The DTC 1525F3 code is a common "umbrella" fault found in the Renault Megane 3. If your dashboard is displaying "Check Injection" or "Check Cruise Control" alongside this code, here is what you need to know to fix it. What Does DTC 1525F3 Actually Mean?
💡 1525F3 is rarely the root cause. You must look for a secondary fault code (e.g., P0470, P0380) to find the real problem. Most Common Causes
: Problems with the EGR valve or Mass Air Flow (MAF) sensor.
The manifestation of DTC1535F3 is often subtle at first but can escalate quickly. The most immediate symptom is the illumination of the "Check Injection" or "Check Anti-pollution" message on the dashboard. The driver may notice that the radiator cooling fan fails to operate, particularly when the vehicle is idling or when the air conditioning is engaged.
: If the battery is older than 4–5 years, have it load-tested. Low voltage during startup can throw random communication codes. 1525F3 code in Renault vehicles: Common reasons
