DTC P0507-23: Idle Control System - RPM Higher Than Expected - Signal stuck low: Action

NOTE: Monitor description . Engine idle speed greater than maximum deviation allowed during catalyst operation

Using the manufacturer approved smoke test system check the intake air system is free from leakage, components are correctly installed, not loose or that damaged pipework is allowing leakage
Check Engine crankcase breather system is free from leakage, components are correctly installed, not loose or that damaged pipework is allowing leakage