C1158 Mercury Code - Left Front Wheel Speed Sensor Input Signal Erratic
Quick Answer
The ABS module receives wheel speed readings from each wheel speed sensor and processes this information to determine if an ABS event is necessary. Common causes include Faulty Left Front Wheel Speed Sensor, Left Front Wheel Speed Sensor harness is open or shorted, Left Front Wheel Speed Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- C1158 Mercury indicates Left Front Wheel Speed Sensor Input Signal Erratic.
- Common causes
- Common causes include Faulty Left Front Wheel Speed Sensor, Left Front Wheel Speed Sensor harness is open or shorted, Left Front Wheel Speed Sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code C1158 Mercury Description
The active wheel speed sensor generates a signal that is sent to the ABS module. The wheel speed sensor circuitry connects to the ABS module through 2 wires and a connector at each wheel speed sensor. When the ignition is turned to the RUN position, the ABS module carries out a self-test by sending a reference voltage to all of the wheel speed sensors through their circuitry to determine if they are functional.
The ABS module continuously monitors and compares the rotational speed of each wheel and when it detects an impending wheel lock, modulates brake pressure to the appropriate brake caliper. This is accomplished by triggering the hydraulic control unit (HCU) to open and close the appropriate solenoid valves. Once the affected wheel returns to normal speed, the ABS module returns the solenoid valves to their normal position and normal (base) braking resumes.
What are the Possible Causes of the DTC C1158 Mercury?
- Faulty Left Front Wheel Speed Sensor
- Left Front Wheel Speed Sensor harness is open or shorted
- Left Front Wheel Speed Sensor circuit poor electrical connection
How to Fix the DTC C1158 Mercury?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the C1158 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the C1158 Mercury code?
Need more information on how to fix the C1158 Mercury code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the C1158 Mercury code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about C1158 Mercury Code
1. What are the common symptoms of OBDII code C1158 in a Mercury?
- Common symptoms include the ABS warning light coming on, traction control issues, and erratic speedometer readings.
2. What causes the OBDII code C1158 in a Mercury?
- The code C1158 is typically caused by a malfunction in the left front wheel speed sensor or its wiring.
3. How can I diagnose the OBDII code C1158 in my Mercury?
- Diagnosing code C1158 involves checking the left front wheel speed sensor for proper connection, wiring integrity, and sensor functionality using a diagnostic scan tool.
4. Can I drive my Mercury with the OBDII code C1158 present?
- It is not recommended to drive your Mercury with code C1158 present, as it can affect the proper operation of the ABS and traction control systems.
5. How can I repair the OBDII code C1158 in my Mercury?
- Repairing code C1158 involves inspecting and potentially replacing the left front wheel speed sensor and correcting any wiring issues.
6. Are there any DIY tips for fixing the OBDII code C1158 in a Mercury?
- DIY tips include checking the sensor connection, cleaning the sensor mounting area, and inspecting the wiring for damage before replacing the sensor if necessary.
7. Will resetting the OBDII code C1158 make it go away permanently?
- Resetting the code may temporarily turn off the warning light, but if the underlying issue with the left front wheel speed sensor is not resolved, the code is likely to reappear.
8. Can extreme weather conditions contribute to triggering the OBDII code C1158 in a Mercury?
- Yes, extreme weather conditions can affect the performance of the wheel speed sensor and potentially trigger code C1158 in a Mercury.
9. How long does it typically take to repair the OBDII code C1158 in a Mercury?
- The repair time for code C1158 can vary depending on the extent of the issue, but it usually takes around 1-2 hours to diagnose and replace the left front wheel speed sensor.
10. Is it necessary to visit a mechanic to fix the OBDII code C1158, or can I do it myself?
- While some DIY enthusiasts may be able to tackle the repair themselves, it is recommended to consult a qualified mechanic for proper diagnosis and repair of OBDII code C1158 in a Mercury.
Discuss the causes and fixes for C1158 Mercury OBDII Code
Code C1158 Mercury comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
