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P1104 is a diagnostic trouble code (DTC) for "Mass Airflow Sensor Ground Malfunction". 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.
A vehicle Powertrain Control Module (PCM) can store a P1104 trouble code when the system encounters an erratic voltage signal from the Mass Air Flow (MAF) circuit. In addition to a P1104 trouble code, other codes that are commonly stored in conjunction with the code include a P1100, P1101, P1102, and P1103 code.
A P1104 trouble code means that the MAF sensor is sending an erratic voltage to the PCM. This erratic behavior results in the storage of a P1104 trouble and the illumination of the check engine light.
The causes of a P1104 trouble code can range from a bad MAF sensor, a short within the MAF sensor wiring harness, or simply a loose connection at the MAF sensor. Some other causes of this problem include a dirty or clogged air filter that reduces flow of air to the MAF sensor, the vane of the MAF contaminated with debris, a leak in the vehicle's vacuum system either before or after the MAF sensor, and a faulty PCM.
Some common symptoms of a P1104 trouble code includes erratic operation by the engine, a high idle, backfiring by the engine, and reduced engine power when accelerating. The conditions that lead to the storage of this code can also cause internal engine damage if left untreated.
When diagnosing a P1104 trouble code, a mechanic needs an OBD-II code scanner, a digital volt/ohm meter, and an evaporative smoke tester. The mechanic must also take the following steps:
Mechanics treating a P1104 trouble code commonly make the mistake of replacing the MAF sensor without checking the wiring for fault, damage, or looseness beforehand, which turns out to be the problem. The result is that the repair does not fix the problem and the code returns upon clearing. In addition, mechanics should replace a dirty air filter and clean the MAF sensor before attempting part replacement.
While the problems associated with a P1104 trouble code usually do not prevent the vehicle from operating, the resulting reduction in vehicle performance can lead to difficulty when operating the vehicle. In addition, the possible damage to internal engine components means you should have this trouble code diagnosed and fixed as soon as possible.
To successfully repair a P1104 trouble code, the mechanic should perform the following:
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