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.
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HOMESERVICE MANUALSHYUNDAI2003SONATA LX, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSENGINE CONTROLS - SYSTEM & COMPONENT TESTING
2003 Hyundai Sonata LX, Standard
Engine Controls - System & Component Testing
2003 Hyundai Sonata LX, StandardSECTION Engine Controls - System & Component Testing
- Introduction
- Computerized Engine Controls
- Sensors & Switches
- Notes
- Sensors
- Notes
- Acceleration Sensor
- Camshaft Position (CMP) Sensor
- Crankshaft Position (CKP) Sensor
- Engine Coolant Temperature (ECT) Sensor
- Fuel Tank Pressure (FTP) Sensor
- Heated Oxygen Sensor (HO2S)
- Heated Oxygen Sensor (HO2S) Heater
- Intake Air Temperature (IAT) Sensor
- Knock Sensor (KS)
- Manifold Absolute Pressure (MAP) Sensor
- Mass Airflow (MAF) Sensor
- Throttle Position (TP) Sensor
- Vehicle Speed Sensor (VSS)
- Switches
- Relays
- Fuel System
- Idle Control System
- Ignition System
- Emission Systems & Sub-Systems
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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.