Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> Brakes >> Traction Control >> Vehicle Dynamic Systems >> Diagnosis And Testing >> Anti-Lock Control >> Pinpoint Tests >> Pinpoint Test F: DTC C1233 (LF), C1234 (RF), C1235 (RR), C1236 (LR), Speed Wheel Input Signal Missing >> Possible Causes