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Oxygen Sensor Tech Tips
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Products | O2 Sensors
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Engine Examples
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Because engine configurations can vary by vehicle, it’s important to correctly identify the specific positions of all your oxygen sensors – so you replace the correct sensor when one of them fails. The post below provides some guidance in understanding which oxygen sensor to change and a few technical tips to assist in a smooth installation process.
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Engine Examples

Sensor Locations

Refer to your vehicle service manual to determine your sensor locations. If the manual is not available, here are some guidelines that apply to most vehicles:

Location by Code

  • Car makers generally define Bank 1 as the Bank containing Cylinder 1
    • If you don’t know your Cylinder 1 location, ask your auto parts store associate for a cylinder-number- or firing-order diagram for your vehicle. See example at right.
  • Sensor 1 is the upstream sensor and Sensor 2 is generally located after the catalyst (downstream) 
    • On a 3 sensor per bank systemSensor 2 is located on the catalyst and Sensor 3 is located after the catalyst.

Catalog Locations

  • The front of the engine contains the belt and alternator.
  • The transmission is mounted to the rear of the engine. 
  • Left and right are defined looking from the rear to the front of the engine. 
    • On rear wheel drive applications, this is the view from the drivers seat.
  • Use the bank detail (at left) to determine if you need a forward, rearward, left or right sensor.
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Disconnect the Battery

Many vehicles require a sensor learning trigger from a scan tool after a new sensor is installed. Clearing codes does not initiate this learning process, but often a 5 minute battery disconnect can.

So, not only is having the battery cable disconnected during service recommended for safety, it can also help you avoid unnecessary service.

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Reference Air

Reference Air

Because Oxygen Sensors require a clean reference air sample to function properly:

  • It’s critical that the wiring harness is not damaged during installation.
  • The use of dielectric grease, cleaners and other chemicals in the connector or on the sensor can cause permanent damage.
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Discolored / Seared Protection Tube Ensures High Quality


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Some customers have noticed a dark discoloration on Bosch sensors and question if the part is used.

  • Rest assured that this discoloration is normal and the result of one of many processes we utilize during manufacturing to ensure quality and performance.
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Sales Assets

Note: WIP - We are using hard-coded values for now.

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