This would be particularly noticeable at idle. Some other symptoms could be engine not operating as normal, and even some sputtering conditions occurring. One symptom will be the check engine light on the dashboard which will accompany this fault code being set. The engine controller will also use the MAF for many other reasons to determine correct set point for much of the remaining parts of the engine was well, such as determining the optimized spark timing or EGR valve position. This could be the scenario if the MAF is reading lower than the actual mass flow rate of air to the engine. This is dangerous for gasoline engines for many reasons, one of which could be deactivation of the 3-way catalyst. One of the main ways that the engine controller uses that information is to determine the amount of fuel that enters the engine.įor gasoline engines, it is important to operate near stoichiometric ratio of air to fuel for combustion.Ī MAF that is reading too low will then result in not enough fuel being injected, and as a result the engine would be operating in a lean condition. The MAF sensor is used to measure the amount of air entering the engine. P0102 is an OBDII trouble code indicating that the mass air flow sensor (MAF) is reporting inaccurate values.
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