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What Year Kia Optima Parts Are Interchangeable?

What Year Kia Optima Parts Are Interchangeable?

If you are an enthusiast or owner of a Kia Optima, you will be curious about which parts can be used between its different model years. Interchangeable parts from other models or trim levels with better specifications can save you money and improve the performance of your car.

What Year Kia Optima Parts Are Interchangeable? You can interchange different parts of Kia Optima 2.4-liter I4 engine from 2010-2019 and the 1.6-liter turbocharged engine from 2021-2023. You can swap the seats for the 2001-2006, 2007-2010, 2011-2015, and 2016-2020 variants. Steering wheels are compatible with the 2011-2013, 2014-2015, and 2021-2022 model years of the sedan.

We will cover essential systems from engines to the body for all 5 generations of the car. We will also discuss the body shape changes and shared parts between Kia Optima and other Hyundai cars.

Kia Optima Interchangeable Parts

Kia Optima is a sedan available in the US market in 5 generations from 2001-present in multiple variants and trim levels. Most parts within the same generation model years are identical and compatible with adjacent models.

Engine parts

You can swap the complete engine assembly or parts between model years with the same drivetrain and powertrain specifications. Otherwise, it will cost you a lot of money to interchange an engine that never originally came with the car, even if it’s just another Kia engine.

The 2.4-liter I4 GDI theta II engine is available in 2010-2019 variants, and most of its parts are swappable. 2.7-liter V6 engine parts are interchangeable between 2006-2009.

The 1.6-liter Smartstream G1.6T (G4FP) engine is available in the 2021-present model years of Kia Optima/K5, and it has interchangeable parts, including a turbocharger in these years. You have to select these parts carefully as these can affect the number of miles it can cover with low gas.

You can also swap the same displacement size engine from hybrid variants of the car into non-hybrid variants. But you also have to interchange the ECU, wiring, and some other modifications.


ECUs from the 2001-2003 variants with similar engine types are interchangeable.

For replacing it with another car of the same year, it is a plug-and-play kind of arrangement. While swapping it from any other model year with compatible specifications, you have to reprogram it specifically in the latest variants with immobilizer features.

Other examples with compatible ECU are 2004-2006, 2007-2008, 2011-2013, and 2016-2018. Moreover, in case of a different engine swap, you also have to install the ECU taken from the source car.

Body parts

Body parts are compatible with same-generation models before and after the facelift introduced by KIA. You can swap most parts in 2001-2003, 2004-2006, 2007-2008, 2009-2010, 2011-2013, 2014-2015, 2016-2018, 2019-2020 and 2021-present model years.

However, there are a few exceptions regarding some specific parts. For example, you can interchange the hood for 2016-2020, bumper cover for 2016-2018, LED headlights for 2016-2018, and air intake duct for 2016-2020 for variants with 1.6-liter and 2.4-liter engines.

The 2014-2015 headlamps have different shapes and will not be compatible with the 2011-2013 model front bumper/grille.

You can also swap some parts between different trim levels within the same year. They have identical dimensions with diverse styling.

For example, you can interchange the front bumper and carbon fiber splitter in the 2011 Kia Optima between LX/EX and SX trim levels with a few modifications to install fender liners. 


You can swap the driver and passenger seats from model years within the same generation of Kia Optima, such as 2001-2006, 2007-2010, 2011-2015, and 2016-2020.

However, changes in seat dimensions, mounting brackets, and features like airbags and seat heaters can affect interchangeability between different generations and trim levels. For example, an LX trim or an EX/SX variant has separate wiring harnesses.

Moreover, they have memory seat buttons and the center console heated/cooling seat control. The number of power seat control adjustments, seat belts, and airbag positions differ between driver and front passenger seats.

Therefore, you have to do a lot of modification work if you swap between different trim levels or between passenger and driver seats.

However, the only thing you can easily change is the leather upholstery and foam cushions from higher-end trim levels like EX and SX in LX trim levels with fabric upholstery.

While back seats are comparatively easy to swap because no sensors or extra features are available in them.

Steering wheel

The steering wheels of Kia Optima are primarily specific for each or with adjacent model years. Therefore, you can replace it with the same model year if you want to avail all of its features.

However, a few pairs of compatible variants are 2011-2013, 2014-2015, and 2021-2022. You can install them mechanically from other model years, but their Body Control Module (BCM), wiring connectors, pedal shifters, and buttons will not be compatible.

Therefore, you must do a lot of modification work to avail yourself of most of their features. The same applies to swapping between different trim levels because of their upgraded interiors and additional features in high-end trims.

Suspension parts

Complete suspension parts are interchangeable within same-generation models. You can swap its front and rear parts between 2001-2006 for multiple engine variants and trim levels of the sedan.

Control arms, strut coil springs, shock absorbers, and lower suspension ball joints are compatible with 2007-2010, 2011-2013, and 2014-2015 variants.

4th and 5th generation variants of Kia Optima/K5 also have interchangeable suspension parts for 2016-2020 and 2021-2023 variants.

Transmission swap

Kia Optima has several transmissions available across different model years according to drivetrain configuration and engine type installed.

2000-2010 variants of the car have 4-speed automatic transmission compatible with 2.0-liter and 2.4-liter I4 and 2.5 and 2.7-liter V6 engines.

6-speed manual and automatic transmission are interchangeable with 2.0 and 2.4-liter I4 engines in 2011-2017 sedan models with front-wheel drive (FWD). The 7-speed DCT is compatible with the 1.6-liter I4 engine for 2015-2019 variants.

2021-present car models with 1.6-liter turbocharged and 2.5-liter naturally aspirated I4 engines have swappable parts of 8-speed automatic transmission. The 2.5-liter turbocharged engine is compatible with 8-speed DCT transmission in 5th-generation cars.

Axle shaft

Axle shaft interchangeability depends on the engine type and specific trim level of the Kia Optima. CV axle shaft assembly for driver and passenger sides are compatible with 2001-2006 variants of the car.

You can interchange between 2007-2010 models having 2.7-liter V6 engines. In the 3rd generation, 2011-2013 and 2014-2015 variants also have compatible CV axles.

You can swap it between the 2016-2020 variants of the sedan for LX, EX, and EX premium trim levels with 1.6-liter I4 turbocharged engines.

Side mirror

You can swap the side mirrors within the same generation model years of Kia Optima. 2001-2006 models of the car have compatible mirror dimensions for both the driver and passenger side.

You can also replace the power heated mirrors for the 2007-2010 vehicle variants. Other examples of compatible years are 2011-2016, 2017-2020, and 2021-2023.

Moreover, the latest year variants have carbon fiber construction and more advanced features like blind spot detection.

Therefore, you have to make wiring changes accordingly, and the same attributes will not be available if you install them in older sedan models.

Panoramic roof

Panoramic roof is a feature available in selective trim levels of Kia Optima since 2012. Therefore, you have to check its interchangeability for specific trim levels within the same year.

For the EX trim level, you can swap it between 2012-2019 and 2022-2023 model years. For SX and SX turbo trim levels, it is available in 2012-2020 models.

GT and GT line variants have it for 2021-2023 variants in the 5th generation of the car.

Besides the sunroof, you can interchange the rooftop molding assembly between adjacent years within the same generation after confirming their dimensions and mounting points. 


You can swap the turbocharger between model years of Kia Optima, having the same engine options, electronics to support it, and engine layout.

Some trim levels are available with turbocharged engine options, which are compatible for a few years.

The 2.0-liter I4 engine is available with a turbocharger for 2011-2015 variants, and you can swap between them. 2021-onwards variants for the US market have 1.6-liter and 2.5-liter turbocharged engines, and you can change parts between the same engine options.

If you choose to install in other model years with this option not available, it requires a lot of modification work and will not be economically feasible.

What year did the Kia Optima body style change?

The Kia Optima underwent significant body style changes in various model years, reflecting the evolution of its design. In 2007, the second-generation Optima showcased a more modern and streamlined appearance than its predecessor.

The third generation, introduced in 2011, took a bold step with a more aggressive and aerodynamic body style, featuring distinctive elements like angular headlights and an eye-catching front grille.

Continuing the trend, the fourth-generation Optima in 2016 displayed refined updates in its design, including LED lighting and sleeker front and rear fascias.

The year 2021 marked a notable transformation as the Kia Optima rebranded as the Kia K5 in the North American market.

The K5 introduced a futuristic and sporty body style, highlighted by its fastback-like roofline, striking front grille, and advanced lighting technology.

Moreover, there are also facelifts introduced by the manufacturer within the same generation for the 2004, 2009, 2014, and 2019 years, with some modifications in body styling and other features.

What parts of the KIA Optima are interchangeable with Hyundai cars?

Several parts of the Kia Optima are interchangeable with Hyundai cars due to their shared parent company and platform-sharing strategies. It includes various Hyundai models, such as the Hyundai Sonata, Santa Fe, Elantra, and Veloster.

For example, you can swap 2.0-liter I4 engines between the 2016-2019 Kia Optima, the 2017-2018 Hyundai Santa Fe, and the 2015-2019 model Hyundai Sonata. The closest match with the Kia Optima is the Hyundai Sonata.

You can swap the engine, suspension, and electronic parts between these cars. But, when it comes to the outside parts like bumpers and headlights, they have different dimensions and mounting bolts.

Interior Parts like steering wheels, gear levers, and pedals can be dissimilar in appearance, but they usually fit the same way and use the same connectors. Moreover, they also share the part numbers in some cases.

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