Check your car when installing a new sensor; please note that air flow sensor fears dust and is dirty; Therefore, when installing the sensor, make sure the old housing and intake air filter are clean. Also check whether the intake pipe has a leak or not, this will affect the engine operation abnormally; Sensor error code: P0100, P0101, P0102, P0103, P0104 After receiving the goods, the car does not work properly: 1. Please use the ECU or car diagnostic equipment to check whether 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 or a car diagnostic device, I recommend you go to a professional after-sales service center to detect existing fault code in car reset. (2) Car meter indicates that engine light is on, only solution: use diagnostic device to reset car fault code, this will eliminate problem. Applications: For D21 2.4L 2389CC 14 GAS SOHC Naturally Aspirated 1993 For D21 2.4L 2389CC 14 GAS SOHC Naturally Aspirated