Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Kia Niro Plug-In Hybrid EXFACTORY OEM SERVICE PROCEDURE
Engine Control System Diagnosis (PHEV) (3 Of 6)
- DTC Index
- DTC P0300-00: Random/Multiple Cylinder Misfire Detected
- DTC P0301-00: Cylinder 1-Misfire Detected
- DTC P0302-00: Cylinder 2-Misfire Detected
- DTC P0303-00: Cylinder 3-Misfire Detected
- DTC P0304-00: Cylinder 4-Misfire Detected
- DTC P0315-00: Crankshaft Position System Variation Not Learned
- DTC P0326-00: Knock Sensor 1 Circuit Range/Performance (Bank 1)
- DTC P0335-00: Crankshaft Position Sensor 'A' Circuit
- DTC P0336-00: Crankshaft Position Sensor 'A' Circuit Range/Performance
- DTC P0340-00: Camshaft Position Sensor 'A (Intake)' Circuit (Bank 1 Or Single Sensor)
- DTC P0341-00: Camshaft Position Sensor 'A' (Intake) Circuit Range/Performance (Bank 1)
- DTC P0351-00: Ignition Coil 'A' Primary/Secondary Circuit
- DTC P0352-00: Ignition Coil 'B' Primary/Secondary Circuit
- DTC P0353-00: Ignition Coil 'C' Primary/Secondary Circuit
- DTC P0354-00: Ignition Coil 'D' Primary/Secondary Circuit
- DTC P0365-00: Camshaft Position Sensor 'B (Exhaust)' Circuit Malfunction (Bank1)
- DTC P0366-00: Camshaft Position Sensor 'B' (Exhaust) Circuit Range/Performance (Bank 1)
- DTC P0401-00: EGR 'A' Flow Insufficient Detected
- DTC P0404-00: EGR 'A' Control Circuit Range/Performance
- DTC P0405-00: EGR Sensor 'A' Circuit Low
- DTC P0406-00: EGR Sensor 'A' Circuit High
- DTC P0420-00: Catalyst System Efficiency Below Threshold (Bank 1)
- DTC P043E-00: EVAP System Leak Detection Reference Orifice Low Flow
- DTC P043F-00: EVAP System Leak Detection Reference Orifice High Flow
- DTC P0441-00: Evaporative Emission System Incorrect Purge Flow
- DTC P0444-00: Evaporative Emission System-Purge Control Valve Circuit Open
- DTC P0445-00: Evaporative Emission System-Purge Control Valve Circuit Shorted
- DTC P0447-00: Evaporative Emission System - Vent Control Circuit Open
- DTC P0448-00: Evaporative Emission System - Vent Control Circuit Shorted
- DTC P0451-00: Evaporative Emission System-Pressure Sensor Range/Performance
- DTC P0452-00: Evaporative Emission System-Pressure Sensor Low Input
- DTC P0453-00: Evaporative Emission System-Pressure Sensor High Input
- DTC P0454-00: Evaporative Emission System-Pressure Sensor/Switch Intermittent
- DTC P0455-00: Evaporative Emission System-Leak Detected (Large Leak)
- DTC P0456-00: Evaporative Emission System-Leak Detected (Very Small Leak)
- DTC P0461-00: Fuel Level Sensor 'A' Circuit Range/Performance
- DTC P0462-00: Fuel Level Sensor 'A' Circuit Low Input
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.