Heavy Duty WHT003858 Rear Right ABS Wheel Speed Sensor Fit Octavia On a Skoda Octavia 1Z (the Mk2, 2004–2013), the rear wheel-speed sensors are tiny Hall-effect probes pressed into the rear knuckle — no cable, just a 77 mm black body with a 2-pin D-shaped plug. When the tip fouls with brake dust, the plug sweats, or the tone ring on the hub throws a tooth, you get the ABS and ESP lamps, a speedo that flickers, and a rear-right code (often C0034 / C0037 family) that clears on