Introduction
The P1128 code is a generic OBD-II diagnostic trouble code that indicates a problem with the intake air temperature (IAT) sensor circuit. The IAT sensor measures the temperature of the air entering the engine, and this information is used by the engine computer to adjust the air-fuel ratio and timing. A faulty IAT sensor can cause a variety of problems, including poor engine performance, increased emissions, and decreased fuel economy.
Understanding the IAT Sensor Circuit
The IAT sensor is a thermistor, which is a type of resistor that changes its resistance in response to changes in temperature. The IAT sensor is typically located in the intake manifold, and it is connected to the engine computer by a two-wire circuit. The engine computer supplies a reference voltage to the IAT sensor, and the sensor’s resistance determines the amount of current that flows through the circuit. The engine computer uses the current flow to calculate the temperature of the intake air.
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Symptoms of a Faulty IAT Sensor
The symptoms of a faulty IAT sensor can vary depending on the severity of the problem. Some common symptoms include:
• Poor engine performance
• Increased emissions
• Decreased fuel economy
• Stalling
• Hard starting
• Check Engine Light
Diagnosing a P1128 Code
If you are experiencing any of the symptoms listed above, it is important to have your vehicle diagnosed by a qualified technician. The technician will use a scan tool to read the diagnostic trouble codes stored in the engine computer. If the P1128 code is present, the technician will begin by inspecting the IAT sensor and its circuit. The technician may also test the sensor using a multimeter to verify that it is functioning properly.
Fixing a P1128 Code
If the IAT sensor or its circuit is found to be faulty, the technician will need to replace the defective component. In some cases, the technician may also need to update the engine computer’s software to ensure that it is compatible with the new sensor.
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How To Fix P1128 Code
Preventing P1128 Codes
There are a few things you can do to help prevent P1128 codes from occurring in the future:
• Keep your vehicle’s air filter clean
• Avoid driving in dusty or sandy conditions
• Have your vehicle’s engine regularly inspected and serviced
By following these tips, you can help keep your vehicle running smoothly and efficiently for many years to come.
