A2731535079 ME9.7 ECU Electronic Control Module For B-enz Wear Proof A2731535079 Perfect Fit Heavy Duty Durable for Car ECU Engine Control Module Specification: Type: Engine Computer BoardFitment Type: Direct InstallPart Number: A2731535079 A2731533079 A2731536591Reference Part Number: A2721535291, A2721533692, A2729001300, A2729002900, A2729005400, A2721534991, A2721530391Interchange Part Number: A2721533779, A2721535479, A2721530391, A2721533291, A2721531291, A2721536091, A2721534991, A2721535091, A2721537591, A2721535191, A2729004700, A2721532491, A2731534879, A2731534979, A2721535691, A2721535391, A2731535079, A2721531679 Note: If you find it doesn’t have your part number, you can feel free to contatct us: email: [email protected] WhatsApp:  8613728823411 ECU Engine Control Module Fitment: Fits for Mercedes-BenzS Class 2004-2010 CL 500 2008-2011216 CL 500 / CL 550 USA / JAPAN221 S 500 / S 550 USA / JAPAN221 S 500 4MATIC / S 550 4MATIC USA / JAPAN221 S 500 / S 550 USA / JAPAN221 S 500 4MATIC / S 550 4MATIC USA / JAPAN Engine Control Module Installation Note: Installation and programming is highly recommended by professional engineers When installing the product, pay attention to check the reason for the previous computer board to avoid burning the computer board again with the same fault. Check whether the voltage is normal (voltage about 12V) before installing the computer board, it is recommended not to install it above 15V, check whether the line is normal and whether the iron is good, otherwise there is a possibility of burning the computer board. After installing the computer board (insert the plug for trial operation), the key is turned on to the NO position, and it can be switched back and forth three or four times before starting.  If the car has anti theft function, you need to decode (match) first, this depends on your car and not the computer board. Engine Control Module Installation Method: First unload the battery wire a live wire, then install the computer board (circuit board), and then connect the wire. After the car key turn to NO, do not land the car, wait 1-2 minutes, and then ignite. If the fire cannot be caught last time, repeat the previous step and try again, or see if there is dust inside the computer board and the computer board plug, if there is any, you can clean it with a clean brush, or check whether the pins are neat, so that the computer board is basically OK. Engine Control Module Packing List: 1 x Engine Computer Control Module Note: Please check the OEM of ECU carefully before purchase. (Contact [email protected] or 86 137 2882 3411 to let me know your ECU number)It is highly recommended to find a professional engineer for installation and programming !!! (Otherwise it will cause circuit board damage situation)