When your Renault (such as a Kadjar, Mégane, or Captur) displays this code alongside a "Check Anti-Pollution System" message, it signifies that the Engine Control Unit (ECU) has detected an issue with how the vehicle manages emissions.
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While functional, the OEM DF1551 has a notorious weakness: solenoid fatigue and nozzle coking due to EGR (Exhaust Gas Recirculation) soot. When your Renault (such as a Kadjar, Mégane,