DTC Code P1112 – What does this code mean?

<ul> <li><b>Engine Light ON</b>: The 'Check Engine' or 'Service Engine Soon' warning light illuminates on the dashboard. This is often the first indication of an issue with the Intake Air Temperature Sensor. Potential causes include a faulty sensor, wiring issues, or intermittent connections.</li> <li><b>Poor Engine Performance</b>: The engine may experience rough idling, hesitation, or stalling. This can be caused by inaccurate air temperature readings leading to improper air-fuel mixture adjustments.</li> <li><b>Reduced Fuel Efficiency</b>: Inaccurate intake air temperature readings can result in inefficient fuel combustion, leading to increased fuel consumption.</li> <li><b>Difficulty Starting the Engine</b>: Intermittent sensor readings can cause issues with starting the engine, especially in varying temperature conditions.</li> </ul>

<ul><li>The Intake Air Temperature Sensor may be faulty, leading to intermittent readings.</li><li>An open or shorted harness in the Intake Air Temperature Sensor can cause erratic signals.</li><li>Poor electrical connections in the Intake Air Temperature Sensor circuit can result in intermittent data transmission.</li><li>A damaged Powertrain Control Module (PCM) might fail to process the sensor's data correctly.</li></ul>

<ul> <li><b>Initial Inspection</b>: Inspect the air filter for dirt and debris. Replace if necessary. Check the intake air temperature (IAT) sensor and its wiring for any visible damage or loose connections.</li> <li><b>Clean the Mass Air Flow Sensor</b>: Use a mass air flow sensor cleaner to clean the sensor. Ensure it is completely dry before reinstalling.</li> <li><b>Reset the Code</b>: Clear the DTC code using an OBD-II scanner. Start the vehicle and monitor the IAT readings.</li> <li><b>Monitor IAT Readings</b>: Use a scan tool to monitor the IAT sensor readings. Look for any sudden changes in the readings when the harness is wiggled or the sensor is tapped.</li> <li><b>Check for Intermittent Connections</b>: Inspect the IAT sensor harness and connector for intermittent connections. Wiggle the harness and tap the sensor while monitoring the scan tool for any changes.</li> <li><b>Test the IAT Sensor</b>: Use a multimeter to test the IAT sensor resistance. Compare the readings to the manufacturer's specifications.</li> <li><b>Replace the IAT Sensor</b>: If the IAT sensor readings are out of specification or if the code returns after cleaning and resetting, replace the IAT sensor.</li></ul>

<p>The DTC code P1112 indicates an intermittent issue with the Intake Air Temperature Sensor. This is critical as it can lead to incorrect air-fuel mixture, affecting engine performance and fuel efficiency. Immediate actions should include:</p><ul><li><b>Inspecting the sensor and its wiring for damage or loose connections.</b></li><li><b>Testing the sensor's functionality with a multimeter.</b></li><li><b>Replacing the sensor if necessary.</b></li></ul><p>Delaying repair can result in poor engine performance and increased emissions.</p>