for replacement:

    1A - No Tools Needed

  • No Tools Needed

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Year Make Model Description
2000Audi A4 Audi A4 L4 1.8L Turbo (Engine ID ATW) Upstream O2 Oxygen Sensor
2000Audi A4 Quattro Audi A4 Quattro L4 1.8L Turbo (Engine ID ATW) Upstream O2 Oxygen Sensor
2000-2002Volkswagen Cabrio VW Cabrio Upstream O2 Oxygen Sensor
2001Volkswagen Eurovan VW Eurovan V6 2.8L (Engine ID AXK) Downstream O2 Oxygen Sensor
2002-2003Volkswagen Eurovan VW Eurovan Downstream O2 Oxygen Sensor
2004Volkswagen Jetta VW Jetta L4 2.0L (Engine ID AVH) Upstream O2 Oxygen Sensor
2000-2001Volkswagen Passat VW Passat L4 1.8L Turbo (Engine ID ATW) Upstream O2 Oxygen Sensor
2004-2007Volkswagen Touareg VW Touareg V8 4.2L Downstream O2 Oxygen Sensor Passenger Side
2005Volkswagen Touareg VW Touareg V6 3.2L Downstream O2 Oxygen Sensor Passenger Side
Part #: 1AEOS01031

Order must be placed by 4pm ET
Delivery options for:

Estimated Arrival Cost

Deliveries made to PO Boxes and FPO may take longer. See our Shipping & Delivery for more information.

Get it in: 2 - 4 Business Days

Want it sooner? Choose Next Day Air at Checkout

How-to Video:

(03:08 min)