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P1103 is a diagnostic trouble code (DTC) for "Mass Airflow Sensor in Range But Higher 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.
The Powertrain Control Module (PCM) stores a P1103 trouble code when the voltage signal from the Mass Air Flow (MAF) sensor is higher than normal but still falls within the range specified by the manufacturer. In addition to a P1103 trouble code, other related codes the PCM might store include a P1100, P1101, P1102, and P1104 code.
The MAF sensor sends data to the PCM in the form of a voltage signal. If the PCM receives a voltage signal from the MAF sensor that is higher than what the manufacturer has specified but the signal still falls within established parameters, a P1103 trouble code is stored and the check engine light illuminates.
A common cause of a P1103 trouble code is faulty or loose wiring and connectors within the MAF sensor wiring harness. In addition to this, a leak in the vacuum system, either before or after the MAF sensor, can cause the PCM to store this code. A clogged MAF sensor screen or a dirty or bad MAF sensor are some other likely causes of a code storage.
Symptoms of a P1103 trouble code include stalling when idling, an erratically running engine, and reduced power while accelerating. In addition, a vehicle can suffer from reduced fuel efficiency from the conditions that cause a P1103 trouble code.
To diagnose the P1103 trouble code, a mechanic needs to use an advanced scanner, an evaporative smoke tester, and a digital volt/ohm meter. Once the mechanic has the necessary equipment, they need to perform the following steps:
A mistake common to P1103 trouble code diagnosing is for the mechanic to replace the MAF sensor without checking the wiring for fault, damage, or looseness. The result is that the problem is not fixed and the code returns.
While a vehicle can still operate with a P1103 trouble code stored, the erratic running condition of the engine and the subsequent stalling while idling can make the vehicle difficult to drive. The reduced fuel efficiency also leads to more costs when putting fuel into the vehicle. Because of this, it is recommended that you deal with a P1103 trouble code as soon as possible.
Repairing a P1103 trouble code requires a mechanic to do the following:
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