Many Renault owners note that third-party alarms or immobilizers slice into the factory ignition wiring. This causes resistance anomalies that trigger a permanent, non-critical DF1551 log. 2. Corroded or Blown Starter Relays
: Replacing a failing starter relay or ensuring correct battery voltage eliminates the hesitation or "struggle" during startup.
: You will likely see "Check Anti-Pollution System," "Check Injection," or "Engine Failure Hazard" on the dashboard. How to Fix and Prevent DF1551
to monitor the sensor's voltage in real-time; it should fluctuate rapidly between approximately 0.1V and 0.9V when the engine is warm. Check for Leaks
