Analysis and Solution of Common Faults of BMW 3 Series

Recently, some netizens asked Wang Chang about the solutions to common faults of BMW 3 Series. Therefore, Wang Chang Bian Xiao consulted experts in the automobile maintenance industry and got the corresponding answer. The related contents are arranged as follows: Question 1. The phenomenon that the dashboard of BMW 320i shows the engine fault light: the dashboard shows the engine fault light. Solution: The fault indicator light of the engine has been lit, which proves that the control computer has detected the specific fault of the engine and the corresponding fault code has been stored in the computer. First of all, the engine fault code must be read by the fault diagnosis computer, and the specific judgment can be made only after the specific meaning of the fault code is clear and the relevant data flow is analyzed. In order to repair the lighting failure of this faulty lamp, it is necessary to go to the 4S shop and check the engine control system with a computer. Consumer: Under what circumstances will the engine fault light come on? Suggestion: The engine harness or sensor is faulty, or other connected equipment may be faulty. Carbon deposition, dirty throttle, etc. Will cause the engine light to come on. Second, BMW 3 18i low-speed brake abnormal sound: abnormal sound of the right rear wheel during low-speed braking. Solution: Generally, it is caused by abnormal friction between brake discs. Please focus on checking whether the brake pads are worn to the wear limit and whether there are too many steps on the inner and outer edges of the brake disc. Another possibility is that there are fine sand particles mixed between the brake discs, or the brake pads themselves have hard spots. In this case, you can grind the brake disc after the inspection and try again. If the abnormal noise does not disappear, you need to send the car to a special store for field test. Consumer: How to clean the impurities on the brake disc? Suggestion: You can go to a professional repair shop to polish the brake disc plane. Third, BMW 325i empty keywords: air conditioning phenomenon: the tuyere temperature test is above 10 degrees, while the BMW tuyere temperature standard is below 10 degrees. Solution: If the refrigeration effect is better when driving at high speed, there are two main differences between high speed and low speed for the operation of air conditioning system: first, the higher the vehicle speed, the better the refrigeration effect of condenser; Then, the higher the vehicle speed, the higher the corresponding engine speed. Therefore, the higher the speed of the air compressor. According to the above analysis, you'd better go to the 4S shop to check the air conditioning system, focusing on the heat dissipation effect of the water tank condenser and the working performance of the air conditioning compressor. Consumer: Under what circumstances does BMW usually encounter heat dissipation problems? Suggestion: Generally, walking on the wading road is easy to be attached by sundries around the condenser or water tank, resulting in no heat dissipation. Fourth, the water temperature of BMW 325i is high and low: the water thermometer is high and low when driving. Solution: The fluctuation of water thermometer is related to many factors. Firstly, check the working condition of thermostat, the cleanliness of water tank and condenser, whether the cooling water circulation system (including water pump, belt and engine water channel) is normal, and the quality of antifreeze. These factors will affect the change of water temperature. In addition, if the engine has too much carbon deposit or the ignition time is too early, the water temperature will also rise. In addition, if there is a problem with the relevant circuit of the water thermometer, it will also cause the water thermometer to fluctuate. Consumer: Does the water temperature meter affect the use of vehicles? Suggestion: When there are abnormal phenomena such as water thermometer alarm, it is recommended not to drive again. After waiting for the bus to rest for a while, go to a professional maintenance station for inspection. Avoid other parts of the engine from cracking due to high temperature. 5. Abnormal noise of BMW 325i chassis: After parking, the car always makes the sound of wires hitting metal. Solution: This is the sound made by the exhaust pipe or insulation board after the vehicle is turned off, or it may be the sound made by the three-way catalyst. You can go to the 4S shop and ask the after-sales technicians to help you check on the spot. Consumer: Is this caused by expansion due to heat and contraction due to cold? Suggestion: After the vehicle stops in winter, the metal will generally emit the sound of thermal expansion and cold contraction. This is a normal phenomenon. The above are the solutions to the common faults of BMW 3 Series collected by Wang Changbian. I hope to help all car owners and friends!

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