RHAOCZIYAUTO Ignition Lock Switch Assembly for Kia Optima 2016-2020 — Complete Cylinder & Housing with 2 Keys

If your Optima's key won't turn, the ignition feels loose, or the vehicle has intermittent starting problems tied to the lock cylinder, this direct-fit assembly is designed as a straight replacement for several OEM part numbers. It includes the housing, cylinder, clamp, bolts, and two keys so you can swap the faulty unit without sourcing multiple components separately. Built from durable ABS plastic and reinforced metal parts, the assembly aims to withstand regular mechanical stress while matching the original factory dimensions for straightforward installation.

How does this assembly match my Kia Optima?

This unit is manufactured to replace the original ignition lock cylinder and housing on Kia Optima sedans from 2016 through 2020. It lists multiple OE cross-reference numbers so you can verify compatibility against the part you are replacing. The included hardware ensures you receive a complete kit rather than just the cylinder.

• Compatible model years: 2016, 2017, 2018, 2019, 2020
• Cross-replaces: 81900-D5B00, 81900-D5A00, 81905-D4120
• Also substitutes: 81991-35240, 81970-D4B00, 81250-D4A00
• Complete kit: housing, cylinder, clamp, bolts, two keys

What materials and build quality should I expect?

The assembly combines ABS plastic for the housing with metal internal components where strength and wear resistance are required. This mix keeps the part lightweight while protecting critical moving surfaces against deformation. The design focuses on longevity under normal vehicle use rather than cosmetic refinements.

• Housing: durable ABS plastic for impact resistance
• Internal components: hardened metal for wear resistance
• Fasteners: included bolts and clamp for secure installation
• Keys: two cut keys provided for immediate use

How difficult is installation and what’s included?

Installation is intended to be a direct swap with the factory assembly and can usually be completed with basic hand tools. The package provides the lock housing, lock cylinder, two bolts, a housing clamp, and two keys so no additional parts are typically necessary. For safety and alignment, follow vehicle-specific service instructions or consult a professional if unsure.

• Included parts: ignition lock housing, cylinder, clamp, 2 bolts, 2 keys
• Tools needed: basic hand tools (screwdrivers, ratchet set)
• Time estimate: typical DIY swap often under one hour
• Recommendation: reference Kia service manual for removal/installation steps

Who is this for: This assembly is intended for Kia Optima owners, mechanics, and independent repair shops needing a direct-fit replacement for a worn or damaged ignition lock. It's suited for situations where the original part numbers listed need replacing and for buyers who want a complete kit with keys included to minimize parts sourcing. If you require professional-grade calibration, or if your vehicle has advanced immobilizer or key programming beyond the physical cylinder, pair this part with proper key programming services for full vehicle security integration.