Bosch (Purion, Intuvia, Kiox, Nyon) · ABS
Bosch (Purion, Intuvia, Kiox, Nyon) error code 821
ABS is getting implausible speed signals from the front wheel, often due to the sensor disc
What you can check
Check that the sensor disc is in place and both wheels are the same size. Restart the bike and ride for at least two minutes; the ABS light should go out.
Dealer if the fault comes back
Trolda cannot read Bosch (Purion, Intuvia, Kiox, Nyon) motors yet. The code list is here to help you anyway.
Same part: ABS
Sources
Explained in Trolda's own words from the manufacturer's public documentation. Trolda is not affiliated with the manufacturer. If in doubt, ask your dealer.
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