Air & Fuel Mixture ControlOBD2 Codes

P0102 – Meaning, Causes, Symptoms, & Fixes

What Does Code P0102 Mean?

  • P0102 definition: Mass or Circuit Airflow (MAF) Circuit Low Voltage Input
  • 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 P0102 code. This DTC can be triggered by a clogged or faulty MAF sensor, corroded/damaged wiring, or even a dirty air filter.

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The Mass Airflow (MAF) sensor measures the amount of air entering the engine. When code P0102 is set, there is a low voltage output to the ECM, PCM, or ECU depending on your car type (check your owner’s manual for your specific car).

P0102 Causes

  • Dirty air filter
  • Faulty MAF sensor
  • Corroded/Damaged MAF circuit terminals
  • Carbon covered MAF sensor screens

P0102 Symptoms

  • Check Engine Light
  • Less power to the engine
  • Low fuel consumption – causing engine damage

How Do I Fix Code P0102?

With a P0102 code, the first step is to get it properly diagnosed to figure out what is causing the malfunction in the MAF circuit. Using the live data function of the FIXD sensor and app allows you to read and analyze engine data to properly diagnose a P0102 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 P0102?

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 P0102 code.

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Possible Repair Costs for P0102

When it comes to making repairs associated with the P0102code, 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. 

  • MAF sensor: $
  • MAF wiring repair: $
  • Air filter: $

DIY Steps to Diagnose Code P0102

If you’d like to try to fix code P0102 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.


Check your air filter and replace, if needed.


The quickest way to check if your Mass Air Flow (MAF) sensor is the problem is to disconnect your electrical harness while your car is running. Check your owner’s manual to locate the MAF sensor for your specific car. NOTE: Make sure that all other parts of your vehicle have cooled down (6-8 hours inactive) before doing this test.

If your car’s engine shuts off, your MAF sensor is operating normally, so you should check the wiring and connectors. If the engine does not shut off, the MAF sensor is not operating normally. Remove and inspect the MAF sensor, and clean it properly if there is evidence of carbon build up. If the MAF sensor still isn’t operating properly after being cleaned, it is likely that the MAF sensor needs to be replaced. 


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

Common P0102 diagnosis mistakes

Replacing the MAF sensor without inspecting the wiring and air filter first.

Still Need Help Fixing Code P0102?

If you’ve followed the steps above and are still experiencing issues with the mass air flow system and code P0102, 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. This is a shade tree mechanics best friend when it comes to diagnosing the cause of the check engine light.

  2. mine is a 2000 F150 5.4 custom 1956 IH, COE with a Ron Francis wiring harness. this tool is giving me hope for a engine light FIX.
    Very interesting. and Thanks for your fallow up.

    1. This was very helpful. I followed the instructions and learned that the maf needs to be replaced

      1. Awesome to hear, Thomas! 🙂

  3. FIX continues to evolve in all the right directions. I love the follow up explanations and suggestions. It’s so much more than a code reader!

    1. Thank you so much Kim! We appreciate it!

      FIXD Team

    2. On my mad I unplugged to put the top cover on the relay cover and forget to plug it. Back up lol

  4. I do you like this webpage it does help a lot by understanding what is the issue with my car without going to a mechanic right away and then to find out it’s something as simple as a sensor that I can replace myself thanks for having this page helps a lot

  5. Basically needed to state I am thankful that i came on the site!

  6. I have been using my FIXD sensor for 3 months now, and its saved me alot of money haha

  7. My 2008 Ford Focus will idle but very rough when I unplug the MAF sensor. It will also backfire but it will continue to run. I thought the vehicle should shutoff with the MAF sensor unplugged. I replaced the MAF sensor and also replaced the Idle Position Sensor and Crank Sensor. A side note is the Serpentine Belt is still off the vehicle so not sure if that anything to do with my issue. Error Codes are P0113, P0122, P0102. Thanks in advance for any helpful advice.

  8. My engine light come on and turns off on it’s own but it keeps throwing that code I don’t know it is completely that. Does anyone else have a suggestion?

  9. Went to pep boys and showed the parts manger my fixd app and he knew i knew what i was talking about

    1. So glad to hear it, Thomas! Thank you so much for the kind words and for using FIXD!

  10. First of all, I”d like to say thank you to FIXD for having this forum. I don’t know if we all can get our questions answered but I think it’s worth trying. So, here’s the problem with my ’05 Subaru Forester X. It throws PO102 code and I quickly replaced the sensor but it didn’t fix it..instead it throws another code PO112. So, now it has 2 codes. Well, I put the old sensor back on and tested it again to see if the sensor would give me the same codes. But no, the old sensor still throws only po102 code. I’m really confused what’s going on here. The connector is not an original connector (the original broke) I replaced it with cheap one from eBay, maybe this is why it’s giving me the code(s). Any other ideas guys? Thank you.

  11. Will a bad mass airflow sensor cause car not to turn over

    1. Hey Cedric, a faulty MAF sensor can prevent the engine from firing and starting, but not cranking. Here’s an article about the MAF and how to clean it that may be helpful:

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