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I have replaced idle air control valve but still getting same code. Tried resetting light. Drove truck with ac and lights on but still engine light comes on and same code

Vehicle: 1197 ford ranger xlt 2.3L engine

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P1506 Self test detected a IAC overspeed error

With this code condition you need to check for vacuum leaks that will cause the idle speed overspeed error, such as a rupture PCV hose or any vacuum leaks causing a high RPM, This code is a condition for high  idle , it has nothing to do with the IAC as being faulty.

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