The P0507 code on your 2020 Ford Explorer indicates the idle control system cannot bring idle speed down to the target—the engine is idling higher than commanded despite correction attempts.
Understanding High Idle
The PCM attempts to maintain a specific idle RPM by adjusting throttle position. When actual RPM exceeds the target and the system can't reduce it sufficiently, P0507 sets. Something is allowing more air into the engine than commanded.
Explorer Idle System
The 2020 Explorer offers multiple engines including the 2.3L EcoBoost and 3.0L twin-turbo V6. Both use electronic throttle control. High idle indicates unmetered air is entering the engine or the throttle isn't closing properly.
Causes of High Idle
Vacuum leaks allow extra air that raises idle. A stuck-open throttle body doesn't close fully. A sticking throttle cable (if equipped) holds the throttle open. IAC/electronic throttle problems prevent proper closure. Intake gasket leaks introduce unmetered air. A stuck-open EGR during idle raises RPM.
Diagnostic Process
Use Ford IDS to monitor idle speed versus target. Check for vacuum leaks—they're the most common cause. Inspect the throttle body for proper closure. Verify no throttle cable binding exists. Monitor throttle position at idle—it should be at minimum. Check EGR operation if applicable.