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Oxygen Sensor Position Guide

How Do I Identify the Correct Sensor?

Most vehicles have multiple oxygen sensors. Understanding the location terminology in catalog data and diagnostic tools is important to choosing the correct sensor. Catalog data may contain additional vehicle criteria that requires careful selection.

To select the correct oxygen sensor:

1. Start by using the vehicle lookup to identify sensors that may fit your application. Click into a part to view detailed fitment information.

2. Use the Vehicle Information notes to further narrow the sensors that fit your particular vehicle. (See the vehicle information glossary below for additional information on vehicle information notes.)

Sensor Vehicle Information Notes

3. Use the Position notation to identify the basic sensor location. Downstream typically means after the catalyst, Upstream typically means before the catalyst. Left typically means to the driver's left, Right typically means to the driver's right. See below for additional information on location titles.

Sensor Position Notes


Additional Location Titles

While the Position note will provide a general sensor location, the Vehicle Information notes may include more specific location information. These location titles may be different than what is used by a diagnostic tool. Use these diagrams to assist in identifying sensor locations.

Upstream vs. Downstream Sensor Location

Right vs. Left Sensor Location Chart


Vehicle Information Glossary

The Vehicle Information notes may include additional information that further specifies the exact vehicle(s) the sensor will fit.

Some of this vehicle information can be found on the emissions system label, which may be located in the door jamb, on the front radiator support, strut tower plate, or under the engine hood.

Chassis #

Example: "To Chassis # 284000" or "From Chassis # 284001"

The Chassis ID is the last 6 digits of the vehicle's VIN number.

Chassis ID on Emissions System Label


Country of Manufacture/Assembly

Example: "Japan Built" or "USA Built"

Manufacturing Country on Emissions System Label


Emissions Standard

Example: "with ULEV" or "Except ULEV"

Emissions Standard on Emissions System Label

Example: "with California Emissions" or "without California Emissions"

See the article Does My Vehicle Have California Emissions Standards (CARB)?


Gross Vehicle Weight Rating (GVW)

Example: "Over 8500lb GVW" or "Below 8500lb GVW"

GVW on Emissions System Label


Manufacturing Date

Example: "To 04/16" or "From 04/16"

Manufacturing Date on Emissions System Label


Transmission Code

Example: "U660F Trans" or "U151E Trans"

Transmission Code on Emissions System Label

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