Fault code P1507 – a step-by-step guide to diagnosing and fixing it

Error code P1507 is displayed and the check engine light is on - what does this mean?

The DTC P1507 is recognized by the OBD system if there is a problem with the idle control valve or the idle speed control. This manufacturer-specific error code mainly occurs in Ford vehicles and indicates a fault in the air management system.

What causes can this fault code have?

• Defective idle speed control valve (IAC valve)
• Dirty or blocked idle control valve
• Damaged cable connections to the IAC valve
• Loose or corroded plug connections
• Defective engine control unit (PCM)
• Vacuum leaks in the intake system
• Blocked air ducts in the throttle body
• Faulty throttle valve
• Defective mass air flow sensor

What symptoms occur in parallel with fault code P1507?

• Irregular idling: The engine runs unevenly or fluctuates when idling
• High idling speed: The engine speed remains permanently above the normal idling range
• Engine stalling: The vehicle stalls when stopping or idling
• Starting problems: Difficulty starting the engine, especially when the engine is cold
• Jerking when driving: Uneven engine running at low engine speeds
• Increased fuel consumption: Noticeably higher consumption due to disturbed mixture formation

How can the problem with error code P1507 be rectified?

• The repair requires a systematic diagnosis of the idle control system.
• Clean the IAC valve: Remove the idle control valve and clean thoroughly with brake cleaner or special throttle valve cleaner, then perform a function test
• Replace the IAC valve completely: If the valve is defective, replace with a new or reconditioned idle control valve including new seals
• Check and repair cable connections: Check all cables to the IAC valve for breaks or corrosion, repair or replace damaged cables
• Clean plug connections: Disconnect all electrical connections to the idle control valve, clean with contact spray and reconnect firmly
• Eliminate vacuum leaks: Systematically check all vacuum hoses and connections, replace defective hoses and seal connections
• Clean the throttle body: Completely clean the throttle body and air ducts with a suitable cleaner
• Replace the mass air flow sensor: If the MAF sensor is defective, replace it with a new component and then calibrate it