The Renault fault code (hex code 1835) is primarily defined as a fault with the Thermoplunger Relay No. 2 within the diesel injection system.
This fault typically indicates an electrical issue—such as a short circuit to earth, a short circuit to +12V, or an open circuit—in the relay circuit responsible for controlling the thermoplungers (heating elements used to warm engine coolant in cold weather for faster cabin heating and better combustion). Variations of DF104
Depending on the specific Renault model and the system being scanned (e.g., Engine vs. Airbag vs. ABS), the code can sometimes point to different communication or sensor issues: Diesel Injection: Thermoplunger Relay No. 2. Airbag System:
CAN communication error or water intrusion in the airbag module. ABS System:
Fault related to the left rear wheel speed sensor or its circuit. Troubleshooting the Thermoplunger Fault
If your diagnostic tool reports DF104 in the injection system, follow these steps: Check Fuses:
Inspect the fuse for the thermoplunger relays in the engine compartment fuse box. Inspect Connectors:
Look for oxidation, bent pins, or loose connections at the relay and the injection computer. Test the Relay: renault df104
Verify the relay's operation by checking for continuity and insulation from earth. Wiring Inspection:
Check the wiring harness for signs of wear, melted insulation, or damage. Context on "Develop a Deep Feature"
There is no standard Renault diagnostic term "develop a deep feature" associated with code DF104. This may be a mistranslation or a specific phrase from a third-party diagnostic tool's software (like Renault CAN Clip
) referring to an "assisted fault finding" or "reprogramming" procedure. Renault model (e.g., ABS, Engine, Airbag) are you currently diagnosing?
Hi I recently posted a problem with my Renault Master. ... - Facebook
In the world of Renault diagnostics, DF104 isn't a vintage car model or a secret project—it is a specific fault code that often turns a routine drive into a bit of a mystery for owners of vehicles like the Renault Clio, Megane, or Scenic. The "Case of the Missing Signal"
The story of DF104 usually begins on a crisp morning. You start your Renault, and suddenly, the dashboard glows with a "Check Injection" or "ESP/ABS" warning. When a mechanic plugs in a diagnostic tool, the screen reveals the culprit: DF104 – Multiplex network / CAN bus communication fault. The Renault fault code (hex code 1835) is
In simpler terms, your car’s computers have stopped talking to each other. Think of it like a group project where the team leader (the ECU) is shouting instructions, but the team members (the ABS or Power Steering modules) have their fingers in their ears. Common "Plot Twists" in the DF104 Story:
The Hidden Corrodent: Often, the "villain" is a tiny bit of green corrosion on the wiring harness or a loose connector under the fuse box (UPC). Water ingress is a frequent guest star in this drama, especially after a heavy rain or a car wash.
The Weak Link: Sometimes the story ends quickly with a failing battery. If the voltage drops too low during startup, the "multiplex network" panics and throws the DF104 code simply because it didn't have enough power to "speak" clearly.
The Brake Switch Cameo: Surprisingly, many Renault owners find that a faulty brake pedal switch triggers this network error, as the car struggles to verify if you're actually stepping on the brakes. How the Story Usually Ends
For most, the resolution involves a technician cleaning the electrical contacts or replacing a blown fuse in the engine bay. If you're seeing this code, check out guides from Renault Forums or diagnostic tips from OBD2 Explainer to help narrate your car's path back to a clear dashboard.
Are you seeing this code on your dashboard right now, or are you looking for a creative fictional story about a car with this designation?
It sounds like you're referring to the Renault DF104 — a somewhat rare and unusual diesel engine from the early 1980s. Claas Tractor Parts: When Claas took over the
Since you mentioned "long story," I imagine you might have encountered one in an old tractor, a boat, a generator, or maybe even a Renault 20 or 30 car (though that's more likely the Douvrin engine). To save you time digging through fragmented forum posts, here’s a concise rundown of what the DF104 is, what it was used in, and the common issues people face.
When people hear "Renault," they usually think of the iconic 4CV, the hatchback-breaking R5, or the Espace. But the true backbone of Renault’s industrial success lay in its green machines: the tractors. Buried deep in the engine manuals is the Renault DF104—a diesel engine that defined an era of farming reliability.
Farmers love the DF104 because it doesn't scream; it pulls. At 1,500 RPM, it produces peak torque, making it perfect for plowing or running a PTO (Power Take-Off) at constant speed.
The million-dollar question for owners of a Renault DF104 is: Can I still get parts?
Thanks to the merger history of Renault Agriculture, the situation is surprisingly good.
Pro Tip: When searching online, use the French spelling: "Moteur Renault DF104 pièces détachées" (Spare parts). You will have better luck on French eBay (eBay.fr) or agricultural forums.
The Renault DF104 is a naturally aspirated, inline, four-cylinder diesel engine produced by the French manufacturer Renault Agriculture (then part of the broader Renault Industrial Vehicles division, later becoming a part of Claas and Volvo). Produced primarily throughout the 1970s and early 1980s, the DF104 was a member of the larger “D” family of engines, known for their simplicity and durability.
The core identity of the DF104:
Unlike its bigger brother, the Renault DF120 (a 5.5L six-cylinder), the DF104 was designed for compact tractors and light industrial machinery where fuel economy and low-end grunt mattered more than outright speed.