Mitsubishi Oxygen Sensor Replacement

oxygen sensor mitsubishi

Is your Mitsubishi engine idling rough, and check engine light is on due to a faulty oxygen sensor? Learn how to fix the problem by replacing the Oxygen Sensor of your Mitsubishi. This guide provides instructions on changing 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 a 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 a bad oxygen sensor often causes the following.

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

What you will need

Bestseller No. 1
BOXI (Set of 2) Oxygen Sensors 1 Upstream & 1 Downstream O2 Oxygen Sensors Fit for Mitsubishi Lancer...
BOXI (Set of 2) Oxygen Sensors 1 Upstream & 1 Downstream O2 Oxygen Sensors Fit for Mitsubishi Lancer…
1 Upstream + 1 Downstream Fit for Mitsubishi Lancer 2.0 2002-2006; Interchange Part Number – 234-4642 234-4739
$36.99
  • Mitsubishi Oxygen Sensor
  • 7/8 Oxygen Sensor Socket
  • Ratchet Wrench

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, 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 out to change the downstream oxygen sensor (Bank 1 Sensor 2). B1S2 is easier to reach by lifting 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.

P0150O2 Sensor Circuit MalfunctionBank 2 Sensor 1
P0151O2 Sensor Circuit Low VoltageBank 2 Sensor 1
P0152O2 Sensor Circuit High VoltageBank 2 Sensor 1
P0153O2 Sensor Circuit Slow ResponseBank 2 Sensor 1
P0154O2 Sensor Circuit No Activity DetectedBank 2 Sensor 1
P0155O2 Sensor Heater Circuit MalfunctionBank 2 Sensor 1
P0156O2 Sensor Circuit Sensor MalfunctionBank 2 Sensor 2
P0157O2 Sensor Circuit Low VoltageBank 2 Sensor 2
P0158O2 Sensor Circuit High VoltageBank 2 Sensor 2
P0159O2 Sensor Circuit Slow ResponseBank 2 Sensor 2
P0160O2 Sensor Circuit No Activity DetectedBank 2 Sensor 2
P0161O2 Sensor Heater Circuit MalfunctionBank 2 Sensor 2
P0162O2 Sensor Circuit MalfunctionBank 2 Sensor 3
P0163O2 Sensor Circuit Low VoltageBank 2 Sensor 3
P0164O2 Sensor Circuit High VoltageBank 2 Sensor 3
P0165O2 Sensor Circuit Slow ResponseBank 2 Sensor 3
P0166O2 Sensor Circuit No Activity DetectedBank 2 Sensor 3
P0167O2 Sensor Heater Circuit MalfunctionBank 2 Sensor 3
P0170Fuel Trim MalfunctionBank 1
P0171System Too LeanBank 1
P0172System Too RichBank 1
P0173Fuel Trim MalfunctionBank 2
P0174System Too LeanBank 2
P0175System Too RichBank 2

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

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