Marcel started with the basics. He hoisted the van and pulled the rear wheels, scrubbing the ABS rings until the metal teeth shone like a new saw blade. He cleared the code and turned the key. The lights stayed off for exactly thirty seconds—long enough for a sigh of relief—before the red glow returned with a mocking chime.
Some owners have had success removing the electronic portion of the ABS block (the motor side) and cleaning the internal contact points. Carbon dust or oxidation here is a known "silent" killer of these modules. The "Tunnel" Search: renault df104
On some models equipped with ESP (like the Espace IV or Mégane II), DF104 indicates an internal electrical fault in the Combined Sensor Marcel started with the basics
However, DF104 can also indicate internal component failure, which is more severe. The electric motor within the pump assembly uses carbon brushes. Like any electric motor, these brushes wear down over time. When they become too short or begin to stick, the electrical contact is interrupted, causing the pump to stutter or fail. Additionally, the position sensor or the interface ECU itself can fail, losing communication The lights stayed off for exactly thirty seconds—long
: If it's a thermoplunger issue, the engine might take longer to reach operating temperature in cold weather. Top Causes of DF104 Water Intrusion
To understand DF104, one must first understand the system it monitors. Unlike traditional hydraulic power steering, which is driven by a belt connected to the engine, and unlike modern fully electric systems, many Renault models (such as the Clio III, Modus, Megane, and various Dacia models) utilize an Electro-Hydraulic Power Steering (EHPS) pump. This unit is a self-contained module: an electric motor drives a hydraulic pump, which then provides pressure to the steering rack. The vehicle’s computer, specifically the Power Steering Interface Unit or the ECU, must constantly monitor the pump's operation. When the system detects a discrepancy in this operation—be it electrical, thermal, or hydraulic—it logs the code DF104.