Troubleshooting steps
Diagnose P0420 using service manual, check related sensors and wiring, repair or replace faulty components
Motorcycle Diagnostic Codes
P0420 – Catalyst System Efficiency Below Threshold (Bank 1)
Catalyst System Efficiency Below Threshold (Bank 1)
Details
Catalyst System Efficiency Below Threshold (Bank 1) detected on Harley-Davidson motorcycle. This diagnostic trouble code indicates a problem that requires attention.
Error typeerror
MeaningCatalyst System Efficiency Below Threshold (Bank 1)
Typical causesSensor failure, wiring issue, component malfunction, system fault
SolutionsDiagnose P0420 using service manual, check related sensors and wiring, repair or replace faulty components
Severitymedium
Catalog references
Where this appears
Harley-DavidsonP0420
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What does P0420 mean on Harley-Davidson?
P0420 on Harley-Davidson indicates catalyst system efficiency below threshold (bank 1). Consult service manual for specific diagnosis procedures.
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