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12 is something like no camshaft position sensor signal or something like that... they all show it as a current code when the engine isnt running
the egr...well youre pretty much going to have to diag. that. sensors not directly related to the egr system i would consider unlikely causes. more likely would be the valve itself, vacuum leak in the hoses controlling the egr, solenoid, or it seems like theres a egr temp sensor , atleast on some, blocked passages...
head gasket leaks could cause a laundry list of problems...
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