What does this code mean?
Idle means the engine is running without you pressing the accelerator. P0507 means it was turning faster than expected in that situation. Air intake and its control need investigation; the code alone does not identify a failed part.
Locate the reported problem
Some engines use an idle valve; others use the electronic throttle. A generic instruction to replace an idle valve may not apply.
Read it with the other codes
P0171 or P0106 can add intake context, and purge behavior can affect idle. A temporary cold-start fast idle is not by itself the same diagnosis.
Possible causes to investigate
These are possibilities, not a diagnosis or a ranked list of failed parts.
- Unexpected intake air through a leak, ventilation or purge path.
- Throttle or idle-control behavior, including an adaptation issue after service on some vehicles.
What to do first
- Record the idle speed when warm and whether it changed after battery, throttle or intake work.
- Do not adjust throttle stops or force an electronic throttle plate. If the vehicle is difficult to control, stop using it and seek help.
What the workshop can check
Ask for a comparison of requested and actual idle speed, an intake-leak check and the manufacturer’s adaptation procedure when applicable. Cleaning or replacing a throttle body is not justified by the code alone.
A useful question to ask
What is the requested idle speed, and where is the extra airflow or control discrepancy coming from?
Your vehicle changes the next step
Year, make, model, engine and the complete code list matter. Cylinder layout, test conditions and repair procedures can differ. Use service information for the exact vehicle; a generic code does not establish an exact failed part.
Can I keep driving?
This page cannot decide whether your car is safe to drive. A flashing engine light, severe shaking, overheating, strong fuel smell or major power loss calls for prompt attention. Stop safely when needed, follow your handbook and seek assistance rather than continuing a test drive.
Terms in this guide
These words appear in the explanation. Select an underlined term in the text to reach its definition.
- Idle and rpm
- Idle is the engine running without accelerator input. Revolutions per minute, or rpm, describe how fast it turns.
- Intake
- The passages and components that bring air into the engine. The intake manifold distributes that air among the cylinders.
- Control unit
- A car computer that receives measurements and controls the engine or another system. It may also be called a module, ECU, ECM or PCM.
- Monitor
- A check the car performs when particular conditions are met. Here it does not mean a display screen.
- Throttle plate and throttle body
- The throttle plate is a flap controlling air entering the engine. The throttle body contains it; it is separate from the accelerator pedal you press.
- Purge and canister
- The canister stores vapors in activated carbon. Purging allows them into the engine to be burned. It is not an instruction to empty the fuel tank.
- Adaptation
- Learning or adjustment performed by electronic control to work with a component. Some vehicles require a specific procedure after maintenance.
Sources and scope
Definitions and general OBD context are cross-checked against the references below. Manufacturer documents describe specific vehicles and systems; their procedures and thresholds are not instructions for every make. This is educational guidance, not a vehicle-specific repair procedure.