Feature:1. Applicable Model: Engine computer control module is replacement for Benz S300 S350 R350 E300, fit for 272 273 engine, please confirm whether your model is applicable before buying.2. OE Number: The part numbers for reference is A2721532491, please confirm whether it is consistent with the OE you need.3. Stable Performance: The engine computer board is made of durable aluminum alloy housing and precision welded internal circuit board, which effectively prevents vibration and wear and ensures stable operation and long lifespan.4. Multifunction: ECU has powerful functions, including control of the working state of the engine, strong anti interference ability, has many interfaces, and can communicate and integrate with other vehicle systems.5. Reprogram and Recode Needed: Not a plug and play unit. It needs to be reprogrammed and recoded, and can be used to replace the burned out computer board of the original car.Specification:Item Type: Car Engine Computer BoardOEM: A2721532491Installation Type: Replacement for original part, direct replacementFitment: Replacement for Benz 272 273 Engine(Please check the parts number of the original car before purchase, installation needs programming)Function and Application: 1. Control the Working State of the Engine: The engine control module is the core device for engine control. It analyzes and controls the engine by receiving signals from sensors to improve fuel economy, reduce emissions, and protect the engine;2. Strong Protection and Anti interference Ability: The engine control module adopts precision hardware components and efficient software algorithms, with strong anti interference ability and high reliability, can work normally in harsh working environments;3. Comprehensive Functions, Strong Expandability: The engine control module has rich functions and interfaces, can communicate and integrate with other vehicle systems (such as transmission, ABS, in-vehicle entertainment system, etc.) to achieve intelligent vehicle control;Installation Precautions:1. It is recommended to find a professional auto repair engineer for installation, and the computer board needs to be programmed before installation2. Pay attention to the installation of the product, first check the cause of the damage of the computer board before, to avoid damaging the computer board again due to the same failure;3. Check whether the voltage is normal before installing the computer board (voltage is about 12V), it is recommended not to install more than 15V, check whether the line is normal, whether the iron is good, otherwise there is the possibility of damage to the computer board;4. After installing the computer board (insert the plug for trial operation), the key is turned on and off to the NO position three or four times before starting.5. If the vehicle has an anti-theft function, it needs to be decoded (matched) before it can be installed, which will depend on your car rather than the computer boardCorrect Installation Method:1. First remove a firewire from the battery wire, then install the computer board (circuit board) on it, and then connect the battery wire.2. Put the car key on NO, do not leave the car, wait 1-2 minutes before ignition,3. If the last time it does not catch fire, repeat the previous step, or check whether there is dust inside the plug of the computer board, if there is, you can clean it with a clean brush, or check whether the pin is neat, so that the computer board is basically OKCommon Troubleshooting Methods:1. If the fault indicator is on, the sensor is faulty.2. Repeatedly burn the computer board "ECU" or cannot afford to refuel, please check whether the generator voltage is normal.3. There is a lack of cylinder phenomenon, check whether the spark plug, ignition line, fuel nozzle, etc., is normal.4. If the idle speed is unstable, please check whether the idle motor and throttle valve body are normal and have foreign bodies.5. If the startup is difficult, check whether the pressure sensor and water temperature sensor are normal.6. If the crankshaft cannot be started, check whether the crankshaft position sensor Speed Sensor is normal.Circuit Board Basics:1 Product installation: confirm the product model and specifications match, install and fix the new circuit board, connect the wiring harness connector, repeatedly switch the ignition switch 3-5 times "switching time 2-3s, closing time 4-6s"2 Check and judge after installing the computer board:1) Whether the idle speed runs normally "heat engine 800-950 RPM, cold machine 1000-1300 RPM",2) Whether the electronic fan works normally "85 open, 90 close",3) Whether the air conditioner runs normally "Open idle speed increased to 1100-1300 RPM",4) Whether the exhaust gas of the heat engine is normal "If it is abnormal, please check the pressure sensor",5) If there is idle speed, please adjust the ignition Angle properly..Package List:1 x Car Engine Computer BoardNote:Please confirm the original part number and ens