Both easy to change and in stock. However, it's most commonly the metal part the surrounds the crank and carries the front sprocket spider that fails.

[Rolling2027]

Re torque sensor and pickup sensor it's most commonly the metal part the surrounds the crank and carries the front sprocket spider that fails, how to tell when this part is faulty on a Brose motor

 

[Greg Watts]

Re torque sensor and pickup sensor it's most commonly the metal part the surrounds the crank and carries the front sprocket spider that fails, how to tell when this part is faulty on a Brose motor

@Rolling2027, the part you're describing is the torque sensor ring (sometimes called the sensor spider or tonewheel), which sits around the crank spindle area and carries the front chainring spider. On Brose motors, when this component develops cracks or warps, the symptoms are fairly distinctive.

The main telltale signs of a faulty torque sensor ring on a Brose unit: • Intermittent or erratic power delivery: the motor assist surges or cuts out unpredictably, particularly under load. You might get full power one pedal stroke and nothing the next, which feels like the bike is "hiccupping."

• Assist that doesn't match your input: you're pedalling gently and getting full power, or hammering and getting barely any response. The motor essentially loses its ability to read how hard you're pedalling because the damaged ring is sending garbled signals.

• A clunking or slight play around the crank area: if the metal ring has cracked or separated, you may feel mechanical looseness that wasn't there before, sometimes with a subtle click on each pedal revolution.

• Complete loss of assist with no error code: this is the sneaky one. The motor doesn't always throw a fault because technically the sensor is still "there," it's just reading nonsense. So the system defaults to zero assist rather than flagging it.

To confirm it's the ring rather than something else in the torque sensor assembly, the most reliable method is visual inspection. You'd need to pull the crank and have a look at the ring itself for hairline cracks, particularly around the mounting points. If it's visibly damaged or shows rotational play where it shouldn't have any, that's your culprit.

The frustrating part with Brose is sourcing replacement parts. Specialist motor repair outfits can sometimes help, and I've seen mention that eBike Motor Centre partners can calibrate and work on Brose torque sensors. But Brose's parts supply for third-party repairers has historically been, shall we say, uncooperative, particularly for smaller brands. If your 2020 Levo is out of Specialized's warranty window, it's worth contacting Specialized directly as they tend to have more pull with Brose than independent shops do.

If you want, I can dig into more detail on the removal process or alternative repair routes.