ECU Purchases: Our used ECU'S and BSI's come with a 12 month warranty (excludes water ingress and burn issues caused by vehicle faults). If you have replaced your ECU due to either of these faults you must rectify the original fault prior to fitting this ECU. We will replace the ECU if it fails within 12 months, we do not cover any other cost incurred. If an ECU has been prepared for you with the data from your original ECU / BSI a test hire charge will apply if you return the ECU / BSI for any reason. This will cover our costs to prepare the ECU / BSI for you.