Fuel and air

P0507 — Idle RPM Higher Than Expected

Severity: low Safe to drive

What P0507 means

The engine control unit compares actual idle speed with a target that depends on engine temperature and load. If rpm stays above the target even though the idle control is already admitting as little air as it can, P0507 is stored. The usual cause is extra air entering the engine that the system is not metering.

Symptoms

  • Check Engine Light on
  • Idle speed higher than normal
  • Rough or unstable idle
  • Worse fuel economy
  • Surging or hunting rpm
  • High idle at stops and in Park

Possible causes

  1. Vacuum leaks from cracked hoses, intake manifold gaskets or vacuum lines
  2. Dirty throttle body
  3. Sticking or faulty idle air control (IAC) valve or its circuit
  4. PCV valve stuck open
  5. Faulty or skewed TPS, MAP or MAF sensor readings
  6. Damaged wiring or a poor ground connection
  7. Idle relearn not performed after cleaning or replacing the throttle body

How to diagnose

  1. Scan for codes and freeze-frame data, and look for lean codes such as P0171 or P0174
  2. Inspect vacuum hoses, intake ducting and manifold gaskets for cracks and loose fittings
  3. Smoke test the intake, or carefully spray around joints and watch for an rpm change
  4. Check the PCV valve and hose for sticking or leaking air
  5. Inspect the throttle body and clean it with a proper cleaner if sooty
  6. Review live TPS, MAP, MAF and IAC or throttle position data at idle
  7. Check connectors, wiring and grounds at the throttle and sensors
  8. After repair, clear the code and perform an idle relearn

Common fixes

  • Repair the vacuum leak: replace hoses, gaskets or seals
  • Clean or replace the throttle body
  • Replace the IAC valve or service the electronic throttle
  • Replace the PCV valve
  • Replace a faulty sensor or repair the wiring

P0507 on different brands

Ford · manuals
Ford documents the three-byte format P0507:00 (no sub type) for its 2024-2025 gasoline engines, meaning the monitor saw idle rpm above expected, which points to a condition rather than a confirmed failed part.

Questions and answers

What does P0507 mean?

It means the engine idles faster than the target and the control unit can't bring it down. Vacuum leaks and a dirty throttle body are the most common reasons.

Can I drive with a P0507 code?

Usually yes for a short time. Fuel economy will suffer and the high idle can be annoying, so have it diagnosed soon.

Will cleaning the throttle body fix it?

Often, if carbon buildup is the cause. An idle relearn is usually needed afterward, or the idle may stay uneven.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.