AutoCodes – Mercury – C1299 Mercury

C1299 Mercury Code - Wheel Speed Left Rear Signal Fault

Quick Answer

The wheel speed sensor and sensor ring generate a square wave signal to the Anti-Lock Brake System (ABS) Module that is proportional to wheel speed. Common causes include Wheel Speed Sensor Ring, Faulty Wheel Speed Sensor, Wheel Speed Sensor harness is open or shorted. 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: C1299 Mercury indicates Wheel Speed Left Rear Signal Fault.
Common causes: Common causes include Wheel Speed Sensor Ring, Faulty Wheel Speed Sensor, Wheel Speed Sensor harness is open or shorted.
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.

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Code Popularity 1,184

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 04, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code C1299 Mercury Description

The wheel speed sensor and sensor ring generate a square wave signal to the Anti-Lock Brake System (ABS) Module that is proportional to wheel speed. The ABS module compares wheel speed inputs from all wheel speed sensors to determine an impending wheel lockup. The ABS Module monitors the Wheel Speed Sensor. The ABS Module sets the OBDII code when the Wheel Speed Sensor is not to factory specifications.

OBDII Code C1299 Mercury - Wheel Speed Left Rear Signal Fault - AutoCodes.com — C1299 Mercury Code - Wheel Speed Left Rear Signal Fault

What does this mean?

What are the Possible Causes of the DTC C1299 Mercury?

Wheel Speed Sensor Ring
Faulty Wheel Speed Sensor
Wheel Speed Sensor harness is open or shorted
Wheel Speed Sensor circuit poor electrical connection
Faulty Anti-Lock Brake System (ABS) Module

How to Fix the DTC C1299 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 does this mean?

Code Tech Notes

Incorrect tire size or tire pressure can set these DTCs as well. DTCs set in the ignition cycle can only be cleared by cycling the ignition off and on once the fault has been corrected.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1299 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.