If the sensor doesn't measure the air flow correctly, the fuel injection system won't work properly. The engine computer uses the mass air flow sensor signal to determine how much fuel to inject. In most cases, this code is not very difficult to diagnose. The OBD-II code P0101 is set when the signal from the mass air flow sensor is out of expected range, or in other words, the MAF sensor doesn't work properly. The mass airflow sensor (MAF) measures the amount of air entering the engine. Signs of automatic transmission problems.How to check the engine when buying a used car.How to get the best deal on a used car?.Buying a Used Car: 10 Common Mistakes to Avoid.Following these steps should help in pinpointing the root cause of this failure code and performing the correct repair. Having the incorrect estimate of air going into the engine is going to impact the overall engine performance in many ways, even if they are not immediately obvious. Many engine functions are based on the reading from the MAF. The MAF is one of the most important sensors in the engine. This could be checked by using a scan tool and calculating the expected mass air flow based on engine speed and intake air temperature and compare that with the mass air flow being reported by the MAF on the scan tool. If still not resolved, the MAF sensor should be evaluated for accuracy. You can then repeat the same evaluation as performed after replacing the air filter. If the situation does not get better, remove the MAF and inspect for any type of dirt buildup. Check MAF Sensor Accuracy with Scan Tool.If you believe this may have been a cause, clear the failure codes and try to repeat conditions where this failure was previously noticed. It may take a few minutes for the condition to improve. If any amount of dirt is seen on the air filter, I would first replace this and notice if any of the previously noted symptoms still exist.įor example, if the engine would sometimes stumble at idle, replace the air filter and check if idle becomes more stable. The first step I would recommend for repair is to check the air filter. If neither of these failure codes is seen, the MAF may truly be defective. Other potential causes could be dirt or dust buildup on the MAF sensor element, which is likely to have been caused by the air filter not being cleaned frequently enough. One common cause of the P0102 error code could be a dirty air filter. There are a few different root causes to consider when this error code is seen. In the case of a marginal fault, it is possible that no adverse symptoms will be noticed. Many of the symptoms may not be detectable, depending on the severity of the fault. Catalytic Converter Not Working Properly.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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