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.
2012 Kia Optima L4-2.4LFACTORY OEM SERVICE PROCEDURE
System Specifications
Specifications
VFS: Variable Force Solenoid
Sensors
Input Speed Sensor
- Type: Hall effect sensor
- Specifications
Output Speed Sensor
- Type: Hall effect sensor
- Specifications
Oil Temperature Sensor
- Type: Negative thermal coefficient type
- Specifications
Inhibitor Switch
- Type: Combination of output signals from 4 terminals
- Specifications
Solenoid Valves
Direct control VFS[26/B, T/CON]
- Control type : Normal low type
Direct control VFS[UD/B, OD/C, 35R/C]
- Control Type : Normal high type
Line Pressure Control VFS
- Control type : Normal high type
ON/OFF Solenoid Valve(SS-A, SS-B)
- Control type : Normal low type
Solenoid Valve Operation Table
X : Connected status
x : Connected at vehicle speed above 8km/h
Tightening Torques
Lubricants
Sealant
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.