Fault code C1116 – a step-by-step guide to diagnosing and fixing it

Error code C1116 is displayed and the check engine light is on - what does this mean?

The DTC C1116 is recognized by the OBD/EOBD system and indicates a fault in the ABS system, specifically in the front left wheel speed sensor circuit. This trouble code affects the anti-lock braking system and can impair driving safety. The exact designation may vary slightly for different manufacturers, but generally refers to problems with the front left wheel speed sensor.

What causes can this error code have?

• Defective front left wheel speed sensor
• Damaged or interrupted sensor cable
• Corroded or loose plug connections
• Dirty or damaged sensor ring (reluctor ring)
• Defective ABS control unit
• Mechanical damage to the wheel bearing
• Incorrect air gap setting between sensor and reluctor ring
• Short circuit in the sensor circuit

What symptoms occur in parallel with fault code C1116?

• ABS indicator light: The ABS warning light in the dashboard lights up continuously
• ESP malfunction: The electronic stability program is not working properly
• Braking behavior: ABS function is restricted or completely deactivated
• Warning messages: Error messages in the display regarding ABS/ESP system
• Locking wheels: The wheels may lock under heavy braking
• Traction control: ASR/TCS system may be impaired

How can the problem with fault code C1116 be rectified?

• Repairing fault code C1116 requires a systematic diagnosis of the ABS components.
• Replace the front left wheel speed sensor completely and calibrate it correctly
• Check the entire length of the sensor cable and replace if damaged
• Clean plug connections, check for corrosion and replace if necessary
• Check the sensor ring (reluctor ring) for damage and replace if necessary
• Test ABS control unit with diagnostic device and replace if defective
• Check wheel bearings for play and replace if excessively worn
• Adjust air gap between sensor and reluctor ring according to manufacturer's specifications
• Measure the entire sensor circuit for continuity and short circuits