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.
2018 Kia Optima Plug-In Hybrid EXFACTORY OEM SERVICE PROCEDURE
Engine Control System
ENGINE CONTROL SYSTEM TIGHTENING TORQUE SPECIFICATIONS
| Item | kgf.m | N.m | lb.ft |
|---|---|---|---|
| ECM mounting nut | 1.0 - 1.2 | 9.8 - 11.8 | 7.2 - 8.7 |
| ECM bracket mounting bolt/nut | 1.0 - 1.2 | 9.8 - 11.8 | 7.2 - 8.7 |
| Mass air flow sensor clamp mounting bolts | 0.3 - 0.5 | 2.9 - 4.9 | 2.2 - 3.6 |
| Mass air flow sensor mounting bolts | 0.3 - 0.5 | 2.9 - 4.9 | 2.2 - 3.6 |
| Manifold absolute pressure sensor mounting bolt | 1.0 - 1.2 | 9.8 - 11.8 | 7.2 - 8.7 |
| Engine Coolant Temperature Sensor | 3.0 - 4.0 | 29.4 - 39.2 | 21.7 - 28.9 |
| Crankshaft position sensor mounting bolt | 1.0 - 1.2 | 9.8 - 11.8 | 7.2 - 8.7 |
| Camshaft position sensor (Bank 1/Intake) mounting bolt | 1.0 - 1.2 | 9.8 - 11.8 | 7.2 - 8.7 |
| Camshaft position sensor (Bank 1/Exhaust) mounting bolt | 1.0 - 1.2 | 9.8 - 11.8 | 7.2 - 8.7 |
| Knock sensor mounting bolt | 1.9 - 2.4 | 18.6 - 23.5 | 13.7 - 17.4 |
| Heated oxygen sensor (Bank 1/sensor 1) mounting | 4.0 - 5.0 | 39.2 - 49.1 | 28.9 - 36.2 |
| Heated oxygen sensor (Bank 1/sensor 2) mounting | 4.0 - 5.0 | 39.2 - 49.1 | 28.9 - 36.2 |
| Rail pressure sensor | 3.0 - 3.6 | 30.0 - 35.0 | 22.1 - 25.8 |
| Electronic throttle body mounting bolt | 0.8 - 1.0 | 7.8 - 9.8 | 5.8 - 7.2 |
| Purge Control Solenoid Valve bracket mounting bolt | 1.0 - 1.2 | 9.8 - 11.8 | 7.2 - 8.7 |
| Electric EGR Control Valve mounting bolt | 1.0 - 1.2 | 9.8 - 11.8 | 7.2 - 8.7 |
| CVVT oil control valve (Bank 1/Intake) mounting bolt | 1.0 - 1.2 | 9.8 - 11.8 | 7.2 - 8.7 |
| CVVT oil control valve (Bank 1/Exhaust) mounting bolt | 1.0 - 1.2 | 9.8 - 11.8 | 7.2 - 8.7 |
| Ignition coil mounting bolt | 1.0 - 1.2 | 9.8 - 11.8 | 7.2 - 8.7 |
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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