Air & Fuel Mixture ControlOBD2 Codes

P0150 – Meaning, Causes, Symptoms, & Fixes

What Does Code P0150 Mean?

  • P0150 definition: O2 Sensor Circuit Malfunction (Bank 2, Sensor 1)
  • Issue Severity: LOW – Continued driving for a short period of time is okay
  • Repair Urgency: Get this code fixed within the next month.
  • Diagnosis: It is important to complete the entire diagnostic process when diagnosing the P0150 code. This DTC can be triggered by a faulty oxygen sensor and/or wiring.

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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.

P0150 Causes

  • 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

P0150 Symptoms*

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

*No noticeable adverse conditions in some cases

How Do I Fix Code P0150?

With a P0150 code, the first step is to get it properly diagnosed to figure out what is causing the malfunction in the downstream oxygen sensor system. Using the live data function of the FIXD sensor and app allows you to read and analyze engine data to properly diagnose a P0150 code.

If the sensors are all reading correctly and you’re not comfortable further diagnosing this issue at home, we recommend finding a RepairPal-certified shop to pinpoint the problem and give an accurate estimate for repairs. 

These shops can not only help you figure out what’s going wrong before you waste time and money on the wrong parts, but they also offer a minimum 12-month, 12,000-mile warranty and stand behind all their estimates with guaranteed fair pricing.

> Find a RepairPal Certified Shop Near You

How Much Does It Cost to Fix Code P0150?

If you take your car to a shop for diagnosis, most shops will start with an hour of “diag time” (the time spent in labor diagnosing your specific issue). Depending on the shop’s labor rate, this typically costs somewhere between $75-$150. Many, if not most, shops will apply this diagnosis fee to any required repairs if you have them perform the repairs for you. From there, a shop will be able to give you an accurate estimate for repairs to fix your P0150 code.

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  • Minimum 12-month, 12,000-mile warranty
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Possible Repair Costs for P0150

When it comes to making repairs associated with the P0150 code, one or more of the below repairs may be needed to solve the underlying issue. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair. 

  • Oxygen sensor: $200-$300
  • Catalytic converter: $400-$2400
  • A leak in exhaust: $100-$200 (if welded to repair)

DIY Steps to Diagnose Code P0150

If you’d like to try to fix code P0150 at home without throwing money at parts, you’ll want to follow the steps below for proper diagnosis. Complete diagnosis may require some specialized equipment beyond what the FIXD Sensor can provide, but the biggest challenge for this repair is that internal engine issues could be the root cause of this code. As such, this diagnosis and repair should not be attempted by beginner DIYers. 

DIY difficulty level: Beginner

This repair can be attempted by beginner DIYers.

Tools/parts needed (our top picks from Amazon):


Scan your vehicle to verify P0150 is the only code present. If other codes are present, they must be addressed first.


Visually check the electrical connections, wire harness, and metal tabs in terminals for any damages. If any damage is found, replace the oxygen sensor.


Conduct a visual inspection of wiring around the O2 sensor for fraying or disconnection, and repair as necessary.


If at this point the vehicle is still setting the same code, you may have a more serious problem with your car’s oxygen sensor system, and you should bring the vehicle to a certified shop to have further diagnostic work performed.  

Common P0150 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.

Still Need Help Fixing Code P0150?

If you’ve followed the steps above and are still experiencing issues with the oxygen sensor system and code P0150, please contact the FIXD Mechanic Hotline if you’re a FIXD Premium subscriber or find a RepairPal certified shop near you to get the right repairs at a fair price.


Lifelong automotive enthusiast with a soft spot for offroading. Wrencher turned writer, but I still love to tinker on just about anything with an engine. Dream car: tie between a ‘71 Hemi ‘Cuda and a ’91 GMC Syclone. #GirlDad #SaveTheManuals

Jeffrey N. Ross
Lifelong automotive enthusiast with a soft spot for offroading. Wrencher turned writer, but I still love to tinker on just about anything with an engine. Dream car: tie between a ‘71 Hemi ‘Cuda and a '91 GMC Syclone. #GirlDad #SaveTheManuals

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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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