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What you're trying to do is overly complicated and you would need an actual auto electrician to implement. Without knowing the technical details of your particular vehicle, you won't get a straight answer. But I can tell you it varies between manufacturer and you have things like body control modules and multiples CAN buses to contend with. When you say '...


1

A couple days later, they try to bring it to a mechanic but it doesn't turn over. They jump it. It starts, but it sounds bad, and won't shift out of park. When the gas is pressed it stutters and dies. That sounds like the cat has self-destructed internally, and the debris is blocking the exhaust and creating back pressure. Try disconnecting the exhaust ...


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