Fault code P0507 – a step-by-step guide to diagnosing and fixing it

Error code P0507 is displayed and the check engine light is on - what does this mean?

With this DTC, the OBD/EOBD system detects that the engine idling speed is too high. Trouble code P0507 indicates that the engine control unit has measured an engine speed above the specified set value at idling speed. This fault code can occur with various manufacturers and affects the engine's idling control system.

What causes can this fault code have?

• Defective idle control valve (IAC valve)
• Dirty or defective throttle valve sensor
• Leaks in the intake system
• Defective throttle valve or throttle valve actuator
• Damaged vacuum lines
• Dirty throttle valve
• Defective mass air flow sensor
• Faulty engine control unit (ECU)
• Loose or damaged plug connections
• Defective ignition coils or spark plugs

What symptoms occur in parallel with fault code P0507?

• Increased idling speed: The engine idles at a significantly higher speed than normal
• Uneven engine running: Fluctuating engine speed and uneven running at idle speed
• Increased fuel consumption: Fuel consumption increases noticeably due to the higher engine speed
• Starting problems: Difficulties with cold or warm starts
• Jerky engine: Especially when stopping at traffic lights or in traffic jams
• Poor throttle response: Delayed response when accelerating

How can the problem with error code P0507 be rectified?

• The repair requires a systematic diagnosis to identify the exact cause.
• Clean or replace the idle control valve (IAC), as it is often blocked by dirt or defective
• Thoroughly clean and calibrate the throttle valve to remove deposits and restore the correct position
• Check the intake system for leaks and replace damaged hoses or seals
• Test throttle sensor and replace if defective to ensure correct position reports
• Clean or replace mass air flow sensor if it reports incorrect air flow values
• Check vacuum lines and replace leaking or porous hoses
• Check the engine control unit for software errors and have it reprogrammed if necessary
• Check all electrical connections on the idle control system and repair defective plugs