Kia Optima: Tire Speed Ratings

Wheel Size Designation

Wheels are also marked with important information that you need if you ever have to replace one. The following explains what the letters and numbers in the wheel size designation mean. Example wh ...

Uniform Tire Quality Grading

The following information relates to the tire grading system developed by the National Highway Traffic Safety Administration (NHTSA) for grading tires by tread wear, traction and temperature perfo ...

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Checking the brake/clutch* fluid level
Check the fluid level in the reservoir periodically. The fluid level should be between MAX and MIN marks on the side of the reservoir. Before removing the reservoir cap and adding brake/c ...

Noise and smoke
When the air bags inflate, they make a loud noise and they leave smoke and powder in the air inside of the vehicle. This is normal and is a result of the ignition of the air bag inflator. After th ...

ESC connector input/output
Connector Terminal Specification Remark No Description 29 IGNITION1(+) High level of wake up vol ...