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P0112 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


The problem codes are an essential tool for the identification of potential problems in a vehicle’s engine and system, as far as automotive diagnostics is concerned. One of these is the P0112 DTC Diagnostic Error Code, which can give you valuable information on your vehicle’s health. In this lesson, we’re going to explore exactly what P0112 is and how it affects the performance of your vehicle.


P0112 is a specific DTC with regard to the Intake Air Temperature IAT0112 sensor circuit. The IAT sensor shall be responsible for measuring the incoming air temperature in the engine. This information is required to adapt the air-fuel mixture and optimize engine performance according to operating conditions for the ECUECM, which relies on these data.


The P0112 code may be set off by a number of causes. Common reasons include, among others:

  • A malfunctioning IAT sensor may exist owing to deterioration, an electrical problem, or exposure to extremely high or low temperatures.
  • Wire Issues: Corroded or damaged wire that connects to the IAT sensor may cause false temperature readings or even total failure.
  • Connector problems: Communication between the IAT sensor and the ECM might be hampered by loose or disconnected connectors.
  • Intake Air Leaks: The accuracy of the IAT sensor can be impacted by any leaks in the intake system that let unmeasured air to reach the engine.
  • ECM Issues: The P0112 error code can occasionally be caused by the Engine Control Module itself.


There may be various observable indications when your car displays the P0112 code, such as:

  • An illuminated check engine light is one of the most glaring indications that there is a problem with your car.
  • Decreased Engine Performance: Due to an incorrect air-fuel combination, the engine may have trouble performing at its normal levels.
  • Poor Fuel Efficiency: The IAT sensor’s inaccurate readings might result in a reduction in fuel efficiency.
  • Rough Idling: The engine may display unsteady idling, making it difficult to maintain a smooth-running vehicle at a stop.


A skilled mechanic or an OBD-II scanner must use a methodical approach to identify the P0112 code’s underlying cause. The standard diagnostic procedure entails:

  • Checking for Codes: The P0112 code may be read and retrieved from the vehicle’s ECM using an OBD-II scanner.
  • Visual Inspection: To find any obvious problems, the IAT sensor, its wiring, and its connections must all be carefully inspected visually.
  • Testing the IAT Sensor: The resistance and voltage output of the sensor should be tested with a multimeter to ascertain its performance.
  • Checking for Intake Leaks: The mechanic will look for any leaks that could be impacting the readings from the IAT sensor throughout the intake system

Common mistakes

There are several frequent errors that technicians or car owners may make during diagnostics and repairs:

  • Ignoring wire and Connectors: Occasionally, the problem may be as straightforward as a loose connection or faulty wire, which is frequently disregarded.
  • Replacing the IAT Sensor without Testing: Before replacing the sensor, it is important to validate its operation rather than making assumptions.
  • Ignoring Intake Leaks: It’s important to properly inspect the whole system since intake leaks might result in misleading sensor readings.

How serious is this?

The significance of the P0112 code is dependent upon a number of factors. Although this may seem small, it can get out of hand and have a detrimental effect on your vehicle’s overall performance if not addressed. In order not to cause additional damage to the engine or related components, prompt diagnosis and repair are advised.

What repairs can fix the code?

repair manuals

The following remedies can be made if the P0112 code’s underlying cause has been found:

  • IAT Sensor Replacement: If the sensor is broken, a genuine and suitable part should be used to replace it.
  • Fixing wires and connections: If required, damaged wires or connections should be fixed or replaced.
  • Repairing Intake Leaks: To stop the admission of unmeasured air, any leaks in the intake system should be patched.

Related codes

Sometimes, other DTCs might accompany the P0112 code, providing additional insights into related issues. Commonly related codes include P0110 (IAT Sensor Circuit Malfunction) and P0111 (IAT Sensor Circuit Range/Performance Problem).


Finally, the P0112 DTC code indicates a potential problem with an intake air temperature sensor circuit. You can help to solve this problem effectively by understanding the meaning, causes, symptoms, and appropriate treatment. 

The code will not only be erased but also ensures that your vehicle operates effectively and improves the driving experience with timely diagnosis and correct repairs. In order to ensure a correct diagnosis and suitable repairs, it is recommended that qualified mechanics be consulted.

P0112 Code – What Does It Mean & How To Fix It