Mitsubishi Oxygen Sensor Replacement

Vehicle:   Mitsubishi
Difficulty: ⚫⚫⚫⚪⚪
DIY Cost: $40-$120
Est. Time: 1-2 hr

In this guide, you will find instructions on how to change the upstream oxygen sensor (Bank 1 Sensor 1, B1S1) on a Mitsubishi vehicle. 

The pictures on this guide are from a 2019 Mitsubishi Outlander with the 4 cylinder engine. The same engine is used on Mitsubishi Lancer, Eclipse and other models therefore the procedure is the same for all models equipped with the 2.4L four-cylinder engine. 

Symptoms

Symptoms you may notice that are often caused by a bad oxygen sensor. 

  • Check engine light stays on
  • A decrease in fuel economy
  • Rough idle
  • Poor acceleration
  • Can not pass the smog test

What you will need

How to Change Mitsubishi Oxygen Sensor

Follow these steps to change the oxygen sensor on a Mitsubishi. The steps below are for bank 1 sensor 1 which is the upstream sensor. 

  1. Park the vehicle, turn off the engine, and let it cool down. 
  2. Pull the hood release and open the hood. Mitsubishi engine getting read to change oxygen sensor
  3. Use a 7/8 oxygen sensor socket and ratchet wrench to break loose the oxygen sensor. remove mitsubishi oxygen sensor
  4. Unplug the electrical connector. mitsubishi check engine light on
  5. Remove the oxygen sensor wire from the clips. replace mitsubishi oxygen sensor

     

  6. Use the oxygen sensor socket to completely remove the oxygen sensor. remove mitsubishi oxygen sensor
  7. Install the new oxygen sensor in reverse order. 
  8. Connect the electrical connector until you hear it click in place. 
  9. Start the engine. The check engine light may take a few days to reset. 

If the check engine light does not turn off, follow this guide to learn how to diagnose the Mitsubishi check engine light.

A similar procedure can be carried to change the downstream oxygen sensor (Bank 1 Sensor 2). B1S2 is easier to reach by lifting up the vehicle and reaching it from underneath. 

Related Codes

The following codes are often related to a faulty oxygen sensor.  A diagnostic must be performed to verify that the oxygen sensor is faulty. Reading codes with an OBD-II scanner can help you narrow down the problem. 

P0150 O2 Sensor Circuit Malfunction Bank 2 Sensor 1
P0151 O2 Sensor Circuit Low Voltage Bank 2 Sensor 1
P0152 O2 Sensor Circuit High Voltage Bank 2 Sensor 1
P0153 O2 Sensor Circuit Slow Response Bank 2 Sensor 1
P0154 O2 Sensor Circuit No Activity Detected Bank 2 Sensor 1
P0155 O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 1
P0156 O2 Sensor Circuit Sensor Malfunction Bank 2 Sensor 2
P0157 O2 Sensor Circuit Low Voltage Bank 2 Sensor 2
P0158 O2 Sensor Circuit High Voltage Bank 2 Sensor 2
P0159 O2 Sensor Circuit Slow Response Bank 2 Sensor 2
P0160 O2 Sensor Circuit No Activity Detected Bank 2 Sensor 2
P0161 O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 2
P0162 O2 Sensor Circuit Malfunction Bank 2 Sensor 3
P0163 O2 Sensor Circuit Low Voltage Bank 2 Sensor 3
P0164 O2 Sensor Circuit High Voltage Bank 2 Sensor 3
P0165 O2 Sensor Circuit Slow Response Bank 2 Sensor 3
P0166 O2 Sensor Circuit No Activity Detected Bank 2 Sensor 3
P0167 O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 3
P0170 Fuel Trim Malfunction Bank 1
P0171 System Too Lean Bank 1
P0172 System Too Rich Bank 1
P0173 Fuel Trim Malfunction Bank 2
P0174 System Too Lean Bank 2
P0175 System Too Rich Bank 2
By YOUCANIC Automotive Experts
Oct 2020
Mitsubishi Oxygen Sensor Replacement In this guide, you will find instructions on how to change the upstream oxygen sensor (Bank 1 Sensor 1, B1S1) on a Mitsubishi vehicle.