Air & Fuel Mixture ControlOBD2 Codes

P0150 – Meaning, Causes, Symptoms, & Fixes

Reading Time: 2 minutes


Code P0150 Definition

O2 Sensor Circuit Malfunction (Bank 2, Sensor 1)

 What Does P0150 Mean?

The P0150 code is triggered when the Engine Control Module (ECM) fails to properly detect activity from the O2 sensor. The O2 sensor transmits a voltage in relation to the amount of oxygen in the exhaust. This voltage is indicated by a value typically between .1 to .9 volts. The value of .1 means the engine is “running lean” and has too much air and not enough fuel. The value of .9 means the engine is “running rich” and has too much fuel and not enough air causing it to run hotter than usual. If the ECM detects that the oxygen sensor is reporting outside of the normal range, this will trigger the P0150 code and eventually affect your fuel economy.

What Are the Symptoms of Code P0150?

  • Check engine light
  • Lower fuel economy
  • Excessive smoke from exhaust
  • Engine stalls/ runs

*No noticeable adverse conditions in some cases

What Is the Cause of Code P0150?

  • Detected voltages not within normal range
  • Exhaust leaks in front of sensor
  • Open or short in circuit
  • Corrosion/damaged O2 Sensor connector
  • Frayed wiring/connection to O2 sensor
  • Intake vacuum air leaks
  • Faulty O2 sensor

What Is the Severity of Code P0150? -Low

This trouble code will not prevent your vehicle from running. The most common result(s) are decreased fuel economy and fuel volatility. However, if left unsolved, this code could eventually damage your car’s engine, and cause your engine to fail emissions tests.

Code P0150 Common Diagnosis Mistakes

Prematurely replacing the O2 sensor before checking visually for any faulty wiring or any exhaust leaks that could be causing the sensor to report false readings.

Tools Needed to Diagnose Code P0150:

How to Diagnose Code P0150:

  1. Check to see if there are any other codes along with P0150 and clear your Check Engine Light with FIXD.
  2. Check the freeze frame data in order to pinpoint the issue.
  3. Conduct a visual inspection of wiring around the O2 sensor for fraying or disconnection.
  4. If the problem persists, consider replacing the O2 sensor.


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  1. I have a code p0138 which 02 sensor is it

    1. Hey Arthur! Here is a link to our article on code P0138. It will give you a good idea about where the O2 sensor is and what the code means for your vehicle.

      Thanks, FIXD Team

  2. Where can I find the O2 sensor in my 2010 F150?

    1. 02 sencors are located on the top side of each front wheel well before and after the catalytic converter( both left and right front wheel wells) 2010 F150

  3. where can I locate my po150 on my 2009 f150 sl

  4. I have a 1998 Mercedes Benz CLK 320 and ran a diagnostic scan. It says I have a 02 sensor circuit bank 2 sensor 1 and a 02 sensor heater circuit bank 2 sensor 1 error code. My first question is, are those two error codes the same sensor errors? Also I noticed this article says to “Check the freeze frame data in order to pinpoint the issue.” What would I need to look for to know if it is truly the sensor failing or another issue all together?

  5. Where is the O2 sensor located on a 2002 Toyota Sequoia, code read O2 sensor circuit malfunction (Bank 2, sensor 1)

  6. Can you tell me where the O2 sensor (bank2 sensor1) is located on a 2011 Ford Taurus 6 cyl. 3.5 liter?

  7. I have a 2006 Nissan xterra. Where’s the o2 sensor located on my vehicle. (Bank2, sensor 1) Now, is there a specific spot to find this one?

  8. I have a 2006 Nissan xterra. Where’s the o2 sensor located on my vehicle. (Bank2, sensor 1) Now, is there a specific spot to find this one?

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