How to Replace Kia O2 Oxygen Sensor

In this guide, you will find step-by-step instructions on how to change the oxygen sensor on Kia vehicles.


When the oxygen sensor fails on your Kia, you may notice one or all of the following issues:

  • Check Engine Light is ON
  • A decrease in fuel economy
  • Engine hesitation or misfire
  • Rough engine idle

Getting started

Before you start replacing the oxygen sensor, we need to identify which oxygen sensor needs to be replaced.

On 2.0T and 2.4 L four-cylinder Kia engines, there are two oxygen sensors. One is upstream of the catalytic converter, and one is downstream.

In the following tutorial, we will show you how to replace the upstream sensor (Bank 1 Sensor 1). The procedure is the same for the downstream O2 sensor (Bank 1 Sensor 2). For the downstream sensor, you will find it easier to access the O2 sensor by getting under the car. 

What you will need

How to Change Kia O2 Oxygen Sensor

  1. Start by turning off the ignition. Next, open the hood. We recommend disconnecting the negative battery terminal. 
  2. Locate the upstream oxygen sensor Bank 1 Sensor o2 sensor replacement kia rio soul sportage optima rio rondo borrego
  3. Disconnect the oxygen sensor electrical wire. kia oxygen sensor replacement
  4. Remove the oxygen sensor using an oxygen sensor socket. To remove the sensor, you need to turn the ratchet counter-clockwise. The old sensor may be stuck. If so, use penetrating fluid to loosen up the stuck sensor.  
  5. Install the new oxygen sensor on your Kia. replacement guide oxygen sensor diy with pictures video
  6. Using a Kia OEM oxygen sensor, you can plug the new sensor directly into the electrical socket. If you are using a universal O2 sensor, you will need to splice and connect the wires.

Owners of Kia Forte, Optima, Rio, Sorento, Soul, Sportage, Sedona, Soul, Borrego will find this guide helpful.

The pictures below were taken on a 2016 Kia Optima equipped with the 2.4L Theta II engine, which is the same engine used in other Kia models and Hyundai Sonata as well.

Torque Specifications

  • Oxygen Sensor: 45 ~ 49 N.m (30 ~ 35 lb-ft)

Fault Codes

This is a list of fault codes related to oxygen sensors. Note that the oxygen sensor may not always be the problem. You may have other problems such as a bad wiring harness, for example. You can read these codes yourself using an OBD-II code reader and clear them once you complete the repair.

Here is a partial list of Oxygen Sensor related fault codes.

P0130 O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
P0131 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
P0132 O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
P0133 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
P0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
P0135 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0136 O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)
P0137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
P0138 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
P0139 O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
P0140 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
* There may be other codes that point to a bad Oxygen Sensor.


HO2S [Bank 1/Sensor 1]

Item Specification
Heater Resistance (?) 2.5 ~ 4.0 [20?C(68?F)]

HO2S [Bank 1/Sensor 2]

A/F Ratio (?) Output Voltage(V)
RICH Approx. 0.9
LEAN Approx. 0.04
Item Specification
Heater Resistance (?) 3.3 ~ 4.1 [21 C(69.8 F)]

Source: Kiopman



Visitor, December 30, 2016
If I were to go to Auto zone to get these tools myself for the OEM, what tools would I ask for? Trying to replace 2013 Kia Soul 4cyl both o2 sensors. Thanks!
Visitor, December 30, 2016
So, I replaced both O2 sensors on my 06 Spectra. But after about 2 weeks, I got the same error. Sensor 2. What do you all recommend I do?
Visitor, December 30, 2016
Hey You wouldn't need anything accept for the above mentioned tools and a simple screwdriver
Visitor, December 30, 2016
where is the upstream O2 sensor on a 2009 Kia Sedona?
Visitor, December 30, 2016
I got a 2002 Kia Sportage 4x4 downstream 02 sensor po141 keeps coming back put two new 02 sensor in same thing want is the problem
Visitor, December 30, 2016
I was quoted $230 for replacing the O2 sensor in my optima. It was so easy to replace following this guide. Thanks a lot.
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