Use an OBD2 scanner to find the primary fault code (e.g., P0380 for glow plugs or P0470 for exhaust pressure).
main problem. It is usually a "secondary" code triggered by another fault. Common hidden causes include: Exhaust Pressure Sensor: A frequent failure point on the 1.5 dCi engine that triggers multiple warnings. Accelerator Pedal Sensor: Faulty signals from the pedal can cause the computer to shut down cruise control functions for safety. Wiring Issues: Corroded connectors or broken wires near the ECU or engine loom often lead to "ghost" codes like P1525. DPF Problems: If the Diesel Particulate Filter is clogged and needs regeneration, it can trigger various injection-related codes. Solving the Mystery Mark eventually found that his P1525 was actually caused by a tiny split in a p1525 renault megane 3
On many Renault diesel engines (especially the 1.5 dCi K9K), P1525 often points to a brake pedal switch or throttle pedal sensor issue, not the AC compressor. It indicates a "plausibility" problem between the brake pedal signal and the accelerator pedal position. Use an OBD2 scanner to find the primary fault code (e
Look for splits or oil leaks in the rubber hoses leading to the intercooler, as this is a common "Check Injection" cause on the 1.5 dCi engine. Common hidden causes include: Exhaust Pressure Sensor: A
