This is what happened: One day, before the OAT was installed, the car would not fire up. The starter turned the engine but that was all. I had the car towed (on a flatbed) to a BMW shop, where the burnt fuse was found. (Total bill $200!!!). The SES light was on before this happened. The shop turned it off but it came on again. I installed the OAT and that seems to have cured the problem. I am not 100% convinced that the OAT itself was the cure or ....!!!??? One way to find out would be, perhaps to disconnect the OAT and see what happens.