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P1102 is a diagnostic trouble code (DTC) for "Mass Airflow Sensor in Range But Lower Than Expected". 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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
When the voltage coming from the Mass Air Flow (MAF) sensor to the Powertrain Control Module (PCM) is low but within range, a P1102 trouble code is stored. Other trouble codes related to this code include a P1100, P1101, P1103, and P1104 code.
The MAF sensor communicates with the PCM using voltage. When this voltage registers as lower than normal, but still falls within the manufacturer's specified range, a P1102 trouble code is stored by the PCM and the check engine light illuminates.
Some possible causes of a P1102 trouble code includes shorted wiring or a loose connection within the MAF sensor harness, an air leak in the vacuum system before or after the sensor, or a bad or dirty MAF sensor. A clogged MAF sensor screen can also cause the voltage from the MAF sensor to register as too low. In some cases, the problem is caused by a poor electrical connection with the MAF sensor circuit.
Some of the more common symptoms of a P1102 trouble code storage include an erratically running engine, less power when accelerating, and stalling while idling. Another problem caused by a P1102 trouble code is problems with the fuel mixture, which can lead to problems with the vehicle's engine.
Diagnosing a P1102 trouble code requires the use of an advanced scanner and a digital volt/ohm meter by the mechanic. In addition, the mechanic should perform the following diagnostic steps:
Mechanics often make the mistake of replacing the MAF sensor without trying to see if cleaning it with a CRC 05110 spray cleaner works first. Often, cleaning the sensor can lead to it operating properly and not require the expense of purchasing a replacement part. Also, the mechanic should try replacing the air filter before replacing the MAF sensor.
The problems often associated with the storage of a P1102 trouble code means that you should have the code diagnosed and fixed as soon as possible. In addition to the rough operation, stalling, and reduced fuel efficiency issues, allowing this code to continue without repairing can lead to internal engine damage over time.
To repair a P1102 trouble code, the mechanic must perform the following steps:
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