ABS light on Q5 FY

Diagnosing the ABS Light on Audi Q5 FY (2018-2024)

The ABS (Anti-lock Braking System) light on your Audi Q5 indicates a potential issue within the ABS system. This guide provides a detailed approach to diagnose and solve the problem.

Tools Required

• OBD-II scanner with ABS compatibility (VAG-COM or similar for Audi).
• Digital Multimeter.
• Basic hand tools (screwdrivers, socket set).

Step 1: Initial Inspection

1. Visual Inspection:
   • Inspect the ABS fuse in the fuse box; refer to the owner’s manual for the exact location.
   • Check for visible damage to the wheel speed sensors and wiring at each wheel.
   • Inspect the brake fluid level and condition. Top up if necessary.

Step 2: OBD-II Scanner Diagnosis

1. Connect OBD-II Scanner:

   • Locate the diagnostic port under the dashboard.
   • Connect the scanner and turn the ignition to the ON position.

2. Retrieve Error Codes:

   • Use the scanner to read ABS-related fault codes.
   • Document all stored codes for reference.

3. Common Error Codes:

   • C0035-C0050: Wheel Speed Sensor issues.
   • C0110: ABS Pump Motor Circuit Fault.
   • C0161: ABS Control Module Fault.

Step 3: Specific Component Testing

1. Wheel Speed Sensors:

   • Inspect each sensor for physical damage or debris.
   • Use a multimeter to check resistance (usually between 1k and 2k ohms).
   • Clean the sensor and reluctor ring if dirty.

2. ABS Control Module:

   • Check electrical connections for corrosion or damage.
   • Use the scanner to perform an actuator test if available.

3. ABS Pump:

   • Listen for the pump operation when the system is activated.
   • Check for stored codes related to the pump motor.

Repair Instructions

Replace Faulty Wheel Speed Sensor

1. Remove the Wheel:

   • Use a jack and jack stands to safely lift the vehicle.
   • Remove the wheel using the appropriate socket size.

2. Replace Sensor:

   • Disconnect the sensor’s electrical connector.
   • Remove the sensor mounting bolt(s) using a socket or Torx bit.
   • Install the new sensor and reconnect the wiring.

3. Reassemble:

   • Reinstall the wheel and torque to specification.
   • Lower the vehicle safely.

Repair or Replace ABS Control Module

1. Access Module:

   • Disconnect the battery’s negative terminal.
   • Remove any covers to access the ABS module.

2. Replace Module:

   • Disconnect all electrical connectors.
   • Unbolt the module from its mounting position.
   • Install the new module and reconnect all connectors.

3. Reprogram/Calibrate:

   • Use the scanner to reprogram and calibrate the new module if needed.

Final Steps

1. Clear Fault Codes:

   • Use the OBD-II scanner to clear all stored fault codes.
   • Perform a test drive to ensure the ABS light remains off.

2. Verify Repair:

   • Ensure proper operation of the ABS system under different braking conditions.

Conclusion

Addressing the ABS light issue on your Audi Q5 FY involves careful diagnosis and the replacement or repair of faulty components. Follow the steps above to ensure a comprehensive approach to resolving the warning light concern. If problems persist, consult with a professional technician or an Audi dealership for further assistance.