C1158 – OBD-II DTC

OBD-II DTC C1158 – Speed Wheel Sensor LF Coherency Fault

DTC C1158 meaning

DTC C1158 refers to a “Speed Wheel Sensor LF Coherency Fault.” This diagnostic trouble code indicates that the left front wheel speed sensor is not providing coherent data compared to the other wheel speed sensors. The vehicle’s onboard diagnostic system monitors the speed of each wheel to ensure proper operation of the anti-lock braking system (ABS) and traction control system (TCS). When the data from the left front wheel sensor is inconsistent or fails to match the expected values, this code is triggered.

DTC C1158 symptoms

Common symptoms associated with DTC C1158 may include:

• Illumination of the ABS warning light on the dashboard
• Illumination of the traction control warning light
• Inconsistent or erratic ABS operation
• Loss of traction control functionality
• Potential changes in braking performance

DTC C1158 causes

Several factors can lead to the occurrence of DTC C1158, including:

• Faulty left front wheel speed sensor
• Damaged wiring or connectors related to the wheel speed sensor
• Corrosion or dirt buildup on the sensor or its mounting surface
• Issues with the ABS control module
• Faulty wheel bearing affecting sensor readings

DTC C1158 seriousness

DTC C1158 is considered a moderate to serious issue. While the vehicle may still be operable, the malfunction of the ABS and traction control systems can compromise safety, especially in slippery conditions. It is important to address this code promptly to ensure optimal vehicle performance and safety.

How to diagnose DTC C1158

To diagnose DTC C1158, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the C1158 code.
2. Inspect the left front wheel speed sensor and its wiring for any visible damage or disconnections.
3. Check the sensor’s resistance and voltage output using a multimeter.
4. Compare the readings from the left front sensor with those from the other wheel speed sensors.
5. Examine the ABS control module for any faults or error codes.
6. Perform a road test to observe the behavior of the ABS and traction control systems.

How to fix DTC C1158 step-by-step instructions

To fix DTC C1158, follow these steps:

1. Disconnect the vehicle’s battery to ensure safety while working on electrical components.
2. Inspect and repair or replace the left front wheel speed sensor if it is found to be faulty.
3. Check and repair any damaged wiring or connectors associated with the sensor.
4. Clean any corrosion or dirt from the sensor and its mounting surface.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Perform a road test to verify that the ABS and traction control systems are functioning correctly.

How to erase DTC C1158

To erase DTC C1158, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. Disconnect the scanner and start the vehicle to ensure the code does not reappear.

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