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P1101 is a diagnostic trouble code (DTC) for "Mass Airflow Sensor Out of Self Test Range". 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 storage of a P1101 trouble code happens when the Powertrain Control Module (PCM) detects a fault within the Mass Air Flow (MAF) sensor system. Related codes that the PCM might store along with a P1101 trouble code includes a P1001, P1100, P1102, P1103, P1104, and P1105 code.
When a P1101 trouble code is stored, it means that the PCM detected a discrepancy with the voltage from the MAF sensor. This problem can be detected while the PCM is running a self diagnostic called a Key On Engine Running (KOER) test. When the voltage from the MAF sensor is greater or lesser than the voltage allowed by the manufacturer, the test fails.
Some of the possible causes of a P1101 trouble code include a faulty MAF sensor, faulty connectors or wiring within the MAF sensor harness, and an air leak either before or after the MAF sensor. A poor electrical connection within the MAF sensor circuit can also cause the storage of this code.
In addition to the code storage and the subsequent illumination of the check engine light, symptoms of a P1101 trouble code include poor engine performance exhibited in erratic performance upon startup, rough idling, and reduced vehicle power while in operation. In addition, a vehicle with a stored P1101 trouble code can also experience a reduction in fuel economy.
To diagnose a P1101 trouble code, a mechanic needs to use an OBD-II scanner and a digital volt/ohm meter. In addition, the mechanic should perform the following steps:
Mechanics often make the mistake of replacing the MAF sensor when simply cleaning it would have corrected the problem and cleared the P1101 trouble code. Another common mistake is to not check for vacuum leaks, which leads to the persistence of the code.
While a P1101 trouble code usually does not prevent the operation of a vehicle, it can cause the engine to run roughly, lose power, and even consume more fuel. This code should be repaired as soon as possible, because prolonged driving with this code stored can lead to internal engine problems.
To repair and successfully clear a P1101 trouble code, a mechanic must complete the following steps:
When removing the MAF sensor for cleaning, the mechanic should take care to not damage the wiring. The wiring that connects to the MAF sensor is very delicate and easily damaged.
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