常见故障及诊断思路​

Common faults and diagnostic ideas

发动机故障​

Engine malfunction

发动机抖动：这是奔驰发动机常见问题之一。火花塞老化或积碳可能是原因之一，火花塞负责点燃混合气，若工作不良，混合气无法充分燃烧，便会导致发动机抖动。可以通过观察火花塞电极磨损情况和积碳程度来判断是否需要更换。此外，喷油嘴堵塞也会引起类似问题，喷油嘴负责将燃油喷射到气缸内，堵塞时喷油不均匀，影响燃烧效果。专业维修人员一般会使用专业设备对喷油嘴进行清洗或更换。​

Engine shaking: This is one of the common problems with Mercedes Benz engines. Aging or carbon buildup of spark plugs may be one of the reasons. Spark plugs are responsible for igniting the mixture. If they do not work properly, the mixture cannot burn fully, which can cause engine shaking. It can be determined whether replacement is necessary by observing the wear and carbon deposition of the spark plug electrode. In addition, clogged fuel injectors can also cause similar problems. Fuel injectors are responsible for injecting fuel into the cylinder, and when clogged, the fuel injection is uneven, affecting the combustion effect. Professional maintenance personnel generally use specialized equipment to clean or replace fuel injectors. ​

发动机启动困难：可能是蓄电池电量不足，奔驰车电子设备多，对电量需求大，长时间停放或蓄电池老化都可能导致电量不足，此时用专业检测仪检测蓄电池电压即可判断。还有可能是燃油泵故障，燃油泵负责将燃油从油箱输送到发动机，若其工作异常，无法提供足够压力，发动机便难以启动。维修时需检查燃油泵工作压力和电路连接情况。​

Difficulty starting the engine: It may be due to insufficient battery power. Mercedes Benz cars have many electronic devices, which require a large amount of power. Long term parking or aging of the battery may also cause insufficient power. At this time, a professional tester can be used to detect the battery voltage to determine the issue. It is also possible that the fuel pump is malfunctioning. The fuel pump is responsible for delivering fuel from the fuel tank to the engine. If it works abnormally and cannot provide sufficient pressure, the engine will be difficult to start. During maintenance, it is necessary to check the working pressure and circuit connection of the fuel pump. ​

发动机故障灯亮：这涉及的原因较为复杂，氧传感器故障较为常见。氧传感器用于监测排气中氧含量，以此调节混合气浓度，故障时会使混合气过浓或过稀，导致故障灯亮起。维修人员需读取故障码，根据故障码提示进一步检测氧传感器的信号电压等参数，判断是否需要更换。另外，空气流量计故障也会影响发动机进气量的测量，导致混合气比例失调，引发故障灯亮，同样需通过专业检测设备对其进行检测维修。​

Engine malfunction light on: The reasons involved are complex, and oxygen sensor failures are common. The oxygen sensor is used to monitor the oxygen content in the exhaust gas, in order to adjust the concentration of the mixture. In the event of a malfunction, the mixture may become too rich or too lean, causing the malfunction light to turn on. The maintenance personnel need to read the fault code and further test the signal voltage and other parameters of the oxygen sensor according to the fault code prompt to determine whether replacement is needed. In addition, a malfunction in the air flow meter can also affect the measurement of engine intake volume, leading to an imbalance in the mixture ratio and causing the malfunction light to turn on. It also requires professional testing equipment for inspection and maintenance. ​

自动变速器故障​

Automatic transmission malfunction

换挡冲击：奔驰自动变速器出现换挡冲击，可能是变速器油液不足或变质。变速器油不仅起到润滑作用，还传递动力，油液不足会导致油压不稳定，变质则会影响其性能。维修时需先检查油位，若不足添加同型号油液，若变质则需彻底更换。此外，电磁阀故障也可能引发换挡冲击，电磁阀控制变速器内部油压和换挡执行机构，故障时会使换挡时机不准确。维修人员需使用诊断仪检测电磁阀工作状态，必要时进行更换。​

Shift shock: Mercedes Benz automatic transmission may experience shift shock due to insufficient or deteriorated transmission fluid. Transmission oil not only provides lubrication, but also transmits power. Insufficient oil can lead to unstable oil pressure, and deterioration can affect its performance. When repairing, it is necessary to first check the oil level. If it is insufficient, add the same type of oil. If it deteriorates, it needs to be completely replaced. In addition, a malfunction of the solenoid valve may also cause a shift shock. The solenoid valve controls the internal oil pressure and shift actuator of the transmission, and in the event of a malfunction, the shifting timing may be inaccurate. Maintenance personnel need to use a diagnostic tool to check the working status of the solenoid valve and replace it if necessary. ​

变速器打滑：多片离合器磨损过度是常见原因。多片离合器负责连接和断开变速器内部不同齿轮组，实现换挡，磨损后会导致动力传递不畅，出现打滑现象。维修时需拆解变速器，检查离合器片的磨损情况，进行更换。另外，变速器油压过低也会造成打滑，需检查油泵工作情况和油路是否存在泄漏。​

Transmission slippage: Excessive wear of the multi plate clutch is a common cause. The multi plate clutch is responsible for connecting and disconnecting different gear sets inside the transmission to achieve gear shifting. Wear and tear can cause poor power transmission and slip. During maintenance, it is necessary to disassemble the transmission, check the wear of the clutch plates, and replace them. In addition, low transmission oil pressure can also cause slippage, and it is necessary to check the working condition of the oil pump and whether there are leaks in the oil circuit. ​

底盘故障​

Chassis malfunction

悬挂系统异响：奔驰的悬挂系统较为复杂，常见的异响原因是减震器漏油。减震器负责缓冲路面颠簸，漏油后其阻尼力下降，无法有效减震，行驶时会发出异常响声。维修人员通过观察减震器外观是否有油渍来判断，若漏油需及时更换减震器。此外，悬挂球头磨损也会产生异响，球头连接悬挂部件，磨损后间隙变大，在行驶中会发出 “咯噔” 声，需检查球头间隙，必要时进行更换。​

Suspension system abnormal noise: Mercedes Benz's suspension system is relatively complex, and the common cause of abnormal noise is shock absorber oil leakage. The shock absorber is responsible for buffering road bumps. After oil leakage, its damping force decreases, making it unable to effectively absorb vibrations and producing abnormal noises while driving. The maintenance personnel determine whether there are oil stains on the appearance of the shock absorber, and if there is oil leakage, the shock absorber should be replaced in a timely manner. In addition, the wear of the suspension ball head can also produce abnormal noise. The ball head is connected to the suspension components, and the clearance increases after wear, making a "clunking" sound during driving. It is necessary to check the clearance of the ball head and replace it if necessary. ​

制动系统故障：制动片磨损是常见问题，奔驰车制动性能强，制动片磨损相对较快。当制动片厚度接近磨损极限时，仪表会提示更换。若未及时更换，不仅制动效果下降，还可能损坏制动盘。维修时直接更换符合规格的制动片即可。另外，制动盘表面磨损不均匀会导致制动时车辆抖动，此时需对制动盘进行打磨或更换。​

Brake system malfunction: Brake pad wear is a common problem. Mercedes Benz cars have strong braking performance, but brake pad wear is relatively fast. When the thickness of the brake pads approaches the wear limit, the instrument panel will prompt for replacement. If not replaced in a timely manner, not only will the braking effect decrease, but it may also damage the brake disc. Simply replace the brake pads that meet the specifications during maintenance. In addition, uneven wear on the surface of the brake disc can cause the vehicle to shake during braking, and in this case, the brake disc needs to be polished or replaced. ​

维修工具与设备​

Maintenance tools and equipment

专业诊断仪​

Professional diagnostic equipment

奔驰汽车电子系统复杂，专业诊断仪必不可少。如奔驰原厂的 STAR 诊断仪，它能与车辆的各个控制模块进行通信，读取故障码、数据流，对车辆系统进行编程和设码等操作。通过诊断仪，维修人员能快速准确地判断故障所在，大大提高维修效率。例如，当发动机故障灯亮起时，使用 STAR 诊断仪读取故障码，若显示为某传感器故障，可根据故障码提示进一步检查传感器及其线路。​

Mercedes Benz's electronic system is complex, and a professional diagnostic tool is essential. Like Mercedes Benz's original STAR diagnostic instrument, it can communicate with various control modules of the vehicle, read fault codes and data streams, program and code the vehicle system, and perform other operations. Through the diagnostic instrument, maintenance personnel can quickly and accurately determine the location of the fault, greatly improving maintenance efficiency. For example, when the engine malfunction light is on, use the STAR diagnostic tool to read the fault code. If it shows a sensor fault, further check the sensor and its circuit according to the fault code prompt. ​

专用工具​

Special tools

火花塞套筒：奔驰发动机火花塞规格特殊，需要专用的火花塞套筒才能拆卸和安装。这种套筒尺寸精确，能避免在操作过程中损坏火花塞。​

Spark plug socket: Mercedes Benz engine spark plugs have special specifications and require specialized spark plug sockets for disassembly and installation. This sleeve has precise dimensions and can avoid damaging the spark plug during operation. ​

变速器油加注工具：奔驰自动变速器对油液加注量和加注方式有严格要求，专用的变速器油加注工具能确保准确加注适量的油液，保证变速器正常工作。例如，在更换变速器油时，使用专用加注工具可将新油准确注入变速器，避免因加注量不当导致变速器故障。

Transmission oil filling tool: Mercedes Benz automatic transmission has strict requirements for the amount and method of oil filling. The dedicated transmission oil filling tool can ensure accurate filling of the appropriate amount of oil to ensure the normal operation of the transmission. For example, when replacing transmission oil, using a specialized filling tool can accurately inject new oil into the transmission to avoid transmission failure caused by improper filling.

本文由济南奔驰汽车维修友情奉献.更多有关的知识请点击:http://www.lutongqixiu.com我们将会对您提出的疑问进行详细的解答，欢迎您登录网站留言.

This article is dedicated to friendship For more information, please click: We will provide detailed answers to your questions. You are welcome to log in to our website and leave a message