Hi there, P0506 IS usally a dirty throttle body. In order to clean properly, with the battery disconnected, they need to be taken off and cleaned front and back til' they are shiny. Sticking a rag soaked with solvent in there while it's still attached isn't going to cut it, i've seen many mechanics do it this way. When they do this, they very often DO NOT unhook the battery which you NEED to do for about an hour while cleaning.. Otherwise, the computer won't relearn the clean throttle body, and you'll have your light on again. It's very easy and cheap to do it yourself. Let me know if you'd like instructions on how to do it.
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