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.
Exhaust Gas Oxygen (O2) Sensor
O2 sensor is mounted in the exhaust manifold except on Sonata 3.0L, where it is mounted downstream in exhaust pipe. O2 sensor has a permanent pigtail which must be protected from damage when the sensor is removed. Ensure sensor is free of contaminants. DO NOT use any cleaning solvents.
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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.