LEMON Manuals
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Niro LX
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System Diagnosis (3 Of 6)
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DTC P0420-00: Catalyst System Efficiency Below Threshold (Bank 1)
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System Inspection
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O2 Sensor Inspection
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O2 Sensor Inspection
Ensure that the sensor is securely installed
Check for corrosion on terminals
Check for damaged wiring
Good
Go to "
COMPONENT INSPECTION
" procedure.
No Good
Repair open or short in circuit and then go to "
VERIFICATION OF REPAIR
" procedure.