When the sensor’s signal is out of the calibrated window, the ECU assumes a fault and logs DTC 1525 F3.
| Item | Description | |------|-------------| | | 1525 F3 | | System | Turbocharger / Boost Pressure Sensor (BPS) | | Typical Renault models | Clio III/IV, Megane III/IV, Scénic III/IV, Captur, Kadjar, Koleos, Duster, Talisman, Zoe (when equipped with a turbocharged engine) | | Engine families | 1.3 T, 1.5 dCi, 1.6 T, 1.8 T, 2.0 dCi, 2.0 T, and other Renault‑Espace turbocharged gasoline/diesel units | | Severity | Medium – The engine can still run, but performance may be reduced, fuel consumption can increase, and the turbocharger may be under‑ or over‑boosted, potentially leading to long‑term damage. | | MIL (Malfunction Indicator Lamp) | Illuminates when the ECU detects a pressure reading that is outside the calibrated range for a defined number of cycles (usually 3–5 consecutive cycles). | renault dtc1525f3
After some research and advice from a Renault specialist, this code points to a fuel pressure regulator issue – specifically “Fuel Pressure Regulator Coherence” or a circuit malfunction on the high-pressure fuel rail. In plain English: the ECU is seeing a fuel pressure value that doesn’t match the expected range. When the sensor’s signal is out of the
: Leaks in the intercooler hoses or a faulty MAP (Manifold Absolute Pressure) sensor are frequent triggers for this "multiplex signal" error. ✅ Recommended Action Plan 1525F3 code in Renault vehicles: Common reasons | After some research and advice from a
| Repair Item | Parts Cost (EUR) | Labor (hrs) | Labor Cost (EUR) | Total Approx. | |-------------|------------------|-------------|------------------|---------------| | | 120 – 200 | 0.8 – 1.2 | 70 – 120 | 190 – 320 | | Repair/replace wiring harness | 30 – 80 (depends on length) | 0.5 – 1.0 | 45 – 100 | 75 – 180 | | Turbo wastegate actuator replacement | 250 – 400 | 1.5 – 2.0 | 100 – 160 | 350 – 560 | | Intercooler/Intake pipe leak repair | 40 – 120 (clamps, hoses) | 0.6 – 1.0 | 45 – 80 | 85 – 200 | | ECU software update | Usually free (dealer) | 0.2 – 0.4 | 20 – 40 | 20 – 40 |