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 Rio LXFACTORY OEM SERVICE PROCEDURE
DTC Index
DTC INDEX
| DTC | Description |
|---|---|
| DTC P0406 | 00: Exhaust Gas Recirculation Sensor A Circuit High |
| DTC P0420 | 00: Catalyst System Efficiency Below Threshold (Bank 1) |
| DTC P042E | 00: Exhaust Gas Recirculation 'A' Control Stuck Open |
| DTC P042F | 00: Exhaust Gas Recirculation 'A' Control Stuck Closed |
| DTC P0442 | 00: Evaporative Emission System-Leak detected (small leak) |
| DTC P0444 | 00: Evaporative Emission System-Purge Control Valve Circuit Open |
| DTC P0449 | 00: Evaporative Emission System - Vent Valve/Solenoid Circuit |
| 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 P0455 | 00: Evaporative Emission System-Leak detected (Large leak) |
| DTC P0456 | 00: Evaporative Emission System-Leak detected (very small leak) |
| DTC P0458 | 00: Evaporative Emission System Purge Control Valve Circuit Low |
| DTC P0459 | 00: Evaporative Emission System Purge Control Valve Circuit High |
| DTC P0462 | 00: Fuel Level Sensor 'A' Circuit Low Input |
| DTC P0463 | 00: Fuel Level Sensor 'A' Circuit High Input |
| DTC P0489 | 00: Exhaust Gas Recirculation Control Circuit Low |
| DTC P0490 | 00: Exhaust Gas Recirculation Control Circuit High |
| DTC P0498 | 00: Evaporative Emission System Vent Valve Control Circuit Low |
| DTC P0499 | 00: Evaporative Emission System Vent Valve Control Circuit High |
| DTC P049D | 00: EGR 'A' Control Position Exceeded Learning Limit |
| DTC P04DF | 00: EVAP System Purge Control Valve 'A' Performance/Stuck Open |
| DTC P04E0 | 00: EVAP System Purge Control Valve 'A' Stuck Closed |
| DTC P0504 | 00: Brake Switch 'A'/'B' Correlation |
| DTC P0506 | 00: Idle Air Control System- RPM Lower than Expected |
| DTC P0507 | 00: Idle Air Control System- RPM Higher than Expected |
| DTC P050A | 00: Cold Start Idle Air Control System Performance |
| DTC P050B | 00: Cold Start Ignition Timing Performance |
| DTC P0532 | 00: A/C Refrigerant Pressure Sensor 'A' Circuit Low Input |
| DTC P0533 | 00: A/C Refrigerant Pressure Sensor 'A' Circuit High 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.