The Repair and return process is pretty simple and helps you avoid paying the high cost of a new ECU through your dealer. Please note this repair service is for one issue "only" - Coil/Injector issues (Make sure you have replaced your coils/injectors/plugs and have checked the wiring for issues prior to purchasing this service)
• If your ECU has the fan on all the time but you have no communication with the ecu and a no start, you will need to replace the unit. Let us know your part number and we can check to see if we do have a good replacement for you.
• Step 1: Click on the buy it now button, select your return shipping preference and complete checkout. (Please make sure to read the Tech Notes below prior to purchase, thanks!)
• Step 2: Package your ECU carefully so that it does not incur structural damage during shipment. Take it to the Post Office, FedEx, DHL or UPS and ship it to:
  
  Your Part Source
  4503 N Illinois St.
  Swansea, IL 62226
  Attn: R&R/(your eBay user name here)
  
  (Please make sure to include a note detailing the issues your vehicle is having and any trouble codes the vehicle is throwing. Make sure to include a contact number which we will only use if we run into an issues with the repair.)
• Step 3: The ECU arrives for repairs! We will repair your ECU the same or next business day and ship it back to you promptly. We ship on Saturdays!!
• Step 4: Since this is your computer it will return repaired, cleaned and ready for plug and play installation! It's that simple!

• This repair service is for 1 issue "only": Coil/Injector issues (Make sure you have replaced your coils/injectors/plugs and have checked the wiring for issues prior to purchasing this service
• We will use notes received from the customer and our state of the art vehicle simulator to put your ECU through over 25+ circuit tests. This will allow us to zero in on the issues and perform a thorough repair. After the rebuild the ECU will undergo the same tests to verify the repair! Your ECU case and pins will also be cleaned so it is ready for install when you receive it back! (Please make sure your connector is free of debris, oil, dirt etc etc so a good connection is made!)
• Please note that sometimes the damage to an engine computer is unrepairable. In instances where our techs test, diagnose and attempt a repair but are unable to bring the ecu back there will be a diagnostic fee of $94.99. The remaining portion of your initial purchase price will be refunded.
• If you contact us with your issues and trouble codes but it sounds like there is not a good chance of a successful repair we do stock tested/rebuilt ecu’s. We may have the ECU you need in stock and will go over options with you.

• This repair carries a Limited Lifetime Warranty!
• You will receive a detail of the repairs that took place. Those repairs are covered for Life! You may also receive install notes detailing what you may need to repair or verify good prior to installing the repaired ECU. If it is determined those repairs did not take place and the same component(s) are blown it will not be covered under the warranty. In all cases where there is an issue rest assured we will work with you to get your vehicle up and running.

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We can repair all 11 to 12 Mercedes-Benz C300 and GLK350 model ECU's! If you know your ECU is beyond repair email us with your part number and there is a good chance we have it in stock!

You are responsible for shipping the ECU to us. We offer two return shipping options. During checkout you will be able to choose one of the following:
• USPS Priority - 2 to 3 day shipping (This is included with the listed shipping cost)
• USPS Priority Express - 1 day shipping to most locations. If you live in a remote area this service may take 2 days. (There is an up-charge)
• UPS Next Day Air Saver - Guaranteed 1 day service. (There is an up-charge)
• Due to eBay's strict shipping policies we list a 15 day handling period. We anticipate your ECU arriving much sooner and when it does we will repair it the same or next business day. Once repaired the ECU will ship by the next business morning.