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What are the reasons why the mechanical key of the Buick LaCrosse cannot open the door?

1 Answers
HeidiLee
07/30/25 2:47am
Buick LaCrosse mechanical key cannot open the door for the following reasons: 1. Disengagement: The mechanical key does not work due to disengagement. The reasons for disengagement include: the lock actuator not moving, which is caused by poor contact in the central control system circuit; if it moves, it is due to high resistance in the lock mechanism, usually caused by rust; it could also be due to the position of the door lock motor latch shifting, which can be adjusted at a repair shop; another reason is the door lock motor being damaged, resulting in insufficient pulling force. 2. Vehicle status: If the vehicle is in anti-theft lock mode, not only will the engine be locked, but the central locking system will also prevent the mechanical key from opening the door.
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Volkswagen EA211's original engine oil is 5W40. Relevant information is as follows: 1. Introduction to engine oil grade standards: VW50200 is Volkswagen's own set of standards, compatible with SN-grade 5W40 oil that meets the VW50200 standard. SN is the engine oil quality grade standard set by the American Petroleum Institute (API). S stands for gasoline engines, while C represents diesel engines. The performance grades of engine oil start from A, currently up to P, so SP is the highest quality grade standard for engine oil. 2. Meaning of 5W40: 5W40 is an all-season engine oil, where 5W indicates that this oil can ensure normal engine startup at a minimum ambient temperature of -30°C. 40 means the oil's fluidity at 100°C is 14.5cst. Overall, 5W40 is still an engine oil with relatively high high-temperature viscosity, typically used only by German cars such as Volkswagen and Audi.
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Fuel consumption per 100 kilometers = Amount of fuel consumed / Distance traveled. Examples are as follows: 1. For instance, if a car consumes 7.3 liters of fuel after traveling 100 kilometers, the fuel consumption per 100 kilometers is 7.3 liters. 2. For example, when the fuel warning light comes on, the car refuels with 36 liters at the gas station, and the odometer shows 450 kilometers. Dividing 36 liters by 4.5 gives 8, which is the fuel consumption per 100 kilometers. Additional information: 1. Fuel consumption generally refers to constant-speed fuel consumption. Constant-speed fuel consumption is the fuel consumption per 100 kilometers obtained in the constant-speed fuel consumption test for certain types of vehicles as specified by national standards. 2. These types of vehicles include: 1. M1 category, M2 category with a maximum design total mass not exceeding 3.5 tons, and N1 category compressed natural gas vehicles; M1 category and N1 category vehicles with a maximum design total mass not exceeding 3.5 tons, tested according to the method specified in GB/T-12545.1-2008 "Test methods for fuel consumption of passenger cars". 2. M2 category, M3 category with a maximum design total mass exceeding 3.5 tons, and N2 category, N3 category compressed natural gas vehicles; M2 category, M3 category, and N category vehicles with a maximum total mass greater than or equal to 2 tons, tested according to the method specified in GB/T-12545.2-2001 "Test methods for fuel consumption of commercial vehicles".
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