G4.3 4Pin CAN Bus Speed Sensor Compatible with Bafang BBS Series E-Bike Solve Error Code 21

White background product shot, standalone Bafang CAN bus hall speed sensor with G4.3 blue 4-pin plug and fixed mounting bracket for ebike mid drive motor
Bafang CAN bus speed sensor compatible with BBS01B BBS02B BBS-HD mid motor e-bike, G4.3 blue 4-pin plug, accurate ebike speed sensor replacement kit
4 pin CAN-BUS blue square plug speed sensor connector, match Bafang BBS01B BBS02B BBS-HD mid drive electric bike motor system
G4.3 4Pin CAN Bus Speed Sensor Compatible with Bafang BBS Series E-Bike Solve Error Code 21 - Image 4
G4.3 4Pin CAN Bus Speed Sensor Compatible with Bafang BBS Series E-Bike Solve Error Code 21 - Image 5
3-step working principle of Bafang hall speed sensor, magnet trigger hall sensor send pulse signal to display for real time speed and odometer calculation
Solve Error Code 21 speed sensor error on Bafang ebike, fix loose missing misaligned spoke magnet with replacement CAN bus speed sensor kit
G4.3 4Pin CAN Bus Speed Sensor Compatible with Bafang BBS Series E-Bike Solve Error Code 21 - Image 8
White background product shot, standalone Bafang CAN bus hall speed sensor with G4.3 blue 4-pin plug and fixed mounting bracket for ebike mid drive motor
Bafang CAN bus speed sensor compatible with BBS01B BBS02B BBS-HD mid motor e-bike, G4.3 blue 4-pin plug, accurate ebike speed sensor replacement kit
4 pin CAN-BUS blue square plug speed sensor connector, match Bafang BBS01B BBS02B BBS-HD mid drive electric bike motor system
3-step working principle of Bafang hall speed sensor, magnet trigger hall sensor send pulse signal to display for real time speed and odometer calculation
Solve Error Code 21 speed sensor error on Bafang ebike, fix loose missing misaligned spoke magnet with replacement CAN bus speed sensor kit

G4.3 4Pin CAN Bus Speed Sensor Compatible with Bafang BBS Series E-Bike Solve Error Code 21

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Detail

Bafang CAN Bus Speed Sensor Kit – For BBS01B / BBS02B / BBS-HD Mid Drive E-Bikes

Is your Bafang mid-drive e-bike throwing Error Code 21 (speed sensor fault)? Our official-compatible CAN-BUS speed sensor replacement kit delivers accurate real-time speed & odometer readings, solving loose, missing or misaligned magnet issues once and for all.
Designed exclusively for Bafang CAN-BUS mid-motor systems (BBS01B, BBS02B, BBS-HD/BBS03), this plug-and-play hall sensor uses the standard G4.3 blue 4-pin connector, no complicated programming or extra adapters required. Simply plug in, align the spoke magnet within 15mm of the sensor head, and restore full speed tracking performance for your electric bike.

Bafang CAN-BUS hall speed sensor kit with G4.3 blue 4-pin plug, compatible with BBS01B BBS02B BBS-HD mid mount ebike motor, plug and play speed detector

Full CAN-BUS Compatibility

4-pin blue square CAN-BUS connector perfectly matches Bafang BBS series mid motors, direct plug-and-play installation without modification. Input voltage 4.2V–5.5V, stable signal transmission for consistent speed data.

4-core CAN-BUS blue plug speed sensor connector, perfectly match Bafang BBS01B BBS02B BBS-HD electric bicycle mid drive system, no adapter requiredWhite background full set Bafang ebike speed sensor assembly, includes hall sensor, mounting bracket, metal spoke magnet, connecting wire and plastic zip tiesLabeled breakdown of all accessories for Bafang CAN bus speed sensor, adaptive bracket, hall sensor, CAN cable, spoke magnet and mounting screws included

Complete All-In-One Installation Kit
No need to source separate accessories. Every package includes:
Precise hall speed sensor with pre-wired CAN cable
Adjustable mounting bracket
Metal wheel spoke magnet
Matching mounting screws
Secure cable zip ties

Quick setup tutorial for Bafang ebike speed sensor, alignment requirement less than 15mm between wheel spoke magnet and hall sensor head

Fix Error Code 21 Permanently

The top cause of Error 21 is a poorly aligned or lost magnet. Our kit includes a heavy-duty metal magnet and adjustable bracket, letting you lock the gap under 15mm to eliminate speed sensor error codes entirely.

3-step working principle of Bafang CAN bus speed sensor, magnet trigger hall sensor, transmit pulse signal, display calculate real-time speed and mileage

Accurate Real-Time Speed Detection

Built-in high-sensitivity hall sensor captures pulse signals as the wheel rotates. The controller instantly calculates precise speed, trip distance and total mileage, displayed clearly on your Bafang dashboard.

Troubleshoot Error Code 21 speed sensor error for Bafang ebike, solve missing/loose/misaligned magnet issue with complete speed sensor replacement kit

Simple, Quick Setup
  1. Mount the sensor bracket on your bike frame
  2. Attach the metal magnet to your wheel spoke
  3. Align magnet and sensor with less than 15mm clearance
  4. Plug the blue CAN connector into your motor controller
  5. Power on your e-bike – speed tracking works instantly

Bafang CAN Bus Speed Sensor Kit – For BBS01B / BBS02B / BBS-HD Mid Drive E-Bikes

Is your Bafang mid-drive e-bike throwing Error Code 21 (speed sensor fault)? Our official-compatible CAN-BUS speed sensor replacement kit delivers accurate real-time speed & odometer readings, solving loose, missing or misaligned magnet issues once and for all.
Designed exclusively for Bafang CAN-BUS mid-motor systems (BBS01B, BBS02B, BBS-HD/BBS03), this plug-and-play hall sensor uses the standard G4.3 blue 4-pin connector, no complicated programming or extra adapters required. Simply plug in, align the spoke magnet within 15mm of the sensor head, and restore full speed tracking performance for your electric bike.

Bafang CAN-BUS hall speed sensor kit with G4.3 blue 4-pin plug, compatible with BBS01B BBS02B BBS-HD mid mount ebike motor, plug and play speed detector

Full CAN-BUS Compatibility

4-pin blue square CAN-BUS connector perfectly matches Bafang BBS series mid motors, direct plug-and-play installation without modification. Input voltage 4.2V–5.5V, stable signal transmission for consistent speed data.

4-core CAN-BUS blue plug speed sensor connector, perfectly match Bafang BBS01B BBS02B BBS-HD electric bicycle mid drive system, no adapter requiredWhite background full set Bafang ebike speed sensor assembly, includes hall sensor, mounting bracket, metal spoke magnet, connecting wire and plastic zip tiesLabeled breakdown of all accessories for Bafang CAN bus speed sensor, adaptive bracket, hall sensor, CAN cable, spoke magnet and mounting screws included

Complete All-In-One Installation Kit
No need to source separate accessories. Every package includes:
Precise hall speed sensor with pre-wired CAN cable
Adjustable mounting bracket
Metal wheel spoke magnet
Matching mounting screws
Secure cable zip ties

Quick setup tutorial for Bafang ebike speed sensor, alignment requirement less than 15mm between wheel spoke magnet and hall sensor head

Fix Error Code 21 Permanently

The top cause of Error 21 is a poorly aligned or lost magnet. Our kit includes a heavy-duty metal magnet and adjustable bracket, letting you lock the gap under 15mm to eliminate speed sensor error codes entirely.

3-step working principle of Bafang CAN bus speed sensor, magnet trigger hall sensor, transmit pulse signal, display calculate real-time speed and mileage

Accurate Real-Time Speed Detection

Built-in high-sensitivity hall sensor captures pulse signals as the wheel rotates. The controller instantly calculates precise speed, trip distance and total mileage, displayed clearly on your Bafang dashboard.

Troubleshoot Error Code 21 speed sensor error for Bafang ebike, solve missing/loose/misaligned magnet issue with complete speed sensor replacement kit

Simple, Quick Setup
  1. Mount the sensor bracket on your bike frame
  2. Attach the metal magnet to your wheel spoke
  3. Align magnet and sensor with less than 15mm clearance
  4. Plug the blue CAN connector into your motor controller
  5. Power on your e-bike – speed tracking works instantly

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