Check your car when install new sensor;Please notice Flow Sensor feared dust and dirty;So when install sensor please make old housing and intake filter are clean;Also check intake pipe leak or not , it will influence engine working abnormal;MAF sensor error code :P0100,P0101,P0102,P0103,P0104After receiving the goods,the car is not working properly:1.Please use the ECU or car diagnostic equipment to check if the car has an error code. If there is an error code, please reset the error code first. If you don't have an ECU and a car diagnostic device,I recommend driving the car to a service center to detect the error code that exists in the reset car.(2) The car meter shows that the engine light is on, only solution:use the diagnostic device to reset the car fault code,it will eliminate this fault.Applications:For D21 2.4L 2389CC l4 GAS SOHC Naturally Aspirated 1993For D21 2.4L 2389CC l4 GAS SOHC Naturally Aspirated 1992For D21 2.4L 2389CC l4 GAS SOHC Naturally Aspirated 1991For D21 2.4L 2389CC l4 GAS SOHC Naturally Aspirated 1990For Sentra 1.6L 1597CC 97Cu. In. l4 GAS DOHC Naturally Aspirated 1994For Sentra 1.6L 1597CC l4 GAS Naturally Aspirated 1993For Sentra 1.6L 1597CC 97Cu. In. l4 GAS DOHC Naturally Aspirated 1993For Sentra 1.6L 1597CC l4 GAS Naturally Aspirated 1992For Sentra 1.6L 1597CC 97Cu. In. l4 GAS DOHC Naturally Aspirated 1992For Sentra 1.6L 1597CC l4 GAS Naturally Aspirated 1991For Sentra 1.6L 1597CC 97Cu. In. l4 GAS DOHC Naturally Aspirated 1991For 100NX 1.6L 1990, 1991, 1992, 1993, 1994For 100NX (B13) 1.6L Petrol 1990-1994 (ENGINE CODE GA14DS)For Sunny 1.4L 1990, 1991, 1992, 1993, 1994, 1995For Sunny III (N14) 1.4i Petrol 1990-1995 (ENGINE CODE GA14DE)For III (N14) 1.4i Petrol 1990-1995 (ENGINE CODE GA14DS)colour:blackMaterial:plasticPackage Contents:1 * flow meterOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.