Home >> Land Rover >> 2021 >> Defender 90 S >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index DTC: Anti-Lock Brake System Control Module (Abs) -- Defender/L663 >> Diagnostic Trouble Code Index - DTC: Anti-Lock Brake System Control Module (Abs) (G3134779) >> Description And Operation >> Anti-Lock Brake System Control Module (Abs) >> DTC C0031-25: Left Front Wheel Speed Sensor - Signal shape/waveform failure >> Possible Causes