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An on-board diagnostic or OBD-II code helps you troubleshoot possible issues in your car. But before you can take steps to resolve the underlying problem, you must first identify what the logged code means. Read on to learn all about trouble code P0110—its definition, possible triggers, and common symptoms.

What Does the P0110 Code Mean?

Diagnostic trouble code (DTC) P0110 stands for “Intake Air Temperature Sensor Circuit (Bank 1).” This error code is set when the powertrain control module (PCM) perceives that the signal from the intake air temperature (IAT) sensor circuit does not match factory specifications.

The “sensor 1” portion of the code applies to vehicles that have multiple IAT sensors. Bank 1 points to the side of the engine opposite the #1 cylinder.

obd code p0110
Code P0110 is triggered when the PCM perceives that the signal from the intake air temperature (IAT) sensor circuit does not match factory specifications.

The IAT sensor is a negative temperature coefficient (NTC) thermistor that decreases in resistance as the temperature of the sensor increases. Its purpose is to measure the temperature of the air entering the engine and provide this data to the PCM.

The information provided by the IAT sensor (along with various other sensors) is used by the PCM for fuel control and ignition timing. If the PCM detects that the signal it has received from the IAT sensor might be out of normal operating range, it will log trouble code P0110.

P0110 is a common issue among the following makes: Nissan (especially on a Nissan Maxima), Toyota, Lexus, Mercedes Benz, and Ford.

Note: The definition of code P0110 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Possible Causes of the P0110 Code?

Here are some common triggers of the error code P0110:

  • Defective IAT sensor
  • Bad mass air flow sensor (sometimes the IAT is integrated into the MAF)
  • Circuit issues
  • Faulty PCM
air temperature sensor p0110
A defective IAT sensor can cause code P0110.

What are the Common Symptoms of the P0110 Code?

You may notice the following symptoms if you drive a car that has a logged trouble code P0110:

  • Illuminated check engine light
  • Poor engine performance
  • Poor gas mileage

How to Diagnose the P0110 Code

To avoid complications, code P0110 should be resolved immediately. However, it may be difficult to pinpoint the exact cause of the problem. There are many possible triggers associated with this code.

Keep in mind that the diagnostic and repair steps for this code will vary depending on the specifications of your vehicle. As all cars are built differently, they may require varying diagnostic processes.

For instance, a P0110 code on a Toyota may be diagnosed differently from a code P0110 on a Nissan. This is why it’s important to refer to a repair manual before troubleshooting your vehicle. But if reading it has only left you confused, it might be best to leave the job to an expert.

poor gas mileage
Poor gas mileage is a common symptom of code P0110.

How to Fix the P0110 Code

The P0110 code may share similar triggers and symptoms with other DTCs. However, this does not mean it shares the same fixes. All vehicles are different, so you should always refer to your vehicle’s factory repair information before DIY-ing any repairs.

Look for confirmed solutions specific to your vehicle and consult a repair manual or repair database before attempting any fixes. If you aren’t confident in your automotive repair skills, it may be best to enlist the help of a professional.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic.

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