Is your Kia Optima engine have a rough idle, and the check engine light is on due to a faulty oxygen sensor? Learn how to fix the problem by replacing your vehicle’s oxygen sensor. This guide is step-by-step instructions on how to replace the O2 sensor on a 2016-2020 Kia Optima.

This tutorial will teach how to replace the oxygen sensor (O2) on a Kia Optima. This guide provides instructions on how to replace both the upstream (Bank 1 Sensor 1) and downstream (Bank 1 Sensor 2).

What you will need

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KIA: 2012-13 Forte5, 2011-16 Optima, 2011-14 Sorento, 2011-16 Sportage; Wideband Air-Fuel Ratio Sensor precisely measures air-fuel mixture
  • O2 Sensor (Kia Optima)
  • O2 sensor socket
  • Wrench


  1. Open the hood, pull the hood release under the dashboard, and go into the vehicle.Hood release of 2016-2020 Kia Optima. Then unlock the hood latch and pull the hood up.Opening the hood of the 2016-2020 Kia Optima.
  2. Locate the O2 sensor (Bank 1 Sensor 1) at the top of the exhaust manifold.The O2 sensor on the top.
  3. Remove the O2 sensor on the top using a socket designed to loosen the O2 sensor.The socket to remove the O2 sensor.
  4. Follow the cable of the O2 sensor above and disconnect the clip by pushing it and pulling it out.The electrical connectors of the O2 sensor.
  5. To locate the lower O2 sensor (Bank 1 Sensor 2), Jack up the vehicle and support the vehicle with jack stands.Jacking up the Kia Optima 2016-2020.
  6. Go under the vehicle and locate the O2 sensor behind the engine.The O2 sensor below the engine.
  7. Remove it using a wrench, follow the cable and disconnect the connector.Removing the electrical connector of the O2 sensor below.

It is not necessary to replace both oxygen sensors at the same time. While replacing both sensors simultaneously is recommended, replacing only the faulty O2 sensor is acceptable.

Check Engine Light Still On


If the check engine light is still on after replacing your vehicle’s oxygen sensor, you can use the YOUCANIC Full System Scanner to clear the stored codes. This scanner can read and clear fault codes through every vehicle’s control module.

We hope you find the Kia Optima Oxygen Sensor Replacement DIY guide helpful. Check these troubleshooting and repair guides for more help on your Kia.

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