![]() Many vehicles with mileage over 100,000 have momentary sensor problems that usually occur during start up or prolonged stress situations on the drive train. Repair or replace as necessary.Ĭheck for vacuum leaks on the intake manifold hose and fittings, especially on older cars.Īdditional comments for consideration regarding the P0102 code ![]() Thoroughly inspect for wiring being frayed, damaged, or broken on the connector. Disconnect it and then reinstall to insure fresh electrical connection to remove any corrosion on the contacts. Inspect the electrical connector to the MAF to insure it is attached correctly. If the P0102 code comes back, then it is important to follow the test procedure. ![]() Reset the fault codes and perform a road test with normal driving. The most common repairs to address the P0102 code are as follows: Often times, if the engine warning light came on immediately at start up, the OBD- II system can be reset and the vehicle will operate normally. Occasionally, if no problems are found, reset the fault codes and then retest to see if the warning light and code return. The MAF sensor issue can cause both limited and excessive fuel consumption, rough operation and difficulty starting in certain circumstances, so it is best to have a mechanic inspect it at your first opportunity. The P0102 code will generally not prevent the car from driving. The air filter may be very dirty causing the sensor to show low air flow voltage due to air flow restriction. Before buying a MAF sensor, try cleaning it with a specialized spray cleaner, like CRC 05110 made for MAF sensors, as these often get considerable carbon build up from the emission system, especially at idle. First, follow the test procedure for the wiring and sensor.ĭo not buy a MAF sensor unless the other tests indicate no problem. If no problems are noted, then the next step is to have the mechanic do a circuit test with a multimeter that has a digital display to show sampling rate and sensor range readings to determine if the MAF sensor output is really too low or there is another cause.Ĭommon mistakes when diagnosing the P0102 codeĭiagnostic errors are largely due to not following the correct procedure. If the code does comes back, the mechanic will need to do a thorough visual inspection to determine any electrical connector, wiring, sensor, air cleaner, is plugged or damaged MAF unit. He can observe this by watching it live on his scanner while driving. A qualified technician should then reset the OBD- II fault codes and road test the vehicle to see if the code returns. P0102 is diagnosed with an OBD- II scan tool. How does a mechanic diagnose the P0102 code? The vehicle may have too low of fuel consumption, which could cause internal engine problems. The engine can run near normal but it may run slightly erratically, have less power and idle inconsistently. P0102 code will be normally preceded by the Check Engine Light coming on the dashboard display. MAF sensors must operate within specific ranges to send correct signals for the ECU to adjust correctly for proper engine operation and inputs from other sensors. Many MAF units have screens and they can get clogged up easily, clean using a CRC 05110 spray cleaner. The MAF sensor can also be dirty or partially plugged with carbon causing a low reading. The wiring or MAF sensor may be too close to higher voltage consumption components, especially alternators, ignition wires, etc. The most obvious problem is restricted airflow from the air cleaner to the MAF sensor which can be a clogged air filter. The source of the problem is the sensor range voltage is lower than normal or required by the ECU to function properly. The MAF Sensor has low voltage output problems which may have several causes. P0102 is the general code for a problem with the Mass Airflow (MAF) Sensor having a low voltage output to the Engine Control Unit (ECU). The code P0102 code is often associated with P0100, P0101, P0103 or P0104 trouble codes as they are closely related.Mass Airflow (MAF) Circuit Low Voltage Input
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