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Exactly. There are so many sub-systems in the latest diesels. EGR. VGT. Common-rail injection. DOC & DPF aftertreatment. SCR (urea) aftertreatment. Even the engine has it's own private CAN so the systems can all communicate with the ECM over two wires. Imagine how complicated it is to manage all of this. When the factory updates software to cure a problem in one sub-system, it usually screws up something in another because they are all working together. It seems like an never ending process.
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