Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY2001SABLE LS, 4D SEDAN, 3.0 U, AX4SREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEM CONTROLDIAGNOSTIC TESTSTEST G: DTC C1222 - WHEEL SPEED SIGNAL MISMATCH
2001 Mercury Sable LS, 4D Sedan, 3.0 U, AX4S
Test G: DTC C1222 - Wheel Speed Signal Mismatch
2001 Mercury Sable LS, 4D Sedan, 3.0 U, AX4SSECTION Test G: DTC C1222 - Wheel Speed Signal Mismatch
NOTE:
Any other wheel speed DTC must be diagnosed before proceeding. DTC C1222 can be set during certain repair procedures with key on, vehicle towing, on vehicle wheel balance or dynamometer testing with no actual fault.
- Check Vehicle Components
Check for correct tire size, front to rear and side to side. Check for excessive bearing end play. Check wheel speed sensor for bent or damaged sensor ring or missing teeth. Repair any problems. Clear DTC nad repeat self-test. If all conditions are okay, go to next step. - Test Drive Vehicle
Clear codes and turn ignition off. Turn ignition on and test drive vehicle at speed greate than 15 MPH. Retrieve DTCs. If DTC C1222 is retrieved, replace ECU. Repeat self-test. If another DTC is retrieved, see ON-DEMAND SELF-TEST DIAGNOSTIC TROUBLE CODE DEFINITIONS table. If no DTCs are retrieved, system is operating normally.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.