C1145 Mercury Code - Right Front Wheel Speed Sensor Input Circuit Failure
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 Right Front Wheel Speed Sensor, Right Front Wheel Speed Sensor harness is open or shorted, Right 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
- C1145 Mercury indicates Right Front Wheel Speed Sensor Input Circuit Failure.
- Common causes
- Common causes include Faulty Right Front Wheel Speed Sensor, Right Front Wheel Speed Sensor harness is open or shorted, Right 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 C1145 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 C1145 Mercury?
- Faulty Right Front Wheel Speed Sensor
- Right Front Wheel Speed Sensor harness is open or shorted
- Right Front Wheel Speed Sensor circuit poor electrical connection
How to Fix the DTC C1145 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 C1145 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.
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Frequently Asked Questions about C1145 Mercury Code
1. What does the OBDII code C1145 mean for a Mercury vehicle?
C1145 indicates a failure in the right front wheel speed sensor input circuit, which is critical for the proper functioning of the ABS and traction control systems.
2. What are the common symptoms of code C1145 in a Mercury?
Symptoms may include the ABS warning light or traction control light turning on, reduced braking performance, or erratic ABS activation.
3. What causes the C1145 code in Mercury vehicles?
Common causes include a faulty right front wheel speed sensor, damaged wiring or connectors, corroded terminals, or issues with the ABS control module.
4. Can I drive my Mercury with the C1145 code active?
While you can drive the vehicle, it is not recommended, as the ABS and traction control systems may not function properly, increasing the risk of skidding or losing control in slippery conditions.
5. How do I diagnose the C1145 code in a Mercury?
Start by visually inspecting the right front wheel speed sensor, its wiring, and connectors for damage or corrosion. Use a multimeter or scan tool to test the sensor's signal and check for continuity in the circuit.
6. How can I fix the C1145 code on my Mercury?
Repairs may include replacing the right front wheel speed sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or in rare cases, replacing the ABS control module.
7. How much does it cost to fix the C1145 code on a Mercury?
The cost typically ranges from $100 to $300 depending on whether the issue is with the sensor, wiring, or connectors. ABS module repairs may cost significantly more.
8. Can a dirty wheel speed sensor cause the C1145 code?
Yes, excessive dirt or debris on the right front wheel speed sensor or its tone ring can interfere with signal transmission and trigger the code.
9. Will clearing the C1145 code with a scan tool resolve the problem?
Clearing the code will turn off the warning lights temporarily, but the issue will return if the underlying problem is not fixed.
10. How can I prevent the C1145 code from occurring again?
Perform regular maintenance, including checking for damaged wiring, cleaning sensors, and ensuring connectors are free of corrosion, to prevent recurrence of this issue.
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