Df357 | Renault

Understanding Renault Fault Code DF357: Causes and Fixes If you own a Renault Megane, Fluence, or similar model and your diagnostic tool just flagged DF357, you’ve likely noticed a sudden drop in performance or warning lights on your dash. This specific manufacturer code is often tied to critical safety and drivetrain systems, particularly the ABS/ESP or the CVT transmission.

In this guide, we’ll break down what DF357 means, why it happens, and how to get your Renault back on the road safely. What is Fault Code DF357?

In the world of Renault diagnostics, "DF" stands for Défaut de Fonctionnement (Malfunction Fault). While generic OBD-II codes like P0500 refer to vehicle speed sensors, DF357 is a Renault-specific code that usually points to a Wheel Speed Sensor Circuit or a communication issue within the ABS (Anti-lock Braking System) and ESP (Electronic Stability Program). Common Symptoms

Warning Lights: The ABS, ESP/Traction Control, and "Check Braking System" lights illuminate on the dashboard.

Limp Mode: The car may restrict engine power or prevent the cruise control from working to ensure safety.

Transmission Issues: On models with a CVT transmission, a DF357 error can trigger secondary transmission faults, as the gearbox relies on accurate wheel speed data to manage gear ratios. Primary Causes of DF357

The most frequent culprit for this code isn't actually a "broken" computer, but a physical failure at the wheels. 1. Damaged ABS Ring (Tone Ring) renault df357

This is the most common cause. The ABS ring is a toothed metal ring mounted on the wheel hub or axle. Over time, road debris (like a stray stone) or rust can chip or crack the ring. If the teeth are damaged, the sensor cannot read the wheel's rotation correctly. 2. Faulty Wheel Speed Sensor

The sensor itself—a small electromagnetic probe—can fail due to internal electrical shorts or external grime buildup. If it stops sending a signal to the ECU, DF357 is often the result. 3. Wiring Harness Damage

Renaults are known for sensitive electrical systems. Frayed wires or corroded connectors near the wheel arch can break the circuit between the sensor and the main ABS module. How to Diagnose and Fix DF357 Step 1: Identify the Affected Wheel

Use a specialized Renault diagnostic tool (like Carly for Renault or Renault CAN Clip) to see which specific wheel is reporting the error (e.g., "Left Rear Wheel Speed Sensor Circuit"). Step 2: Inspect the ABS Ring

Physically inspect the metal ring behind the wheel. Look for: Cracks in the ring. Missing teeth or heavy rust. Signs of impact from stones. Step 3: Check the Sensor and Wiring

Ensure the sensor is seated properly and that the wiring isn't rubbing against the suspension or tires. You can test the sensor’s resistance with a multimeter; if it reads "Open Circuit," the sensor needs replacement. Step 4: The Repair Understanding Renault Fault Code DF357: Causes and Fixes

If the ring is broken: You may need to replace the entire wheel hub or the axle assembly, though some models allow for the replacement of just the ring itself. A 36mm socket and Torx 60 bit are common tools required for this job.

If the sensor is faulty: These are relatively inexpensive and easy to swap out with basic hand tools. Expert Tip: Don't Ignore Secondary Codes DF357 rarely travels alone. You might also see:

DF047 / DF048: These often follow DF357 and indicate that the ABS and ESP systems have been disabled as a precaution.

DF038: Can indicate a broader internal electronic failure if the voltage to the sensors is unstable.

By fixing the mechanical issue at the wheel (usually the ABS ring), these secondary codes typically vanish once cleared with a scan tool.

Is your Renault currently in "Limp Mode," or are you just seeing the warning light for now? Configuration: 90° V10 Displacement: 3

Renault Default Code List DF | PDF | Fuel Injection - Scribd

1. Basic Specifications

Configuration: 90° V10
Displacement: 3.0 liters (approx. 2,993 cc)
Aspiration: Naturally aspirated
Valvetrain: 4 valves per cylinder, double overhead camshafts (DOHC) per bank
Fuel system: Electronic fuel injection (typically Magneti Marelli or similar period ECUs)
Lubrication: Dry sump
Maximum power: Approximately 650–680 bhp at around 12,500–13,000 rpm (depending on tune and year)
Peak torque: Approximately 380–400 Nm
Engine weight: Around 145–150 kg (complete with ancillaries)

5. Diagnostic Procedure

To resolve DF357, follow this diagnostic workflow:

Step 1: Clear the Code Using a diagnostic tool (such as Renault CLIP, PyClip, or a generic OBDII scanner), clear the fault codes.

Result: If the code does not return immediately, it was likely a transient glitch caused by low voltage or a jump start. Monitor the vehicle to see if it returns.

Step 2: Inspect Steering Wheel Controls

Check the "Main" switch (rotary or push-button) for physical damage.
Press every button (Set/+, Res/-, Cancel) to ensure they click and return physically.
Use the diagnostic tool to enter the "Input States" (États) menu for the injection ECU. Watch the live data while pressing the buttons. If a button press does not register on the screen, the switch unit is faulty.

Step 3: Check Battery Voltage

Ensure the battery voltage is above 12.4V when the engine is off and 13.5V–14.5V when running.
Renault ECUs are sensitive to voltage drops; rectify battery issues before replacing parts.

Step 4: Wiring Checks

Inspect the wiring loom under the steering wheel (clock spring/connectors) for damage or pin corrosion.

Retrofit and modernization options

Electronic governor or ECU retrofit for better fuel economy and emissions control
Turbocharging or upgraded turbo (requires matching fuel and cooling systems)
Aftercooler/intercooler for improved power and efficiency (if turbocharged)
Conversion to modern injection systems (complex; typically requires custom engineering)
Emissions control additions (filters, catalytic systems) — often limited by cost/feasibility