Sprinter 907 ABS Light Stays On? Start With Wheel Speed Sensors

What the ABS warning light means on a Sprinter 907

If your Mercedes-Benz Sprinter 907 has the amber ABS light on continuously, the ABS module has found a fault and switched the anti-lock braking system off. In most cases the brakes still work normally, but you lose ABS, ESP, traction control, and sometimes hill-start assist. The first step is not to guess at parts but to read the fault codes from the ABS control unit. A wheel speed sensor fault is the most common reason, especially on vans that see rain, salt, mud, or high mileage.

Most likely causes and what to check first

• Wheel speed sensor: A failed or dirty sensor at one wheel is the usual suspect. Live data showing one wheel dropping to zero or jumping erratically confirms it.
• Wiring and connectors: The harness near the strut, subframe, or rear axle can chafe, corrode, or fill with water. Inspect the connector pins and flex the harness while watching live data.
• Tone ring or reluctor ring: Cracks, rust, missing teeth, or metal debris on the ring can confuse the sensor. On the 907, this is often found with the sensor removed or the wheel off.
• Wheel bearing play: Excess play changes the sensor air gap and can trigger the light. Check for noise, roughness, or movement in the hub.
• ABS module or pump: Less common, but internal faults, low voltage, or a poor ground can set codes. Do not replace it until sensor wiring and signals are proven good.

Can you keep driving with the ABS light on?

In most cases, yes, you can drive carefully to a workshop if the brake pedal feels normal and the red brake warning light is not on. Remember that ABS and stability control are disabled, so leave extra stopping distance and avoid hard braking on wet, icy, or loose surfaces. If the pedal pulses, sinks, feels hard, or you hear grinding, or if the red brake light appears, stop driving and get it towed. A quick diagnostic scan and a live wheel-speed test will usually identify the faulty sensor or circuit within minutes.

This material is AI-generated and for informational purposes only — it does not replace an in-person diagnosis by a qualified mechanic.