Fault code P1407 – a step-by-step guide to diagnosing and fixing it

Error code P1407 is displayed and the check engine light is on - what does this mean?

The DTC P1407 is a manufacturer-specific fault code that is recognized by the OBD system and indicates a problem with the exhaust gas recirculation valve (EGR) or its control circuit. This trouble code occurs when the engine control unit detects a malfunction in the EGR valve control or position. This fault code can have slightly different meanings for different manufacturers, but usually refers to EGR system faults.

What causes can this fault code have?

• Defective EGR valve
• Blocked EGR channels due to soot deposits
• Damaged cable to the EGR valve
• Loose or corroded plug connections
• Defective EGR position sensor
• Vacuum hose leaking or damaged
• Faulty engine control unit (ECU)
• Blocked EGR cooler

What symptoms occur in parallel with fault code P1407?

• Loss of engine power: Reduced engine power, especially at higher engine speeds
• Uneven idling: Engine runs unevenly at idle speed
• Increased fuel consumption: Significantly higher consumption than usual
• Starting problems: Difficult engine start, especially when the engine is cold
• Black smoke: Dark exhaust fumes from the exhaust pipe
• Knocking noises: Metallic knocking noises from the engine compartment

How to fix the problem of error code P1407?

• Repairing EOBD error code P1407 requires a systematic approach to identify the exact cause.
• Remove the EGR valve, clean thoroughly or replace completely if defective (costs: 150-400 euros)
• Check all electrical connections to the EGR system, clean corroded contacts and replace damaged cables
• Check vacuum hoses for cracks and leaks and replace defective hoses
• Have EGR ducts and cooler professionally cleaned to remove soot deposits
• Test EGR position sensor and replace if malfunctioning (costs: 80-200 euros)
• Check engine control unit for software errors and have updates carried out if necessary