: This is a common weak point. Check the large 25A or 30A fuses and their connectors for any signs of corrosion or "melting". Moisture getting into this box is a known cause for the DF1551 code.
: Ensure your system isn't simply empty or leaking. A professional recharge can often clear pressure-related codes. renault df1551 better
Use an OBD-II diagnostic tool, such as those discussed on Scribd , to clear the fault codes after mechanical cleaning. : This is a common weak point
| Feature | OEM Renault DF1551 | Premium Aftermarket DF1551 (Better) | | :--- | :--- | :--- | | | 70,000 - 90,000 miles | 120,000 - 150,000 miles | | Fuel Economy | Baseline (45 MPG average) | +6% to +10% better | | Cold Start Performance | Rough idle below 5°C | Smooth start to -15°C | | Price (Per Injector) | $380 - $450 | $220 - $290 | | Warranty | 12 months / 12k miles | 24 months / 24k miles | | Maintenance Interval | Clean every 40k miles | Clean every 80k miles | : Ensure your system isn't simply empty or leaking