Smart Fortwo ABS Wheel Speed Sensor in US

Your Smart Fortwo ABS wheel speed sensor is the component that makes anti-lock braking possible on your Fortwo. It monitors the rotational speed of each wheel in real time and sends that data to the Smart Fortwo ABS control module, which uses it to prevent wheel lockup during emergency stops. When a sensor fails on your Fortwo, your ABS loses the input it needs. On wet, icy, or gravel road surfaces, the difference between a controlled stop and a skid can come down to whether your Smart Fortwo wheel speed data is reaching the module.

What Is the ABS Wheel Speed Sensor on Your Smart Fortwo

The ABS wheel speed sensor on the Smart Fortwo is an electromagnetic or Hall-effect sensor mounted near each wheel hub or bearing assembly of your Fortwo. It generates an electronic signal as a toothed reluctor ring rotates past it, producing a frequency the Fortwo ABS module interprets as wheel speed. On most modern Smart Fortwo vehicles, this same data feeds the traction control system, electronic stability control, and electronic brake force distribution, making a functioning wheel speed sensor critical to the safe operation of multiple Fortwo systems simultaneously.

Signs of a Failing ABS Wheel Speed Sensor on the Smart Fortwo

• ABS warning light on your Smart Fortwo dashboard, the most common first indicator of a failing sensor
• Traction control or stability control warning light illuminated alongside the Fortwo ABS light
• ABS activating on your Smart Fortwo during normal stops at low speed where it should not engage
• Complete ABS deactivation on the Fortwo, wheels lock under hard braking on wet or icy roads
• Speedometer on your Smart Fortwo reading erratically or dropping to zero at speed
• Fault codes in the C0035 to C0050 range stored in the Smart Fortwo ABS control module

Passive vs. Active ABS Sensors for the Smart Fortwo

GeoBrakes stocks both passive and active ABS wheel speed sensors for the Smart Fortwo. Passive sensors use an analog signal and are found on older Fortwo vehicles and many trucks still in service. Active Hall-effect sensors require a small power supply and output a clean digital signal, offering greater accuracy at very low speeds. Active sensors are standard on most Smart Fortwo vehicles manufactured after the mid-2000s and are required for full compatibility with modern Fortwo traction and stability control systems.

Why GeoBrakes for the Smart Fortwo ABS Wheel Speed Sensor

Signal accuracy matters as much as fitment with Smart Fortwo wheel speed sensors. A sensor that generates the correct frequency for your Fortwo ABS module ensures consistent ABS calibration, proper traction control thresholds, and accurate stability control response on your Smart Fortwo. Every sensor in the GeoBrakes catalogue is matched to the Smart Fortwo through our vehicle selector, with front and rear positions listed separately to eliminate position errors on your Fortwo.

Frequently Asked Questions - Smart Fortwo ABS Wheel Speed Sensor

Can I drive my Smart Fortwo with a faulty ABS wheel speed sensor?

You can drive the Smart Fortwo with a failed ABS sensor, but the anti-lock braking system on your Fortwo will be completely disabled. On icy or wet American roads, this significantly increases stopping distances and the risk of losing steering control during hard braking on your Smart Fortwo. Replacing a failed sensor promptly is strongly recommended, particularly before winter.

How do I find the right ABS sensor for my Smart Fortwo?

Use the GeoBrakes vehicle selector and enter the Smart Fortwo year, make, and model. The system displays only the sensors confirmed to fit the Smart Fortwo, with front and rear positions listed separately. Select the position matching the sensor you are replacing on your Fortwo to avoid receiving the wrong unit.

Do I need to replace all four ABS sensors on my Smart Fortwo at the same time?

No. ABS wheel speed sensors on the Smart Fortwo are independent components and only the failed unit needs to be replaced. However, if your Fortwo has high mileage and one sensor has failed, it is worth visually inspecting the connectors on the other Smart Fortwo sensors for corrosion while the wheel is removed.