P0507: Idle Air Control System RPM Higher Than Expected

What does P0507 mean?

The ECM sets a target idle speed based on temperature, electrical load and other inputs, and adjusts the air that bypasses the throttle to reach it.

If the engine keeps idling faster than that target, extra air is usually getting in somewhere the ECM cannot control, and it stores P0507.

Common symptoms

• Check engine light on
• High idle speed
• Rough or unstable idle in some cases

Common causes

The causes below are the ones commonly seen with P0507. The actual cause can vary by vehicle, engine and mileage, so treat this list as a starting point, not a diagnosis.

• A vacuum or intake air leak after the throttle
• A sticking or faulty idle air control valve
• A dirty throttle body

What to check with a scanner

• In Live data, compare actual idle rpm with desired idle rpm.
• Listen for hissing that suggests a vacuum leak, and inspect hoses and the intake.
• Inspect and clean the throttle body if it is dirty.
• Some vehicles need an idle relearn after throttle body cleaning or battery disconnection. Follow your service information.

How to read and clear P0507 with OBD Master Pro

1. Plug in your adapter. Connect a generic ELM327 (or ELM329) OBD2 adapter to the diagnostic port, usually under the dashboard on the driver's side. Bluetooth Classic, Bluetooth LE, Wi-Fi and USB OTG adapters are supported.
2. Switch the ignition on. Turn the key to ON or start the engine, depending on your car.
3. Connect in OBD Master Pro. Open the app, go to Connection and pick your adapter. Classic Bluetooth adapters connect from the Bluetooth tab, Bluetooth LE adapters from the BLE tab with no pairing needed. Use the generic OBD2 / EOBD profile or your car's brand profile.
4. Read the codes. Open the fault codes screen to see stored, pending and permanent codes. Confirm P0507 is listed and note any other codes, since they often explain the cause.
5. Check the details. Look at freeze frame data, Live data and, where your car supports it, Mode 06 test results (see the checks above).
6. Fix, then clear. After the repair, clear the codes to turn off the check engine light. Clearing also resets the emissions readiness monitors, so drive normally and check the readiness screen before any inspection. Permanent codes cannot be erased with a scan tool; they clear on their own once the car's self test passes.

Tip: you can also look up P0507 and other codes in the app's DTC search without connecting to a car. If your adapter will not connect, use Connection > Share connection log and email it to support. Many cheap ELM327 clones only handle basic engine OBD2, which is all you need for P0507.

When to see a mechanic

Get professional help if any of these apply:

• The idle stays high after cleaning and checking for leaks
• You need a smoke test to find a vacuum leak
• The car creeps forward strongly at idle

If you are unsure, a qualified technician can confirm the cause with tests such as smoke testing, pressure testing or scope readings. Clearing a code does not repair the fault.

Related trouble codes

See all OBD2 trouble code guides

Related guides

Check engine light on: what to do · How to read an OBD2 code (P, B, C, U) · Stored, pending and permanent codes and freeze frame · OBD2 readiness monitors explained · OBD2 glossary · OBD2 by car brand