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P1112 is a diagnostic trouble code (DTC) for "Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
A P1112 trouble code is related to a vehicle’s intake air temperature sensor that measures the air entering the engine to adjust the fuel and cooling system in order to maintain a normal operating temperature threshold.
P1112 is a OBD-II manufacturer-specific code for a voltage issue regarding the signal sent to the engine computer from the intake air temperature (IAT) sensor. The sensor contains a semiconductor device that changes resistance based on air temperatures coming into the intake manifold. The computer monitors voltage changes from the resistance of the sensor, and if the temperature is too high, the voltage signal will drop below the manufacturer’s threshold and trigger a P1112.
The most common causes for a P1112 are:
Symptoms of a bad or failing intake air temperature sensor range from a lack of power, trouble with cold starts, and decreased fuel economy. However, some P1112 codes may result in no noticeable symptoms other than a check engine light.
Before troubleshooting with a OBD-II scanner, your mechanic will visually inspect the sensor and associated wiring, looking for any obvious damages. If the sensor and wiring are intact, they will then connect the scanner to the vehicle and monitor the reading from the IAT. At cold start, it should roughly match the coolant reading. Your mechanic will need to test drive the vehicle to get it up to operating temperature and ensure the IAT reading is indeed too high (low voltage).
Because all P1XXX codes are manufacturer specific, it’s critical to have any code read by a professional-grade OBD-II scanner to ensure you’re fixing the correct problem. For example, a P1112 code in a Fiat is for the control fuel pressure system and one for a Daewoo is for the MAP sensor.
A faulty IAT sensor can cause a variety of unsavory driving characteristics, making it fairly serious for you to correct a P1112 as quickly as possible.
The most common repairs for a P1112 are as follows:
All P1112 codes that deal with the intake air temperature sensor are for Acura, Citroen/Peugeot, Ford, General Motors, Isuzu, Jaguar, Mazda, and Mercedes vehicles.
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