P1103 Code failures by brands



Description of DTC code P1103

The MAF (Mass Air Flow Sensor) is a device that sends a voltage signal to the PCM (Powertrain Control Module). This device calculates the amount of flow entering the engine.  The engine computer (PCM) uses this data to balance the fuel mixture so that when the fuel mixture is delivered, it may be correct.

This sensor is usually located between the intake manifold and the air filter. Although it can be found in the intake manifold in different vehicle models. Regardless of the location of this sensor on your vehicle, it measures the amount entering the engine. If the PCM receives a voltage signal from the MAF sensor that turns out to be higher than expected, the P1103 OBDII diagnostic code will be set even though it is still within the levels set by the manufacturer.

Symptoms of fault code P1103

  • Check Engine light ON.
  • The engine stops at idle.
  • Engine power is reduced and becomes more noticeable during acceleration.
  • Lower fuel efficiency.

Causes of OBD2 P1103

Reasons to set P1103 OBD2 fault code:

  • The Mass Air Flow Sensor circuit may have damage to the connectors or wiring.
  • The vacuum system may be leaking, near the MAF Sensor.
  • The Mass Air Flow Sensor may have been polluted or the sensor screen may be clogged.
  • The MAF sensor may be faulty.

Possible solutions of the DTC code P1103

Steps to solve the DTC P1103 OBDII code:

  • First, consult the TSBs provided by the manufacturer.
  • Check the condition of the cables, connectors, and other electrical components that are related to the Mass Air Flow Sensor. If you discover damage from corrosion, wear, or burns, make the necessary repairs.
  • Uninstall the air filter, and perform a thorough inspection of the air filter to check for any damage that may prevent it from performing properly. Replace it if necessary.
  • Verify that the MAF Sensor does not present elements that contaminate it. In this case, perform the proper maintenance by cleaning it carefully.
  • Use an evaporative smoke tester, and check the vacuum system for leaks. Make any necessary corrections.
  • Perform some voltage checks to the MAF sensor with a DVOM to verify that the ground and power signal is as indicated by the manufacturer in its specifications. Likewise, you need to check the continuity between the sensor circuit and the PCM. Repair if the actual values are not as indicated in the manual.
  • If after performing the checks mentioned in this article you still get the P1103 OBD2 code, check the integrity of the MAF Sensor. If you determine that it is faulty, replace it.

Codes related to P1103

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