C1704 — Right Rear Sensor Circuit Fault #

Note: The label for code C1704 may vary by vehicle manufacturer (OEM). Below are known variations:

• Right Rear Wheel Speed Sensor Circuit Fault (Ford)
• Right Rear Sensor Signal Malfunction (Nissan)
• Right Rear ABS Sensor Circuit Error (Toyota)
• Rear Right Wheel Sensor Circuit Issue (Mazda)

Summary of code C1704 #

Code C1704 indicates a fault in the electrical circuit associated with the right rear wheel speed sensor—a critical component in your vehicle’s anti-lock braking system (ABS) or tire pressure monitoring system (TPMS), depending on the OEM’s design. This sensor monitors the speed or tire pressure at the right rear wheel and sends signals to the vehicle’s control module. When the module detects an abnormal or absent signal, it triggers C1704. While this fault may not immediately affect drivability, it often disables safety features such as ABS or traction control, increasing risk during braking or on slippery roads. Prompt diagnosis and repair are essential to restore full vehicle safety and performance.

Common symptoms for code C1704 #

When C1704 is present, your vehicle will typically exhibit signs of sensor malfunction, which may impact safety systems. Drivers often notice one or more of the following:

• ABS warning light illuminated on the dashboard
• Traction control or stability control lights activated
• Loss of ABS or traction control functionality
• Intermittent or persistent warning chimes
• Unusual braking behavior (rare, but possible if ABS is disabled)

Probable causes for code C1704 #

Most issues leading to C1704 involve electrical faults or physical damage in the right rear sensor circuit. The most frequent causes, in descending order, are:

1. Defective right rear wheel speed sensor (or pressure sensor, depending on system)
2. Damaged or corroded sensor wiring or connector
3. Faulty sensor mounting (misalignment, debris)
4. Open or short circuit in the sensor harness
5. Faulty ABS or TPMS module (rare, but possible)

Step-by-step diagnostic for code C1704 #

Accurate diagnosis ensures you address the root cause and avoid unnecessary parts replacement. Here’s a recommended workflow:

• Step 1: Use an OBD-II/EOBD scan tool to confirm C1704 and check for related codes.
• Step 2: Visually inspect the right rear sensor and its wiring harness for damage, corrosion, or loose connections.
• Step 3: Clean the sensor area, ensuring there’s no debris or rust interfering with the sensor or its mounting surface.
• Step 4: Test sensor output with a multimeter or oscilloscope (refer to OEM specifications for voltage or resistance values).
• Step 5: Check continuity and insulation in the sensor circuit from the sensor connector to the control module.
• Step 6: If wiring and sensor test normal, inspect and test the ABS or TPMS module; substitute with a known-good unit if possible.
• Step 7: Clear the code and test-drive to verify repair.

Possible repairs for code C1704 #

Once you’ve pinpointed the fault, repairs should target the specific cause. Common solutions include:

• Replacing the right rear sensor (wheel speed or pressure sensor, as applicable)
• Repairing or replacing damaged wiring/connectors in the sensor circuit
• Cleaning or realigning the sensor and mounting bracket
• Repairing open/short circuits in the harness
• Replacing the ABS or TPMS module (only after confirming all other components are functional)

Is it safe to drive with code C1704? #

Driving with code C1704 is not recommended for extended periods. While your vehicle may operate normally under most conditions, safety features like ABS and traction control may be disabled, increasing the risk of wheel lockup or loss of stability—especially in wet, icy, or emergency braking situations. For your safety and that of others, have the issue diagnosed and repaired as soon as possible.

Vehicles most commonly affected by code C1704 #

C1704 is most frequently encountered in vehicles equipped with advanced ABS or TPMS systems, especially those from the following OEMs:

• Ford (Focus, Fusion, Escape, Explorer)
• Nissan (Altima, Sentra, Rogue, Murano)
• Toyota (Camry, Corolla, RAV4, Highlander)
• Mazda (Mazda3, Mazda6, CX-5)
• Hyundai, Kia, Honda and other manufacturers with similar sensor systems

Common mistakes & best practices for code C1704 #

Misdiagnosis can lead to unnecessary repairs and persistent issues. To avoid common pitfalls:

• Don’t replace the sensor before thoroughly checking wiring and connectors for damage or corrosion.
• Avoid ignoring the code or clearing it without addressing the root cause.
• Always test sensor output against OEM specifications, as values can vary between models.
• Ensure the sensor is properly seated and free of debris after any repair or inspection.
• Follow a methodical diagnostic process instead of jumping to conclusions.

Quick FAQ for code C1704 #

Need answers fast? Here are some common questions and expert responses:

• Q: Will my ABS work with code C1704 active?
  A: No, the ABS system will typically be disabled to prevent unsafe operation. Traction and stability control may also be affected.
• Q: Can I just clear the code and keep driving?
  A: Clearing the code without repairing the cause will only temporarily remove the warning. The problem will return and safety features will remain offline until fixed.
• Q: Is this an expensive repair?
  A: Costs vary. Replacing a sensor is usually affordable, but wiring or module repairs may be more involved. Accurate diagnosis is key to minimizing expense.