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A 2009 TOYOTA corolla with a mileage of about 116 thousand km. The customer phone showed that the car was clicking and was afraid to run and ask for help. Fault analysis: 1) the maintenance technician to the scene to confirm, indeed as described by the customer, the car has a "clatter" sound, and the sound is very brittle, sound more messy, no restart the vehicle, the car directly to the 4S store. 2) since the vehicle's time and mileage are within the scope of warranty, the recording and DTR are sent to the technical room. According to the requirements of the technical room teacher, use the stethoscope to confirm the location of the abnormal sound. First, the sound of the sound in the cold car is larger than the hot car, the part of the sound is on the upper side of the cylinder head, the sound can be heard on the intake side, the sound is not heard on the exhaust side, the sound of the 2 and 3 cylinders at the intake side is more obvious. The compression ratio of each cylinder is in the standard range. It is also normal to measure the oil pressure. 3) because the sound can be heard in the engine inside the engine, so the technical room teacher and the customer agree to remove the valve chamber cover, but there is no fault, but when pressing the hydraulic tappet, it is found that the 2 cylinder and the 3 cylinder side of the intake side can be moved by hand, according to the normal condition, the hand is inactive. After dismantling the hydraulic tappet, it was found that there were some red color leather products in the oil and hydraulic tappet, where the rubber material came from. After continuing dismantling, it was found that the rubber skin in the filter core of the oil filter had the symptoms of falling off, and it was found that the filter core was not the core of the original factory, but it was only done. More like. Check customer entry resume found that customers from May 2009 after driving 19110km has not yet entered the factory maintenance records. After enquiry, the customer found a small repair shop near his home to replace the oil and filter element because of his busy schedule. Troubleshooting: replaced the hydraulic tappet on the intake side and cleaned the whole oil circuit, and troubleshooting. Failure revelation: this failure is due to the replacement of fake parts unexpected failure. This failure in the car maintenance classroom to explain to customers can effectively reduce the customer churn rate, and the future vehicle fault judgment has more enlightenment. Fault review: fake accessories kill people! This case also gives us some difficulty in judging faults. On the other hand, the difficulty of maintenance does not lie in the process of troubleshooting. It is difficult to deal with the customer, how to convince the customer and how to make the customer establish the long-term trust relationship with the maintenance station. The case really deserves our careful consideration, including how to make the customer aware of the reliability of the professional maintenance of the 4S store and how to run this case through our daily propaganda. This is a revelation to us.